(1) If removing a wire harness, check the wiring and clamping before proceeding so that it can be restored in the same way. (2) Never twist, pull or slacken the wire harness more than necessary. (3) The wire harness should never come into contact with a high temperature part, or rotating, moving, vibrating or sharp-edged parts. Avoid contact with panel edges, screw tips and other sharp items. (4) When installing parts, never pinch the wire harness. (5) Never cut or break the cover of the wire harness. If it is cut or broken, replace it or repair it with vinyl tape. agn 2. CHECK FOR OPEN CIRCUIT (a) For an open circuit in the wire harness in Fig.
1, check the resistance or voltage, as described below. (b) Check the resistance. (1) Disconnect connectors A and C and measure the resistance between them. Standard resistance (Fig. 2): TESTER CONNECTION SPECIFIED CONDITION Connector A terminal 1 - Connector C terminal 1 10 kΩ or higher Connector A terminal 2 - Connector C terminal 2 Below 1 Ω HINT: Measure the resistance while lightly shaking the wire harness vertically and horizontally. If the results match the examples above, an open circuit exists between terminal 1 of connector A and terminal 1 of connector C. (2) Disconnect connector B and measure the resistance between the connectors. Standard resistance (Fig. 3):
TESTER CONNECTION SPECIFIED CONDITION Connector A terminal 1 - Connector B1 terminal 1 Below 1 Ω Connector B2 terminal 1 - Connector C terminal 1 10 kΩ or higher If the results match the examples above, an open circuit exists between terminal 1 of connector B2 and terminal 1 of connector C. (c) Check the voltage. (1) In a circuit in which voltage is applied to the ECU connector terminal, an open circuit can be checked by conducting a voltage check. With each connector still connected, measure the voltage between the body ground and these terminals (in this order): 1) terminal 1 of connector A, 2) terminal 1 of connector B, and 3) terminal 1 of connector C. Standard voltage (Fig. 4):
cardi TESTER CONNECTION SPECIFIED CONDITION Connector A terminal 1 - Body ground 5 V Connector B terminal 1 - Body ground 5 V