19-2 19-2 Electrical System Troubleshooting BEFORE TROUBLESHOOTING CONNECTOR HANDLING 1. Disconnect the battery plug before connecting or disconnecting each connector or terminal. 2. When disconnecting a connector, do not pull the wire harness but hold the connector itself and pull it after unlocking it. To connect, push the connector fully until it is locked in position. 3. Bring a tester probe into contact with a connector terminal from the rear side of the connector (harness side). 4.
If insertion from the rear side is impossible, as in the case of a waterproof connector, bring the tester probe carefully into contact with the terminal so as not to cause deformation of the connector terminal. 5. Do not touch connector terminals directly with your hand. 6. When bringing tester probes into contact with terminals that voltage is applied to prevent two tester probes from coming into contact with each other. WIRE HARNESS AND CONNECTOR INSPECTION PROCEDURE When any trouble occurs, first inspect the connectors and wire harness of the related circuit according to the following procedure: Continuity Inspection 1. Disconnect the connectors at both ends of the corresponding harness.
2. Measure the resistance between corresponding terminals of the connectors at both ends. Standard: 10 Ω or less Note: Measure while jiggling the wire harness up and down and sideways. Open circuit at the wire harness occurs rarely partway through a vehicle wiring but mostly at connectors. Inspect especially the sensor connectors with sufficient care. Section 19