Troubleshooting With Volt/Ohmmeter

HINT: Because the troubleshooting procedures are designed for inspection of each separate system, the actual troubleshooting procedure may vary somewhat. However, please refer to these procedures and perform actual troubleshooting, conforming to the inspection methods described. For example, it is better to first make a simple check of the fuses, fusible links and connecting condition of the connectors before making your inspection according to the procedures listed.
The troubleshooting procedures are based on the supposition that the trouble lies in either a short or open circuit in a component outside the ECM or a short circuit inside the ECM.
If engine trouble occurs even though proper operating voltage is detected in the ECM connectors, then the ECM is faulty and must be replaced.

NOTE:
- Perform all voltage measurement with the connectors connected.
- Verify that the battery voltage is 11 V or above when the ignition switch is ON.





Using a voltmeter with high impedance (10 k ohms/V minimum), measure the voltage at each terminal of the wiring connector.








Voltage at ECU wiring connectors