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6E–149 ENGINE DRIVEABILITY AND EMISSIONS exhaust leaks that may cause a false lean condition to D MAF sensor –The system can go lean if the MAF D Fuel contamination – Water, even in small amounts, Fuel System Diagnosis for the procedure to check for fuel contamination. D If none of the above conditions are present, replace the Test Description Number(s) below refer to the step number(s) on the condition described in the “Diagnostic Aids” above. Reviewing the Failure Records vehicle mileage since the DTC P0151 – HO2S Circuit Low Voltage Bank 2 Sensor 1
Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to OBD System Check 2 1. Install Tech 2. under “Conditions for Setting the DTC” criteria 4. Using Tech 2, monitor Bank 2 HO2S 1 voltage. Does the Bank 2 HO2S 1 voltage remain below the 22 mV Go to Step 4 Go to Step 3 3 1. Ignition “ON,” engine “OFF,” review and record Tech 2 Failure Records data and note parameters. 2. Operate the vehicle within Failure Records conditions as noted. 3. Using Tech 2, monitor “Specific DTC” info for DTC P0151 until the DTC P0151 test runs. 4. Note test result. Does Tech 2 indicate DTC P0151 failed this ignition? — Go to Step 4 Refer to Diagnostic Aids 4 1. Turn ignition “OFF.” circuits for a short to ground or a short to the heater Were Bank 2 HO2S 1 signal circuits shorted? — Go to Step 5 Go to Step 6 5 Repair the Bank 2 HO2S 1 signal circuit. Is the action complete? — Verify repair — 6 1. Ignition “OFF.” signal circuits. Was there continuity between the high and low circuits? — Go to Step 7 Go to Step 8 7 Repair the short between the high and low circuits. Is the action complete? — Verify repair — |