Scan Tool Output Control
| Additional Menu Selections
| Description
|
TCC PC Solenoid
| TCC PC Sol. Electrical
|
| • | The PCM commands the duty cycle of the TCC pressure control solenoid.
The duty cycle is represented by a percentage of ON, energized, time. Approximately
90-100 percent duty cycle represents an ON, energized, commanded state. Zero
percent represents an OFF, non-energized, commanded state. The scan tool TCC
PC Sol. Duty Cycle parameter should match the commanded state. |
| • | The TCC PC Sol. Electrical output control can be performed when the ignition
is ON, and the engine is OFF. There are no limits to this control. The solenoid remains
ON, 90-100 percent duty cycle, until commanded OFF, zero percent duty cycle,
and vice versa. When the output control is exited, the solenoid duty cycle is determined
by the PCM. |
| • | The TCC PC Sol. Electrical output control is not allowed when the engine
is running. When the engine is running "Output control not allowed while engine is
running" is displayed. |
|
TCC PC Sol. Functional
| The PCM performs an automated functional test of the TCC pressure control solenoid.
In order to perform the test, the engine must be running at normal operating temperature
and the gear selector must be in Low range with the brakes applied. If any of these
conditions are not met during the test, the test will be aborted.
|
TCC Enable Solenoid
| --
|
| • | The PCM commands the TCC enable solenoid valve ON and OFF. The scan tool
TCC Enable Solenoid parameter should match the commanded state. |
| • | The TCC Enable Sol. Functional output control can be performed when the
engine is running. The following control limits apply: |
| - | The TCC enable solenoid may not be commanded ON, if the engine speed is
below a calibrated value. If the solenoid is commanded ON, when the engine speed is
too low, the message "Engine speed too low" appears on the scan tool display. |
| - | The TCC enable solenoid may not be commanded ON, if the vehicle speed
is below a calibrated value. If the solenoid is commanded ON, when the vehicle speed
is too low, the message "Vehicle speed too low" appears on the scan tool display. |
| - | The TCC enable solenoid may not be commanded ON, if the engine is not
running. If the solenoid is commanded ON, when the engine is not running, the message
"Engine speed not detected" appears on the scan tool display. |
|
Shift Solenoid
| Shift Solenoid 1
|
| • | The PCM commands the 1, 2 and 3 shift solenoid valves ON and OFF. |
| • | When the ignition is ON, and the engine is OFF, there are no limits to
this control. The solenoid remains ON until commanded OFF, and vice versa. When the
output control is exited, the solenoid state is determined by the PCM. |
| • | The shift solenoid output control is not allowed when the engine is running.
When the engine is running "Output control not allowed while engine is running" is
displayed. |
|
Shift Solenoid 2
|
Shift Solenoid 3
|
Shift Transmission
| --
| The PCM commands upshifts and downshifts. The scan tool Commanded Gear parameter
should match the commanded state. When the engine is running and the transmission
is in D, there are no limits to this control. The scan tool shift solenoid states
change to match the Commanded Gear selected. When the engine is running, the following
control limits apply:
| • | The PCM does not allow a shift if it will cause the engine RPM to exceed
a calibrated limit. If a gear is requested and the engine speed is too high, the message
"Engine speed too high" appears on the scan tool display. |
| • | The PCM does not allow a 3-2 or 2-1 downshift if the vehicle
speed exceeds a calibrated limit. If either downshift is requested and the vehicle
speed is too high, the message "Vehicle speed too high" appears on the scan tool display. |
| • | The PCM does not allow a 4-3 downshift if the vehicle speed exceeds
a calibrated limit. If a 4-3 downshift is requested and the vehicle speed is
too high, the message "Vehicle speed too high" appears on the scan tool display. |
| • | The PCM does not allow an upshift if the vehicle speed exceeds a calibrated
limit. If an upshift is requested and the vehicle speed is too high, the message "Vehicle
speed too high" appears on the scan tool display. |
|
Clutch PC Sol. 1
| Electrical
|
| • | The PCM commands the amperage, current, to the clutch pressure control
solenoid in order to control clutch apply/release pressure. As the amperage increases,
the pressure decreases. As the amperage decreases, the pressure increases. The amperage
range is 0.00-1.10 and may be commanded in one-tenth amp increments. |
| • | When the ignition is ON, and the engine is OFF, the reference, commanded,
amperage may be controlled within calibrated limits. The scan tool parameter "Clutch
PC Sol. Ref. Current" changes, but the parameter "Clutch PC Sol. Actual Current" does
not change. The reference current remains until commanded otherwise. |
| • | When the engine is running, the following control limits apply: |
| - | When the transmission range is PARK or NEUTRAL, the reference, commanded,
amperage may be controlled within calibrated limits. The engine speed must be less
than 1,500 RPM. If the engine speed is greater than 1,500 RPM, the message "TR in
park/neutral and engine speed over 1,500 RPM" appears on the scan tool display. Both
the scan tool parameters "Clutch PC Sol. Ref. Current" and "Clutch PC Sol. Actual
Current" change. Both current readings remain until commanded otherwise. |
| - | When the transmission range is not PARK or NEUTRAL, the reference amperage
can only be controlled less than the current determined by the PCM. The PCM does
not allow a value to be selected that may cause damage to the transmission. If the
requested amperage is more than allowed by the PCM, the message "Requested current
for the Clutch PC Solenoid is too high" appears on the scan tool display. |
|
Clutch PC Sol. 2
|
Clutch PC Sol. 1
| Functional
|
| • | The PCM performs an automated functional test of the clutch pressure control
solenoid. |
| • | In order to perform the test, the engine must be running at normal operating
temperature and the gear selector must be in DRIVE range with the brakes applied.
If any of these conditions are not met during the test, the test will be aborted. |
| • | Transmission range DTCs must not be active. If a transmission range DTC
is active, the message "Engine running with transmission DTC present" appears on the
scan tool display. |
| • | The transmission must be in DRIVE. If the transmission is not in DRIVE,
the message "Transmission must be in drive" appears on the scan tool display. |
| • | The brake pedal must be applied. If the brake pedal is not applied, the
message "Brake pedal must be applied" appears on the scan tool display. |
|
Clutch PC Sol. 2
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