Set Condition:

Set condition: 

P0124 - Throttle angle change > 5° in 7 milliseconds the Fault set time milliseconds 0.448 seconds

P0122 - Throttle angle < 6° the Fault Set Time: 0.448 seconds

P0123 - Throttle angle > 120.6° the Fault Set Time: 0.448 seconds

Theory of operation:  The transmission controller receives the throttle position signal and its ground from the Throttle Position Sensor (TPS). The TPS has a 5 volt pull up supplied by the engine controller. The throttle signal is checked for out-of-range as well as intermittent operation (excessive signal changes). The engine controller transmits the throttle value via the Bus. Most engine controllers can synthesize the throttle value if the throttle position sensor signal is lost. If a throttle error is detected by the transmission controller and the throttle value is available via the Bus, the Bus throttle value will be used and normal operation will continue, however a throttle fault code will be set. If a throttle error is detected and the throttle value is not available via the Bus, normal operation will be discontinued, a throttle fault code will be set, and the MIL will be turned on after 5 min. of substituted operation.

Transmission Effects: 

• If throttle value is available via the Bus - No effect.
• If throttle value is not available via the Bus

  A default throttle value is used.

  Torque converter lock-up inhibited.

  4th gear inhibited.

  Limited shift schedule.

  MIL on after 5 min. of substituted operation.

Possible causes: 

1. Open or shorted TPS signal and/or ground circuits
2. TCM connector problems
3. TPS or TPS connector (Check PCM DTCs)
4. PCM
5. TCM

Name of code: P0870(31) - OD Hydraulic Pressure Test Failure 

P0845(32) - 2/4 Hydraulic Pressure Test Failure 

P0992(33) - 2-4/OD Hydraulic Pressure Test Failure 

Set condition:  Immediately after a shift into 1st, 2nd, or 3rd gear, with engine speed above 1000 RPM, the TCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate pressure switch closes. If the pressure switch does not close it is tested again. If the switch does not close the second time, the appropriate code is set.

Theory of operation:  The Transmission Control Module (TCM) tests the OD and 2/4 pressure switches when they are off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test verifies that the switches are operational. The TCM verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is retested, If it fails the second test, the code is set.

Transmission Effects:  The MIL illuminates and the transmission system defaults to Limp-in mode.

Possible causes: 

1. Pressure switch sense circuit shorted to battery between TCM and solenoid pack.
2. Low line pressure
3. Solenoid Pack