Connector C terminal 1 - Body ground TESTER CONNECTION Below 1 V SPECIFIED CONDITION agn If the results match the examples above, an open circuit exists in the wire harness between terminal 1 of connector B and terminal 1 of connector C. 3. CHECK FOR SHORT CIRCUIT (a) If the wire harness is ground shorted (Fig. 5), locate the section by conducting a resistance check with the body ground (below). (b) Check the resistance with the body ground. (1) Disconnect connectors A and C and measure the resistance. Standard resistance (Fig. 6): TESTER CONNECTION SPECIFIED CONDITION Connector A terminal 1 - Body ground Below 1 Ω Connector A terminal 2 - Body ground 10 kΩ or higher HINT:
Measure the resistance while lightly shaking the wire harness vertically and horizontally. If the results match the examples above, a short circuit exists between terminal 1 of connector A and terminal 1 of connector C. (2) Disconnect connector B and measure the resistance. Standard resistance (Fig. 7): TESTER CONNECTION SPECIFIED CONDITION Connector A terminal 1 - Body ground 10 kΩ or higher Connector B2 terminal 1 - Body ground Below 1 Ω If the results match the examples above, a short circuit exists between terminal 1 of connector B2 and terminal 1 of connector C. 4. CHECK AND REPLACE ECU NOTICE: The connector should not be disconnected from the ECU.
Perform the inspection from the backside of the connector on the wire harness side. When no measuring condition is specified, perform the inspection with the engine stopped and the ignition switch ON. Check that the connectors are fully seated. Check for loose, corroded or broken wires. (a) First, check the ECU ground circuit. If it is faulty, repair it. If it is normal, the ECU could be faulty. Temporarily replace the ECU with a normally functioning one and check if the symptoms occur. If the trouble symptoms disappear, replace the original ECU. (1) Measure the resistance between the ECU ground terminal and body ground. Standard resistance: Below 1 Ω cardi