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ENGINE DRIVEABILITY AND EMISSIONS 6E–145 6 Using the DVM and check the O 2 sensor circuit. Breaker box is available: 1. Ignition “Off”, engine “Off”. 2. Install the breaker box as type A. (ECM disconnected) Ref. 6E-80. 3. Disconnect the O 2 sensor. 4. Check the circuit for short to heater ground or short to ground circuit. Was the problem found? Breaker box is not available: 1. Ignition “Off”, engine “Off”. 2. Disconnect the O 2 sensor connector and ECM connector. 3. Check the circuit for short to heater ground or short to ground circuit. Was the problem found? — Repair faulty harness and verify repair Go to Step 15 7 Using the DVM and check the O 2 sensor circuit. 1. Ignition “Off”, engine “Off”. 2. Disconnect the the O 2 sensor connector. 3. Check the circuit for short to heater ground circuit. Was the DVM indicated specified value? No continuity Go to Step 9 Go to Step 8 8 Repair the short to heater ground circuit. — Verify repair Go to Step 15 Step Action Value(s) Yes No 38 53 63 31 21 6 C56(J2) 31 21 6 C56(J2) 1 2 4 1 2 3 4 O 2 Sensor |