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6E–274 ENGINE DRIVEABILITY AND EMISSIONS Rough, Unstable, or Incorrect Idle, Stalling Symptom (Cont'd) Step No Yes Value(s) Action 17 1. Check ignition coils for cracks or carbon tracking. Was a problem found? — Verify repair Go to Step 18 18 Using Tech 2, monitor the throttle position (TP) angle Is the TP angle at the specified value and steady? 0% Go to Step 19 Refer to DTC P0123 for further diagnosis 19 1. Check the positive crankcase ventilation (PCV) valve for proper operation. Refer to Crankcase Ventilation System. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 20 20 1. Check the transmission range switch circuit. Use Tech 2 and be sure Tech 2 indicates that the vehicle 2. If a problem is found, diagnose and repair the transmission range switch as necessary (refer to Was a problem found? — Verify repair Go to Step 21 21 1. Check for the following engine mechanical items. Refer to Engine Mechanical for diagnosis procedures: D EGR valve mounted backward. Compare with D Low compression D Sticking or leaking valves D Worn camshaft lobe(s) D Camshaft drive belt slipped or stripped D Incorrect valve timing D Worn rocker arms D Broken valve springs 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 22 22 1. Check for faulty motor mounts. Refer to Engine Mechanical for inspection of mounts. 2. If a problem is found, repair as necessary. Was a problem found? — Verify repair Go to Step 23 23 1. Review all diagnostic procedures within this table. malfunctions have been found, review/inspect the D Visual/physical inspection D Tech 2 data D Freeze Frame data/Failure Records buffer D All electrical connections within a suspected 3. If a problem is found, repair as necessary. Was a problem found? — Verify repair Contact Technical Assistance |