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TEST ACTION APPLICABILITY 4 Turn the ignition off. All Yes → Replace the Fuel Pump Inlet Strainer. No → 5 If there are no possible causes remaining, view repair. All Repair Replace the Fuel Pump Module. 6 Turn the ignition on t, read the O2 Sensor voltage. Is the voltage between 0.4 to 0.6 volt? All Yes → No → 7 Turn the ignition off. t, actuate the O2 Heater Test. With the DRBIII t, monitor O2 Sensor voltage for at least 2 minutes. Does the voltage stay between 0.4 and 0.6 volt? All Yes → Replace the O2 Sensor. No → 8 NOTE: The engine must be at operating temperature and in closed loop to t select System Tests, perform the Purge Vapors Test. Observe the Short Term Adaptive value and press 3 to flow. All Yes → No → Refer to the Driveability category and perform the appropriate 108 DRIVEABILITY - GAS P0172-1/1 FUEL SYSTEM RICH — Continued |