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TEST ACTION APPLICABILITY 2 Warning: The fuel system is under a constant pressure (even with the engine t, actuate the ASD Fuel System test and observe the fuel pressure gauge. All Within Specification Above Specification Replace the fuel filter/pressure regulator. Caution: Stop All Actuations. 3 Turn the ignition on t, read the O2 Sensor voltage. Is the voltage between 0.4 to 0.6 volts? All Yes → Go To 4 No → Go To 11 4 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 All Yes → Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 5 5 Turn the ignition off. All Yes → Go To 6 No → Replace the EVAP Purge Solenoid. Perform POWERTRAIN VERIFICATION TEST VER - 5. 83 DRIVEABILITY - SBEC P0172-1/1 FUEL SYSTEM RICH — Continued |