TCC Enable
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| • | The PCM commands the TCC enable solenoid valve ON and OFF. The
scan tool TCC Enable parameter should match the commanded state. |
| • | 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. |
| • | When the engine is running, the following control limits apply: |
| - | If the transmission range is Park or Neutral, the TCC enable solenoid
may not be commanded OFF for more than a calibrated amount of time. If the
solenoid is commanded OFF for a certain amount of time, the message "Engine
running and TCC commanded off and off time exceeding acceptable time limit"
appears on the scan tool display. |
| - | If the transmission range is Park or Neutral and the TCC control
solenoid duty cycle is less than maximum capacity, the TCC enable solenoid
may not be commanded ON. If the solenoid is requested ON during these conditions,
the message "Engine running, enable solenoid on. Control solenoid not
set to maximum capacity" appears on the scan tool display. |
| - | If the vehicle speed in third gear is greater than a calibrated
value, the TCC enable solenoid may not be commanded OFF for more than a calibrated
amount of time. If the solenoid is commanded OFF, and the vehicle speed is
too high for a certain amount of time, the message "Engine running and
TCC commanded off and off time exceeding acceptable time limit" appears
on the scan tool display. |
| - | If the vehicle speed in third gear is greater than a calibrated
value, and the TCC control solenoid duty cycle is less than maximum capacity,
the TCC enable solenoid may not be commanded ON for more than a calibrated
amount of time. If the solenoid is commanded ON during these conditions for
a certain amount of time, the message "Engine running, enable solenoid
on. Control solenoid not set to maximum capacity" appears on the scan
tool display. |
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