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ENGINE DRIVEABILITY AND EMISSIONS 6E–149 6 Using the DVM and check the O 2 sensor circuit. 1. Ignition “On”, engine “Off”. 2. Disconnect the O 2 sensor connector. 3. Check the circuit for short to power supply circuit. Was the DVM indicated specifed value? Less than 1V Go to Step 15 Repair faulty harness and verify repair 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 power supply circuit. Was the DVM indicated specified value? No continuity Go to Step 9 Go to Step 8 8 Repair the short to heater power supply circuit. — Verify repair Go to Step 15 9 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 11 Go to Step 10 10 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 11 11 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 13 Go to Step 12 Step Action Value(S) Yes No 1 2 V V E77 1 2 4 1 2 3 4 O 2 Sensor |