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5. MAP SENSOR Turn the ignition off. Connect a vacuum gauge to a manifold vacuum source. Start the engine. Allow the engine to idle. NOTE: If engine will not idle, maintain a constant RPM above idle. Is the scan tool reading within 1 ( of the vacuum gauge reading? Yes >> Go to 6 No >> Replace the MAP Sensor. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 6. O2 SENSOR VOLTAGE Start the engine. If necessary, allow the engine to reach normal operating temperature. With a scan tool, monitor all O2 Sensor voltage readings. Is the voltage switching between 2.5 and 3.4 volts for all O2 sensors? Yes >> Go to 7 No >> Go to 9 7. 1/1 O2 SENSOR HEATER Turn the ignition off. NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow With a scan tool, actuate the 1/1 O2 Sensor heater. With the scan tool, monitor 1/1 O2 Sensor voltage for at least 2 minutes. Does the voltage stay above 4.5 volts? Yes >> Replace the 1/1 O2 Sensor. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go to 8 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 175 |