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CAUTION: Stop All Actuations. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 3 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) Below Specification Go To 12 3. O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensor’s Signal or Return circuit is shorted to ground the scan tool will display all NOTE: If one of the O2 Sensor Signal or Return circuits are shorted to voltage, the scan tool will display all NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage Is the voltage switching between 2.5 and 3.4 volts? Yes >> Go To 4 No >> Go To 8 4. 2/1 O2 SENSOR HEATER OPERATION Turn the ignition off. NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow NOTE: Perform the following test on all O2 Sensors. With a scan tool, actuate the 2/1 O2 Heater Test. With the scan tool, monitor 2/1 O2 Sensor voltage for at least 2 minutes. Does the voltage stay above 4.5 volts? Yes >> Replace the 2/1 O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 9 - 200 ENGINE ELECTRICAL DIAGNOSTICS LX |