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, pulse signal 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.

1. Remove TCM (1) from vehicle.
2. Connect TCM connectors (2) to TCM.
3. Check voltage and/or pulse signal at each terminal of connectors connected using voltmeter (3) and oscilloscope (4).

NOTE:
^ As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is ON.
^ Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.





3. Body ground

Connector "E92"

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Connector "E93"

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Reference Waveform No. 1
Pressure control solenoid valve-A signal at ignition switch ON position








Reference Waveform No. 2
TCC pressure control solenoid valve signal at ignition switch ON position








Reference Waveform No. 3
CAN communication line signal at engine idling








Reference Waveform No. 4
Pressure control solenoid valve-C signal at ignition switch ON position








Reference Waveform No. 5
Pressure control solenoid valve-B signal at ignition switch ON position








Reference Waveform No. 6
Output shaft speed sensor signal at vehicle speed 20 km/h, 12.5 mile/h








Reference Waveform No. 7
Input shaft speed sensor signal at engine idling