Digital Transmission Range Sensor Diagnosis Chart

DIGITAL TRANSMISSION RANGE (TR) SENSOR DIAGNOSIS CHART





* Will read "Drive" if O/D is canceled.

- TR_V is the voltage at the PCM pin 64 (TR3A Circuit) to signal return.
- "In Between" reading could be caused by a shift cable or digital TR sensor misaligned or a digital TR sensor circuit failure of TR1, TR2, TR3A, or TR4.
- TR_D: 1 = Open Digital TR switch, 0 = Closed Digital TR switch.
- Breakout Box Readings: Taken from PCM signal pins for TR1, TR2, TR3A, TR4 to signal return.
- Voltages for TR1, TR2, TR4: 0 = 0.0 volts (circuit shorted to ground)
- 1 = 9.0 - 14.0 volts (open circuit).
- Voltage for TR3A: 0 = 0.0 volts (circuit shorted to ground).
- 1 = 1.3 - 1.8 volts (open circuit).
- 0.0 volts = Closed Digital TR switch
- 1.8 - 5.0 volts = invalid Reading (open in wires or bad resistor in digital TR sensor).
- TR4, TR3A, TR2, and TR1 are all closed in PARK (shorted to signal return), so PARK is a good position to check for intermittent open circuits.
- 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.