Scan Tool Data Definitions Cruise Control

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 1 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.

APP Average: The scan tool displays 0-125 counts. The TAC Module takes the voltages from the 3 APP Sensors, averages the readings and converts the readings into counts. The scan tool displays the average. The average is different on every vehicle.

APP Indicated Angle: The scan tool displays 0-100 percent. The scan tool displays the Accelerator Pedal Position in percentage. When the APP is at rest, the display shows 0 percent. When the APP is fully depressed, the display shows 100 percent.

Cruise Applied: The scan tool displays Yes or No. When the cruise control switch is in the on position and the Set/Coast switch is activated the scan tool displays YES. When the cruise control switch is in the ON position and the Set/Coast switch is released the scan tool displays NO.

CC Brake Switch: The scan tool displays Applied or Released (manual transmission). This parameter indicates the state of the TCC/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 torque converter clutch 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.

Clutch Switch: The scan tool displays Applied or Released. When the vehicle clutch pedal is pressed the scan tool display shows Applied, and the cruise control will disengage. When the vehicle clutch pedal is released, the scan tool displays Released, and the cruise control can be resumed.

Cruise Inhibit Signal Command: Displays On and OFF. The scan tool indicates if the PCM is commanding the cruise control module to inhibit cruise control operation.

Cruise Disengage History 1-6: The Scan tool displays the last 6 cruise control disengages in order from 1-6. There are 20 possible causes for the cruise control to disengage.

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 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.

Engine Load: Scan tool displays 0-100 percent. Engine load is calculated by the PCM from the engine speed and MAF sensor readings. Engine load should increase with an increase in RPM and air flow.

Engine Run Time: Scan tool displays 00:00:00 to 99:99:99 Hrs:Min:Sec. Indicates the time elapsed since the engine was started. If the engine was stopped, ENGINE RUN TIME will be reset to 00:00:00.

Engine Speed: Scan tool displays 0-9,999 RPM. Engine speed is computed by the PCM from the 3X reference input. It should remain close to the desired idle under various engine loads with engine idling.

Extended Travel Brake Switch: The scan tool displays Applied or Released. This parameter indicates the state of the extended travel brake switch. This switch is normally closed with the brake pedal released. Scan tool displays Released with the brake pedal released. Scan tool displays Applied with the brake pedal applied approximately greater than 40 percent.

Ignition 1 Signal: The scan tool displays 0-25.5 volts. Represents the system voltage measured by the PCM at its ignition feed.

PRND Position: The scan tool displays which position the gear shift lever is in.

Reduced Engine Power: The scan tool displays Active or Inactive. The scan tool displays Active when the PCM receives a signal from the TAC module that a throttle actuator control system fault is occurring. The PCM limits the engine power.

Stop Lamp Switch: The scan tool displays Applied or Released. When the brake pedal is pressed, the scan tool displays applied and the stop lamps go on. When the brake pedal is at rest, the scan tool displays Released and the stop lamps go off.

TAC/PCM Communication: The scan tool displays OK or Fault. If the communication between the TAC Module and the PCM is interrupted the scan tool displays Fault. The scan tool displays OK under the normal operating conditions.

TCC/CC Brake Switch: The scan tool displays Applied or Released. This parameter indicates the state of the TCC/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 torque converter clutch 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: The scan tool displays Enabled or Disabled. When the PCM applies a voltage to the TCC Enable solenoid the scan tool displays Enabled.

TP Desired Angle: The scan tool displays 0-100 percent. The 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.

Traction Control: The scan tool displays Active or Inactive, if equipped. The scan tool displays active if the PCM receives a signal from the Electronic Brake and Traction Control Module (EBTCM) requesting torque reduction during a traction control maneuver.

Transmission Range: Scan tool displays the transmission gear position.

Vehicle Speed: The scan tool displays km/h and mph. The vehicle speed sensor signal is converted into km/h and mph for display.

Scan Tool Data Definitions Disengage History

Accel (Acceleration) Rate: The vehicle acceleration is greater than the expected acceleration rate which is calculated by the PCM.

Brake Switches: The TAC module detects one of the brake switches active (TCC Brake Switch/Cruise Control Brake Switch or Stop Lamp Switch).

CC (Cruise Control) Switch Position: The TAC module will not allow cruise with the current position of the cruise switches.

Clutch Switch: The TAC module detects the clutch switch active.

Coast Speed Low: The Set/Coast switch is pushed and held until vehicle speed drops below 32 km/h (20 mph). Vehicle speed below 32 km/h (20 mph) will disable the cruise system.

Cruise Off: The TAC module does not detect that the cruise enable switch is active.

Decel (Deceleration) Rate: The vehicle deceleration is greater than the expected deceleration rate which is calculated by the PCM.

High Speed: The PCM detects that the vehicle speed is greater than 265 km/h (165 mph).

Low Speed: The PCM detects that the vehicle speed is less than 39 km/h (24 mph) when cruise enable is attempted.

No History: The No History parameter is displayed when a battery disconnect occurs.

Over Set Speed: The TAC module detects that the vehicle speed is greater than the cruise memory speed by more than a predetermined amount or, the vehicle speed is greater than a predetermined value during a transient maneuver, such as, Resume, Accel, Tap-up or Tap-downs, etc.

Pedal Initialization: The PCM does not detect the brake or clutch switches active during an ignition cycle.

S/C On-Speed High: This parameter is displayed when the Set/Coast switch is applied (tap down vehicle speed) and the vehicle speed is greater than the cruise memory speed by more than a predetermined value. For example, if the cruise control system is set to maintain a vehicle speed of 48 km/h (30 mph) then the vehicle is accelerated to 80 km/h (50 mph) and you press the Set/Coast again, the S/C On-Speed High message appears in the Cruise Control Disengage History.

S/C (Set/Coast) On, CC (Cruise Control) Off: The TAC module detects the Cruise Set/Coast signal is ON. When the switch is pushed (Cruise Coast Mode), this parameter will be displayed. If a fault is present with the Cruise Set/Coast signal circuit, this parameter will be displayed.

PCM Error: An internal PCM fault is detected.

PCM Inhibit: The PCM detects one of the following conditions:

TAC Inhibit: The TAC module has detected that an Electronic Throttle Control fault is active.

Traction Loss: The TAC module detects the vehicle is in a Traction Control event.

Two CC Commands: The TAC module detects the Set/Coast and Resume/Accel switches are active at the same time.

Under Set Speed: The TAC module detects that the vehicle speed is less than the cruise memory speed by more than a predetermined amount or, the vehicle speed is less than a predetermined value during a transient maneuver, such as, Resume, Accel, Tap-up or Tap-downs, etc.