How to Use the Inspection Procedures

HOW TO USE THE INSPECTION PROCEDURES

The causes of many of the problems occurring in electric circuitry are generally the connectors, components, the ECU, and the harnesses between connectors, in that order. These inspection procedures follow this order. They first try to discover a problem with a connector or a defective component.











CURRENT TROUBLE

Indicates that the trouble is currently present. Carry out troubleshooting as described in the applicable inspection procedure.

PAST TROUBLE

Indicates that the trouble is historic, but normal operation has been restored. Observe the applicable inspection procedure with particular emphasis on connector(s) and wiring harness.

HARNESS INSPECTION

Check for an open or short circuit in the harness between the terminals which were faulty according to the connector measurements. Carry out this inspection while referring to Harness Connector Inspection Harness Connector Inspection. Here, "Check harness between power supply and terminal xx" also includes checking for blown fuse. For inspection service points when there is a blown fuse, refer to "Inspection Service Points for a Blown Fuse Inspection Service Points for a Blown Fuse."

MEASURES TO TAKE AFTER REPLACING THE PCM, ECM OR ECU

If the trouble symptoms have not disappeared even after replacing the PCM, ECM or ECU, repeat the inspection procedure from the beginning.