The Engine Scan Tool Data Definitions contains a brief description of all engine
related parameters available on the scan tool. The list is in alphabetical order.
A given parameter may appear in any one of the data lists. In some cases, the parameter
may appear more than once or in more than one data list in order to group certain
related parameters together.
4WD Low Signal: This parameter displays the state of the transfer
case based on the signal from the four wheel drive (4WD) low switch. The scan tool
will display Enabled or Disabled. Enabled indicates the transfer case is in 4WD low
gear and the 4WD low switch is closed, completing the low signal circuit. Disabled
indicates the transfer case is not in 4WD low gear and the 4WD low switch is open.
4WD Signal: This parameter displays the state of the transfer
case based on the signal from the front axle indicator switch. The scan tool will
display Enabled or Disabled. Enabled indicates the front axle is locked in four wheel
drive and the front axle indicator switch is closed, supplying voltage to the controller
on the axle switch signal circuit. Disabled indicates the transfer case is not in
four wheel drive and the front axle indicator switch is open.
A/C Clutch Feed Back Signal: This parameter displays the state
of the air conditioning (A/C) compressor clutch based on the signal from the switched
side of the A/C clutch relay. The scan tool will display Relay On or Relay Off. Relay
On indicates the A/C clutch relay has closed, allowing voltage to the A/C compressor
clutch. Relay Off indicates the A/C clutch relay is open and the A/C compressor clutch
is not engaged.
A/C Compressor Cycling Switch: This parameter displays the state
of the air conditioning (A/C) compressor cycling switch as determined by the control
module. The scan tool will display Normal or Low Pressure. Normal indicates the A/C
system has enough refrigerant to close the A/C compressor cycling switch, allowing
the A/C compressor to engage. Low Pressure indicates the A/C refrigerant system has
low pressure and the A/C compressor cycling switch is open.
A/C Sec. High Pressure Switch: The scan tool displays High Pressure
or Normal. This parameter displays the state of the A/C secondary high pressure switch.
The A/C secondary high pressure switch is normally open.
A/C Relay Command: This parameter displays the commanded state
of the air conditioning (A/C) clutch relay control circuit. The scan tool will display
ON or OFF. ON indicates the A/C clutch relay control circuit is being grounded by
the control module, alllowing voltage to the A/C compressor clutch. OFF indicates
the A/C clutch relay is not being commanded on by the control module.
A/C Request Signal: This parameter displays the state of the
air conditioning (A/C) request input to the control module from the heating, ventilation,
and air conditioning (HVAC) controls. The scan tool will display Yes or No. Yes indicates
the control module is receiving a request from the HVAC system to ground the A/C clutch
relay control circuit, engaging the A/C compressor clutch. No indicates the control
module is not receiving a request from the HVAC system to ground the A/C clutch relay
control circuit.
AIR Relay Command: This parameter displays the commanded state
of the secondary air injection (AIR) pump relay control circuit. The scan tool will
display ON or OFF. ON indicates the AIR pump relay control circuit is being grounded
by the control module, allowing voltage to the AIR pump. OFF indicates the AIR pump
relay is not being commanded on by the control module.
APP Average: This parameter displays the average of the 3 accelerator
pedal position (APP) sensors as calculated by the throttle actuator control (TAC)
module. The APP average is a range of values indicating a low number when the accelerator
pedal is not depressed to a high number when the accelerator pedal is fully depressed.
This value is listed in counts.
APP Indicated Angle: This parameter displays the angle of the
accelerator pedal as calculated by the control module using the signals from the accelerator
pedal position sensors. The APP indicated angle is a range of values indicating a
low percentage when the accelerator pedal is not depressed to a high percentage when
the accelerator pedal is fully depressed.
APP Sensor 1: This parameter displays the angle of the accelerator
pedal position (APP) sensor 1 as calculated by the control module using the signal
from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage
when the accelerator pedal is not depressed to a high percentage when the accelerator
pedal is fully depressed.
APP Sensor 1: This parameter displays the voltage signal sent
to the control module from accelerator pedal position (APP) sensor 1 of the APP sensor
assembly. APP sensor 1 is a range of values indicating a low voltage when the accelerator
pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.
APP Sensor 1 and 2: This parameter displays the results of a
control module test that compares the signals from the accelerator pedal position
(APP) sensors 1 and 2 . The scan tool will display Agree or Disagree. Agree indicates
that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal
position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond
to different accelerator pedal positions.
APP Sensor 2: This parameter displays the angle of the accelerator
pedal position (APP) sensor 2 as calculated by the control module using the signal
from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage
when the accelerator pedal is not depressed to a high percentage when the accelerator
pedal is fully depressed.
APP Sensor 2: This parameter displays the voltage signal sent
to the control module from accelerator pedal position (APP) sensor 2 of the APP sensor
assembly. APP sensor 2 is a range of values indicating a low voltage when the accelerator
pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.
BARO: The scan tool displays a range of 10-105 kPa.
The barometric pressure (BARO) reading is determined from the manifold absolute pressure
(MAP) sensor signal. The powertrain control module (PCM) monitors the MAP signal during
key up or wide open throttle (WOT) conditions. The barometric pressure (BARO) compensates
for altitude differences.
CMP Sensor-High to Low: The scan tool displays 0-65,535 counts.
The counts increment as the powertrain control module (PCM) detects the camshaft position
(CMP) sensor signal voltage going from high to low.
CMP Sensor-Low to High: The scan tool displays 0-65,535 counts.
The counts increment as the powertrain control module (PCM) detects the camshaft position
(CMP) signal voltage going from low to high.
Cold Start Up: The scan tool displays Yes or No. A cold start-up
is when the engine coolant temperature (ECT) rises above a predetermined temperature
during an ignition cycle. The next ignition cycle the ECT should be below a predetermined
temperature. Also the ECT and the intake air temperature (IAT) are less than 50°C
(122°F) and are within 3°C (5°F) of each other at start-up. When the above
is true, the scan tool displays Yes.
Coolant Level Switch: The scan tool displays OK or Low. This
parameter indicates when the engine coolant level is low. The scan tool displays Low
when the powertrain control module (PCM) detects the engine coolant level is low.
Cruise Control Active: The scan tool displays Yes or No. When
the cruise control switch is ON and the set/coast switch is activated, the scan tool
displays yes. When the cruise control switch is ON and the set/coast switch is released,
the scan tool displays No.
Cruise Disengage 1-8 History: This parameter displays
the last 8 cruise control disengages in order from 1 to 8. The control module will
disengage the cruise control for up to 20 different conditions.
Cruise On/Off Switch: The scan tool displays ON or OFF. When
you activate the cruise control switch, the scan tool displays ON. The switch, when
in the ON position, sends a signal voltage to the throttle actuator control (TAC)
module. This allows all other functions of the cruise control. When you turn OFF the
cruise control switch, the scan tool displays OFF.
Cruise Release Brake Pedal Switch: This parameter displays the
state of the Cruise Release Brake Pedal Switch as determined by the control module.
The scan tool will display Released or Applied. Released indicates the brake pedal
is not being pushed down , allowing the cruise control to be enabled. Applied indicates
the brake switch is being applied, disabling cruise control operation.
Cruise Resume/Accel: The scan tool displays ON or OFF. When
the cruise control switch is in the ON position and the Resume/Accel switch is activated,
the scan tool displays ON. When the Resume/Accel switch is released, the scan tool
displays OFF.
Cruise Set/Coast: The scan tool displays ON or OFF. When the
cruise control switch is in the ON position and the Set/Coast switch is activated,
the scan tool displays ON. When the Set/Coast switch is released the scan tool displays
OFF.
Current Gear: The scan tool displays 0-4. The scan tool
displays which gear the transmission is in. An illegal transmission position displays
9.
Cycles of Misfire Data: The scan tool displays a range of 0-100.
The powertrain control module (PCM) counts the number of misfire tests during 200
engine revolutions.
Decel. Fuel Shutoff: The scan tool displays Active or Inactive.
The scan tool displays Active when the powertrain control module (PCM) shuts off fuel
flow through the fule injectors because of a deceleration condition.
Desired EGR Position : The scan tool displays 0-100 percent
. This parameter displays the desired position of the exhaust gas recirculation (EGR)
pintle as requested by the powertrain control module (PCM). This parameter should
be very close to actual EGR position.
Desired EGR Position: The scan tool displays 0-5 volts.
The commanded exhaust gas recirculation (EGR) is the EGR pintle position commanded
by the powertrain control module (PCM).
Desired Idle Speed: The scan tool displays a range of 0-3,187 RPM.
The powertrain control module (PCM) commands the desired idle speed. The PCM compensates
for various engine loads based on engine coolant temperature (ECT) in order to keep
the engine at the desired speed.
DTC Set This Ignition: The scan tool displays Yes or No. This
parameter indicates if a DTC set during the current ignition cycle.
ECT Sensor: The scan tool displays a range of -39 to +140°C
(-38 to +284°F). The powertrain control module (PCM) applies 5 volts
to the engine coolant temperature (ECT) sensor circuit. The sensor is a thermistor
which changes internal resistance as the engine temperature changes. When the sensor
is cold, internal resistance high, the PCM senses a high signal voltage and interprets
the voltage as a cold engine. As the sensor warms, internal resistance decreases,
the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
EGR Learned Minimum Position: . Represents the learned voltage
that the controller uses to determine whether or not the EGR valve is fully closed.
EGR Position Sensor: The scan tool displays 0-5 volts.
This parameter displays the actual exhaust gas recirculation (EGR) pintle position
in voltage.
EGR Position Sensor: The scan tool displays a range of 0-100 percent.
The powertrain control module (PCM) supplies a pulse width modulated (PWM) duty cycle
to control the exhaust gas recirculation (EGR) valve. Zero percent indicates no EGR
flow. One hundred percent indicates full EGR flow.
Engine Load: The scan tool displays a range of 0-100 percent
. The powertrain control module (PCM) calculates the engine load from engine speed
and mass airflow (MAF) sensor readings. The engine load increases with an increase
in RPM or airflow.
Engine Oil Level Switch: The scan tool displays OK or Low. This
parameter indicates when the engine oil level is low. The scan tool displays Low when
the powertrain control module (PCM) detects the engine oil level is low.
Engine Oil Life Remaining: The scan tool displays 0-100 percent
. This display represents the engine oil life index that is calculated and maintained
by the powertrain control module (PCM).
Engine Run Time: The scan tool displays Hours, Minutes and Seconds.
This displays the amount of engine run time for the current ignition cycle. When you
cycle the ignition OFF, the timer resets to zero.
Engine Speed: The scan tool displays a range of 0-10,000 RPM.
The powertrain control module (PCM) computes engine speed from the ignition reference
pulses. The engine speed should remain close to desired idle under various engine
loads with the engine idling.
EVAP Purge Solenoid Command: The scan tool displays a range
of 0-100 percent. The powertrain control module (PCM) supplies a pulse
width modulated (PWM) duty cycle to control the evaporative emission (EVAP) purge
solenoid valve. 0 percent indicates no purge. 100 percent indicates full purge.
EVAP Test Result: The scan tool displays if the evaporative
emission (EVAP) test has passed or failed. The scan tool displays pass when the powertrain
control module (PCM) determines that the EVAP diagnostic has passed. The scan tool
displays fail when the PCM determines that the EVAP diagnostic has failed.
EVAP Vent Solenoid Command: The scan tool displays Venting or
Not Venting. The evaporative emission (EVAP) canister vent valve is normally open.
The powertrain control module (PCM) commands the EVAP canister vent valve closed,
during testing of the EVAP system.
Fuel Level Sensor: The scan tool displays 0-5 volts.
The scan tool displays below 1 volt for an empty tank, and close to 2.5 volts
for a full tank.
Fuel Level Sensor Rear Tank: The scan tool displays 0-5 volts.
The scan tool displays below 1 volt for an empty tank, and close to 2.5 volts
for a full tank.
Fuel Tank Level Remaining: The scan tool displays in liters
or gallons the amount of fuel remaining in the fuel tank.
Fuel Tank Level Remaining: The scan tool displays 0-100 percent.
The scan tool displays in percentage the amount of fuel remaining in the fuel tank.
Fuel Tank Pressure Sensor: The scan tool displays -32.7
to +13.96 mm/Hg (-17.4 to +7.5 in H2O. This parameter indicates the pressure
vacuum inside of the fuel tank. A negative value indicates a vacuum. A positive value
indicates a pressure.
Fuel Tank Pressure Sensor: The scan tool displays 0-5 volts.
The scan tool displays in voltage the pressure inside of the fuel tank.
Fuel Tank Rated Capacity: The scan tool displays the capacity
of the fuel tank in liters or gallons.
Fuel Trim Cell: The scan tool displays a range of 0-23.
The powertrain control module (PCM) determines from the manifold absolute pressure
(MAP) and RPM inputs which fuel trim cell to operate the engine in. The fuel trim
cell displayed on the scan tool is the cell that the engine is operating under.
Fuel Trim Learn: The scan tool displays Enabled or Disabled.
When conditions are appropriate for enabling long term fuel trim corrections, the
scan tool displays Enabled. This indicates that the long term fuel trim is responding
to the short term fuel trim. If the scan tool displays Disabled, then long term fuel
trim will not respond to changes in Short Term fuel trim.
Generator F Terminal Signal Command: The scan tool displays
0-100 percent. The display shows generator F terminal duty cycle in percent
from 0-100 percent. The generator is able to produce the desired voltage
by varying the duty cycle of the field current.
Generator L Terminal Signal Command: The scan tool displays
ON or OFF. The scan tool displays OFF if the powertrain control module (PCM) does
not detect a correct voltage on the L-terminal circuit. The scan tool displays ON
under normal operating conditions.
HO2S Bank 1 Sensor 1: The scan tool displays a range of 0-1,106 mV.
The heated oxygen sensor (HO2S) bank 1 sensor 1 parameter represents the fuel control
exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range
between 10-1,000 mV, while operating in Closed Loop.
HO2S Bank 1 Sensor 2: The scan tool displays a range of 0-1,106 mV.
The heated oxygen sensor (HO2S) bank 1 sensor 2 parameter represents the fuel control
exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range
between 10-1,000 mV, while operating in Closed Loop.
HO2S Bank 2 Sensor 1: The scan tool displays a range of 0-1,106 mV.
The heated oxygen sensor (HO2S) bank 2 sensor 1 parameter represents the exhaust oxygen
sensor output voltage. The voltage fluctuates constantly within a range between 10-1,000 mV,
while operating in Closed Loop.
HO2S Bank 2 Sensor 2: The scan tool displays a range of 0-1,106 mV.
The heated oxygen sensor (HO2S) bank 2 sensor 2 parameter represents the fuel control
exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range
between 10-1,000 mV, while operating in Closed Loop.
HO2S Heater Bn 1 Sen. 1: This parameter displays the current
through the control module when the bank 1 sensor 1 HO2S heater is commanded ON by
the control module. HO2S Heater Bn 1 Sen. 1 is a range of values indicating a low
current when the heater circuit resistance is high to a high current when the heater
circuit resistance is low.
HO2S Heater Bn 1 Sen. 2: This parameter displays the current
through the control module when the bank 1 sensor 2 HO2S heater is commanded ON by
the control module. HO2S Heater Bn 1 Sen. 2 is a range of values indicating a low
current when the heater circuit resistance is high to a high current when the heater
circuit resistance is low.
HO2S Heater Bn 2 Sen. 1: This parameter displays the current
through the control module when the bank 2 sensor 1 HO2S heater is commanded ON by
the control module. HO2S Heater Bn 2 Sen. 1 is a range of values indicating a low
current when the heater circuit resistance is high to a high current when the heater
circuit resistance is low.
HO2S Heater Bn 2 Sen. 2: This parameter displays the current
through the control module when the bank 2 sensor 2 HO2S heater is commanded ON by
the control module. HO2S Heater Bn 2 Sen. 2 is a range of values indicating a low
current when the heater circuit resistance is high to a high current when the heater
circuit resistance is low.
IAT Sensor: The scan tool displays a range of -39 to +140°C
(-38 to +284°F). The powertrain control module (PCM) converts the resistance
of the intake air temperature (IAT) sensor to degrees. The PCM uses the IAT in order
to adjust fuel delivery and spark timing according to incoming air density.
Ignition 1 Signal: The scan tool displays 0-25.5 volts.
The ignition 1 represents the system voltage measured by the powertrain control
module (PCM) at the ignition feed circuit.
Inj. PWM Average Bank 1 and Bank 2: The scan tool displays a
range of 0-1,000 milliseconds. The injector average indicates the amount
of time the powertrain control module (PCM) commands each injector ON during each
engine cycle. A longer injector pulse width causes more fuel to be delivered. The
injector pulse width increases with an increased engine load.
Knock Retard: The scan tool displays a range of 0.0-16 degrees.
Knock retard indicates the amount of spark the powertrain control module (PCM) removes
from the ignition control (IC) spark advance in response to the signal from the knock
sensors (KS).
Long Term FT Avg. Bn1 and Bn2: The scan tool displays percentage.
This parameter indicates the average of all long term fuel trim cells. The short term
fuel trim cells are rated, for the amount of which they are used. For example, an
idle cell is rated higher than a wide open cell. If a fueling malfunction occurs in
the idle cell and the wide open cell, the average would be more affected by the idle
cell than the wide open cell. A negative value significantly below 0 percent
indicates that the fuel system is rich and fuel delivery is being reduced. A positive
value significantly more than 0 percent indicates that a lean condition exists
and the powertrain control module (PCM) compensates by adding fuel. When the average
of the cells reach a predetermined high or low, a fuel trim DTC sets.
Long Term FT Bank 1 and Bank 2: The scan tool displays percentage.
The powertrain control module (PCM) derives the long term fuel trim from the short
term fuel trim value. The long term fuel trim represents a long term correction of
fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation
in order to maintain the PCM commanded air/fuel ratio. A negative value significantly
below 0 percent indicates that the fuel system is rich and the PCM is reducing the
fuel delivery. A positive value significantly more than 0 percent indicates that a
lean condition exists and the PCM compensates by adding fuel. Fuel trim values at
maximum authority indicates an excessively rich or lean system.
Loop Status: The scan tool displays Open or Closed. Closed Loop
indicates that the powertrain control module (PCM) is controlling fuel delivery according
to oxygen sensor (HO2S) voltage. In Open Loop, the PCM ignores the HO2S voltage and
bases the amount of fuel to be delivered on throttle position (TP) sensor, engine
coolant, and mass air flow (MAF) sensor inputs only.
Low Oil Lamp Command: The scan tool displays ON or OFF. The
scan tool displays On when the powertrain control module (PCM) detects that there
is a low oil level condition. The low oil lamp is then commanded ON by the PCM.
MAF Sensor: The scan tool displays a range of 0-655 g/s.
The mass air flow (MAF) is the MAF input frequency converted to grams of air per second.
This indicates the amount of air entering the engine.
MAF Sensor: The scan tool displays a range of 0-31,999 Hz.
The mass air flow (MAF) sensor is a hot wire type air flow sensor. The powertrain
control module (PCM) converts current draw needed by the MAF to keep the hot wires
at a constant into a frequency signal. The scan tool displays this frequency in a
hertz signal.
MAP Sensor: Scan Tool Range 10-105 kPa/0-5 volts.
The manifold absolute pressure (MAP) sensor measures the change in the intake manifold
pressure from engine load, and speed changes. As intake manifold pressure increases,
the intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading.
The powertrain control module (PCM) uses the MAP sensor signal for updating the barometric
pressure (BARO) reading and as an enabling factor for several of the diagnostics.
MIL Command: The scan tool displays On or Off. The scan tool
indicates if the powertrain control module (PCM) has commanded the MIL ON.
Mileage Since DTC Cleared: The scan tool displays Kilometers
or Miles. This parameter indicates the distance traveled since an emission DTC cleared.
The powertrain control module (PCM) stores this information in the Freeze Frame/Failure
Records memory.
Misfire Current Cyl. #1 - #8: The scan tool displays a
range of 0-255 counts. The misfire current counters increment at a rate
according to the number of possible misfires the powertrain control module (PCM) detects
on each cylinder during the last 200 cylinder firing events. The counters may
normally display some activity, but the activity should be nearly equal for all the
cylinders.
Misfire History Cyl. #1 - #8: The scan tool displays a
range of 0-65,535 counts. The misfire history counters display the total
level of misfire that has been detected on each cylinder. The misfire history counters
will not update or show any activity until a misfire DTC P0300 has become active.
The misfire history counters will update every 200 cylinder firing events.
PCM Reset: The scan tool displays Yes or No. This parameter
indicates when the internal powertrain control module (PCM) resets. The scan tool
displays YES when an internal PCM reset occurred. The scan tool displays NO under
the normal operating conditions.
PCM/VCM in VTD Fail Enable: The powertrain control module (PCM)
displays Yes or No. The scan tool displays Yes if the body control module (BCM) and
the PCM lose communications with each other after the BCM sends the correct password.
The scan tool displays No if the BCM is communicating the correct password to the
PCM.
PNP Switch: The scan tool displays Park/Neutral / In Gear
This parameter indicates the range selection of automatic transmission equipped
vehicles. The parameter will display Park/Neutral for the Park or Neutral position
of the gear selector. The parameter will display In Gear for the Reverse, Drive,
or Low positions of the gear selector.
Power Enrichment: The scan tool displays YES or NO. Yes indicates
that the powertrain control module (PCM) has detected conditions appropriate to operate
in Power Enrichment mode. The PCM will command Power Enrichment mode when a large
increase in throttle position and load is detected. While in Power Enrichment, the
PCM will increase the amount of fuel delivered by entering Open Loop and increasing
the injector pulse width. This is done to prevent a possible sag or hesitation from
occurring during acceleration.
Power Take Off (PTO) Enable: The scan tool displays YES or NO.
Yes indicates that the power take off (PTO) has been engaged and No indicates that
the PTO has been disengaged.
Reduced Engine Power: The scan tool displays Active or Inactive.
The scan tool displays Active when the powertrain control module (PCM) receives a
signal from the throttle actuator control (TAC) module that a TAC system fault is
occurring. The PCM limits the engine power.
Short Term FT Avg. Bn1 and Bn2: The scan tool displays percentage.
This parameter indicates the average of the short term fuel trim cells. The short
term fuel trim cells are rated for the amount of which they are used. For example,
the powertrain control module (PCM) rates an idle cell higher than a wide open cell.
If a fueling malfunction occurs in the idle cell and the wide open cell, the idle
cell would affect more than the wide open cell. A negative value significantly below
0 percent indicates that the fuel system is rich and the PCM is reducing the fuel
delivery. A positive value significantly more than 0 percent indicates that a lean
condition exists and the PCM is compensating by adding fuel. When the average of the
cells reach a predetermined high or low, a fuel trim DTC sets.
Short Term FT Bank 1 and Bank 2: The scan tool displays percentage.
The short term fuel trim represents a short term correction to fuel delivery by the
powertrain control module (PCM) in response to the amount of time the fuel control
oxygen sensor voltage spends above or below the 450 mV threshold. If the O2S
voltage mainly remains less than 450 mV, indicating a lean air/fuel mixture,
short term fuel trim increases into the positive range above 0 percent. The
PCM adds fuel. If the O2S voltage stays mainly above the threshold, the short term
fuel trim decreases below 0 percent into the negative range. The PCM reduces
the fuel delivery in order to compensate for the indicated rich condition. Under certain
conditions such as an extended idle and a high ambient temperature, the canister purge
may cause the short term fuel trim to read in the negative range during normal operation.
The fuel trim values at maximum authority may indicate an excessively rich or lean
system.
Spark: The scan tool displays a range of -64 to +64 degrees.
The scan tool displays the amount of degrees the powertrain control module (PCM) commands
the spark advance on the ignition control (IC) circuit. The PCM computes the desired
spark advance using the following: (1) ECT, (2) Engine speed (RPM), (3) Load, (4)
Vehicle speed. The PCM adjusts the timing.
Start Up ECT: The scan tool displays a range of -39 to
+140°C (-38 to +284°F). The scan tool displays the engine coolant temperature
(ECT) at the time the engine was started. The powertrain control module (PCM) uses
start-up ECT for certain DTCs.
Stop Lamp Pedal Switch: The scan tool displays Applied or Released.
This parameter indicates the state of the brake switch circuit input. The scan tool
displays Applied when you apply the vehicle brakes. The scan tool displays Released
when you release the vehicle brakes.
TAC/PCM Communication Signal: The scan tool displays OK or Fault.
If the communication between the throttle actuator control (TAC) module and the powertrain
control module (PCM) is interrupted the scan tool displays Fault. The scan tool displays
OK under the normal operating conditions.
TCC Brake Pedal Switch: The scan tool displays Applied or Released.
This parameter indicates the state of the (TCC/CC) brake switch circuit input. Open
indicates 0 voltage input, brake switch open, brake pedal applied. Closed indicates
a B+ voltage input, brake switch closed, brake pedal released. When you apply the
vehicle brakes, the scan tool displays Applied. The TCC and cruise control disengages.
When you release the vehicle brakes, the scan tool displays Released. This allows
the cruise control to be resumed and the torque converter clutch to engage.
TCC Enable Solenoid Command: The scan tool displays Enabled
or Disabled. The scan tool displays Enabled when the electrical system supplies a
voltage to the TCC enable solenoid .
TCC PWM Solenoid Command: The scan tool displays 0-100 percent.
This parameter is the commanded state of the torque converter clutch (TCC) pulse width
modulated (PWM) solenoid. The scan tool displays 100 percent when the commanded
state of the solenoid is ON. The scan tool displays 0 percent when the solenoid
is OFF.
TFP Sw.: The scan tool displays Park/Neutral, Reverse, Drive
4, Drive 3, Drive 2, or Low. Trans range represents the decoded status of the four
inputs from the transmission internal mode switch assembly. The combination of the
transmission inputs indicates the position of the transmission manual valve.
TP Desired Angle: The scan tool displays 0-100 percent.
The powertrain control module (PCM) indicates the desired throttle angle commanded
by the vehicle operator.
TP Indicated Angle: The scan tool displays 0-100 percent.
The TP indicated angle displays in percentage the amount of throttle opening.
TP Sensor 1: The scan tool displays 0-100 percent.
The scan tool displays the amount of throttle opening in percentage. Closed throttle
displays 0 percent and wide open throttle (WOT) displays near 100 percent.
TP Sensor 1: The scan tool displays 0-5 volts.
The scan tool displays the amount of throttle opening in volts. Closed throttle displays
about 1 volt and wide open throttle (WOT) displays above 3.5 volts.
TP Sensor 2: The scan tool displays 0-100 percent.
The scan tool displays the amount of throttle opening in percentage. Closed throttle
displays 0 percent and wide open throttle (WOT) displays near 100 percent.
TP Sensor 2: The scan tool displays 5-0 volts.
The scan tool displays the amount of throttle opening in volts. Closed throttle displays
about 4 volts and wide open throttle (WOT) displays below 1.5 volts.
TP Sensors 1 and 2: The scan tool displays Agree or Disagree.
When the throttle actuator control (TAC) module receives a signal voltage from one
of the throttle position sensors not in proper relationship to the other, the scan
tool displays Disagree. The scan tool displays No under normal operating conditions.
TR Switch: The scan tool displays the transmission gear position.
Vehicle Speed Sensor: The scan tool displays km/h and mph. The
vehicle speed sensor (VSS) signal is converted into km/h and mph for display on the
scan tool.
VTD Auto Learn Timer: The scan tool displays Active/Inactive.
The auto learn timer is the indication if the vehicle theft deterrent (VTD) system
is in the learn mode and has not timed out.
VTD Fuel Disabled: The scan tool displays Active/Inactive. If
the powertrain control module (PCM) has not received the correct password from the
body control module (BCM), the PCM disables the fuel system and the scan tool displays
Active. The scan tool displays Inactive under normal operating conditions.
VTD Fuel Disable Until Ignition Off: The scan tool displays
Yes or No. With the ignition ON and a vehicle theft deterrent (VTD) code present,
the scan tool displays Yes.
Warm Ups w/o Emission Faults: The scan tool displays a range
of 0-255. This parameter counts the number of warm up cycles without an emission
fault present. The counter increments to 255 and rolls back to 0 unless a fault occurs.
If a fault occurs, the counter reverts back to 0 until the fault is corrected. Clearing
the information with a scan tool or a loss of power to the powertrain control module
(PCM) also resets the counter to 0.
Warm Ups w/o Non - Emission Faults: The scan tool displays
a range of 0-255. This parameter counts the number of warm up cycles without
a non-emission fault present. The counter increments to 255 and rolls back to 0 unless
a fault occurs. If a fault occurs, the counter reverts back to 0 until the fault is
corrected. Clearing information with a scan tool or a loss of power to the powertrain
control module (PCM) also resets the counter to 0.