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ENGINE DRIVEABILITY AND EMISSIONS 6E–237 HESITATION, SAG, STUMBLE SYMPTOM DEFINITIONS: Momentary lack of response as the 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. Perform a bulletin search. 2. If a bulletin that addresses the symptom is found, 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 / physical Check. 4 Check the fuel quality. — Replace fuel Go to Step 5 5 1. Using a Tech 2, display the MAP sensor value in comparison with atmosphere temperature. 2. Check for a faulty, plugged, or incorrectly installed MAP sensor. Was the problem found? — Verify repair Go to Step 6 6 Observe the throttle position display on the Tech 2 — Go to Step 7 Refer to Diagnostic Trouble Code P0123 for further diagnosis 7 Check the knock sensor wire, shield wire, or — Verify repair Go to Step 8 8 Run Engine. — Verify repair Go to Step 9 9 Check the fuel pressure. Refer to Fuel System — Verify repair Go to Step 10 |