Shift Solenoid Failure Mode Charts

Shift Solenoid Failure "Always Off"
Failed OFF due to powertrain control module and/or vehicle wiring concerns, and/or solenoid electrically stuck off and/or hydraulically stuck off.











Shift Solenoid Failure "Always On"
Failed ON due to powertrain control module (PCM) and/or vehicle wiring concerns; solenoid electrically or mechanically stuck on.

Digital Transmission Range (TR) Sensor Diagnosis Chart:

A. TR_V is the voltage at the PCM Pin 64 (TR3A Circuit) to Signal Return.
B. "IN-BETWEEN" reading could be caused by a shift cable or digital TR sensor misalignment or a digital TR circuit failure of TR 1, TR2, TR3A or TR4.
C. TR_D: 1 = Open digital TR Switch; 0 = Closed digital TR Switch
D. Breakout Box Readings:
- Taken from PCM Signal Pins for TR 1, TR2, TR3A, TR4 to Signal Return.
- 0.0 volts = Closed digital TR Switch;
- 1.3-1.8 volts = Open digital TR Switch;
- 1.8-5.0 volts = Invalid Reading (open in wires or bad resistor in digital TR sensor).
- Voltage for TR 1, TR2, TR4:
- 0=0.0 volts (circuit shorted to ground). 1 = 9.0-14.0 volts (open circuit).
- Voltages for TR3A:
- 0 = 0.0 volts (circuit shorted to ground). 1 = 1.3-1.8 volts (open circuit).

E. TR4, TR3A, TR2 and TR 1 are all closed in park (shorted to signal return), so PARK is a good position to check for intermittent open circuits.
F. TR4, TR3A, TR2, and TR1 are all open in overdrive, so OVERDRIVE is a good position to check for shorts to ground. To determine the shorted components while observing TR_D, unplug the TR and see if the short goes away. If the short is still present, unplug the transmission harness and see if the short goes away. If the short is still present, then the short is in the PCM or vehicle harness. Remove the suspect circuit(s) wire from the PCM vehicle harness. If the short is still present, then the PCM has an internal failure, otherwise the failure is in the vehicle harness.