Inspection of TCM and Its Circuits

Inspection of TCM and Its Circuits
TCM and its circuits can be checked at TCM wiring connectors by measuring voltage and resistance.

CAUTION: TCM cannot be checked by itself, it is strictly prohibited to connect voltmeter or ohmmeter to TCM with connector disconnected from it.

Inspection
1. Remove TCM (1) from vehicle referring to Transmission Control Module (TCM) Removal and Installation.
2. Connect TCM connectors (2) to TCM.
3. Check voltage at each terminal of connectors connected.

NOTE: As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is ON.








Terminal arrangement of TCM coupler (Viewed from harness side)

Terminal arrangement of TCM coupler (Viewed from harness side):

1. Reference waveform No. 1
Output shaft speed sensor signal (1) and input shaft speed sensor signal (2) at 64 km/h (40 mph)








2. Reference waveform No. 2
Throttle opening signal (from ECM)








3. Reference waveform No. 3
Engine coolant temp. signal (from ECM)








4. Reference waveform No. 4
Serial data line to speedometer








5. Reference waveform No. 5
Engine speed signal from ECM








6. Reference waveform No. 6
Engine torque reduction signal








7. Reference waveform No. 7
Engine torque signal from ECM








8. Reference waveform No. 8
Serial communication line from ECM











9. Reference waveform No. 9
Pressure control solenoid valve output signal