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ENGINE DRIVEABILITY AND EMISSIONS 6E–153 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 open 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 open circuit. Was the problem found? — Repair faulty harness and verify repair Go to Step 13 7 1. Using the Tech 2, ignition “On” and engine “On”. 2. Monitor the “Manifold Absolute Pressure” in the data display. Does the Tech 2 indicate correct “Manifold Absolute — Go to Step 9 Go to Step 8 8 Remove the MAP sensor and check for the following • Objects blocking the air cleaner. • Objects blocking the MAP sensor. • Objects blocking the throttle valve. • Vacuum leaking at intake duct. • Vacuum leaking at throttle body. — Verify repair Go to Step 9 9 1. Using the Tech 2, ignition “On” and engine “On”. 2. Select the “Miscellaneous Test” and perform the “IAC Control” in the “IAC System”. 3. Operate the Tech 2 in accordance with procedure. Was the engine speed changed, when the IAC valve is — Go to Step 11 Go to Step 10 Step Action Value(s) Yes No 1 2 38 53 E77 1 2 21 6 C56(J2) E77 |