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6E2–274 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS Hesitation, Sag, Stumble Symptom
Step Action Value(s) Yes No 1 DEFINITION: Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to OBD System Check 2 1. Perform a bulletin search. correct the condition as instructed in the bulletin. Was a bulletin found that addresses the symptom? — Verify repair Go to Step 3 3 Was a visual/physical check performed? — Go to Step 4 Go to Visual/Physic al Check 4 1. Check the fuel control heated oxygen sensors (HO2S, B1S1 and B2S1). The fuel control heated Silicon contamination causes a high but false Powertrain Control Module (PCM) and Sensors. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 5 5 1. Check the fuel pressure. Refer to Fuel System Pressure Test. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 6 6 Observe the TP angle display on the Tech 2 while Does the TP angle display steadily increase from 0% at — Go to Step 7 Go to Step 18 7 Monitor the long term fuel trim on the Tech 2. Is the long term fuel trim significantly in the negative — Go to Step 8 Go to Step 9 8 1. Check items that can cause the engine to run rich. Refer to Diagnostic Aids in DTC P0172 Diagnostic Support. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 10 9 1. Check items that can cause the engine to run lean. Refer to Diagnostic Aids in DTC P0171 Diagnostic Support. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 10 |