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6E–480 6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS Hesitation, Sag, Stumble Symptom (Cont'd) Step No Yes Value(s) Action 10 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 11 11 1. Check for proper ignition voltage output with spark tester J 26792 (ST-125). Refer to Electronic Ignition System for the procedure. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 12 12 1. Check for a loose ignition coil ground and ION Sensing module circuit. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 13 13 1. Check the ignition coils for cracks or carbon tracking. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 14 14 1. Remove spark plugs and check for wet plugs, cracks, wear, improper gap, burned electrodes, or Electronic Ignition System. NOTE: If spark plugs are gas or oil fouled, the cause of 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 15 15 1. Check the PCM grounds for clearness, tightness and proper routing. Refer to the PCM wiring 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 16 16 1. Check the MAF sensor connections. necessary. Refer to Electrical Diagnosis for wiring repair procedures. Was a problem found? — Verify repair Go to Step 17 |