Digital Transmission Range (TR) Sensor Diagnostic Chart

Digital Transmission Range (TR) Sensor Diagnosis Chart








a. Will read "DRIVE" if O/D is canceled

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 misaligned or a digital TR sensor circuit failure of TR1, TR2, TR3A or TR4.
C. TR - D: 1= Open digital TR switch, 0= Closed digital TR switch.
D. EEC-V Control System Breakout Box Readings: Taken from PCM signal pins for TR1, TR2, TR3A and TR4 to signal return.
^ Voltages for TR1, TR2 and TR4:
^ 0 = 0.0 volts
^ 1 = 9.0 - 14.0 volts
^ Voltage for TR3A:
^ 0 = 0.0 volts
^ 0-1 = 1.3 - 1.8 volts
^ 1.8 - 5.0 volts = Invalid Reading (open in wires or bad resistor in digital TR sensor).

Wiggle Test Information for Open/Shorts
A. TR4, TR3A, TR2 and TR1 are all closed in PARK. PARK is a good position to check for intermittent open circuits (with diagnostic tool monitoring TR-D).
B. 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 transaxle 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 terminal from the PCM connector. If the short is still present, then the PCM has an internal failure. Otherwise, the failure is in the vehicle harness.