Pinpoint Tests-Non OSC Equipped Vehicles

Pinpoint Tests-Non OSC Equipped Vehicles





Special Tool(s)

Any time an electrical connector or solenoid body is disconnected, inspect the connector for terminal condition, corrosion and contamination. Also inspect the connector seal for damage. Clean, repair or install new components as required.





Digital 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, WA, 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, TR4 to signal return.

^Voltages for TRI, TR2, TR4:
^0 = 0.0 volts
^1 = 9.0 - 14.0 volts
^Voltage for TR3A:
^0 = 0.0 volts
^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 scan 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.

Shit Solenoid Pre-Diagnosis
Use the following shift solenoid operation information when carrying out Pinpoint Test A.





Solenoid Operation Chart
a. When transmission fluid temperature is below 38°C (100°F), then SSA=OFF, SSB=ON, SSC=ON to prevent cold creep.
b. Not contributing to powerflow.
c. When a manual pull-in occurs above a calibrated speed, the transaxle will downshift from the higher gear until the vehicle speed drops below the calibrated speed.

Shift Solenoid Failure Mode Chart "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.
a. When a manual pull-in occurs above a calibrated speed, the transaxle will downshift from the higher gear until the vehicle speed drops below this calibrated speed.





a. When a manual pull-in occurs above a calibrated speed, the transaxle will downshift from the higher gear until the vehicle speed drops below this calibrated speed.





a. When manual pull-in occurs above a calibrated speed, the transaxle will downshift the higher gear until the vehicle speed drops below this calibrated speed.
b. With engine braking.

Shift Solenoid Failure Mode Chart "Always On"





Failed ON due to powertrain control module and/or vehicle wiring concerns; solenoid electrically or mechanically stuck on.
a. When a manual pull-in occurs above a calibrated speed, the transaxle will downshift from the higher gear until the vehicle speed drops below the calibrated speed.
c. SSC overrides forward clutch.





a. When a manual pull-in occurs above a calibrated speed, the transaxle will downshift from the higher gear until the vehicle speed drops below the calibrated speed.
c. SSC overrides forward clutch.





b. No engine braking.