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TEST ACTION APPLICABILITY 11 Only have one O2 Sensor disconnect at a time. t, monitor all the O2 Sensor voltage readings. NOTE: The DRBIII t will display all O2 Sensor voltage readings approxi- mately 5.0 volts when only one O2 Sensor’s Signal circuit is shorted to t will display one O2 Sensor voltage close to zero and the others will read lower than normal when one O2 Sensor Signal circuit All Yes → Go To 12 No → Check all the O2 Signal circuits for a short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM 12 Disconnect each O2 Sensor harness connector. t will display all O2 Sensor voltage readings approxi- mately 5.0 volts when only one O2 Sensor’s Return circuit is shorted to t will display one O2 Sensor voltage close to zero and the others will read lower than normal when one O2 Sensor Return circuit All Yes → Replace and program the Powertrain Control Module per Service Information. No → Check all the O2 Return circuits for a short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM 13 Turn the ignition off. t, actuate the ASD Fuel System test and observe the fuel pressure gauge. All Yes → Repair or replace fuel supply line as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 14 CAUTION: Stop All Actuations. 105 DRIVEABILITY - NGC P0171-FUEL SYSTEM 1/1 LEAN — Continued |