Control Module: Testing and Inspection

Inspection of 4WD Control Module and Its Circuits

4WD control module and its circuits can be checked at connector connected to 4WD control module by measuring voltage, pulse signal.

NOTE:

If you connect a voltmeter or ohmmeter directly to the 4WD control module terminals by removing the control module connectors, you can damage the control module.

Never connect a voltmeter or an ohmmeter directly to any terminal of the 4WD control module by disconnecting the control module connectors.

Voltage and Signal Check

1) Check voltage using voltmeter (1) connected to each terminal of connectors.
2) Check signal using oscilloscope (2) connected to each terminal of connectors.

NOTE:
- As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition switch is turned ON.
- Pulse signal cannot be measured by voltmeter. It can be measured by oscilloscope.
- Item with asterisk (*) in normal voltage column can be read only by oscilloscope.





Terminal arrangement of 4WD control module connector (Viewed from harness side)















Reference waveform No.1

Coupling assembly signal











Reference waveform No.2

CAN communication signal