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6E–261 TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS DTC P0300 – Engine Misfire Detected (Cont'd) Step No Yes Value(s) Action 8 1. Install a spark tester at the spark plug end of the ignition coil for a cylinder that indicated a misfire. 2. Crank the engine while observing the spark tester. A crisp, blue spark should be observed. Is adequate spark present? — Go to Step 14 Go to Step 9 9 1. Remove and visually/physically inspect the ignition coil(s) associated with the cylinders that were 2. If a problem is found, replace the damaged ignition coil(s) as necessary. Did any ignition coils require replacement? — Verify repair Go to Step 10 10 1. Remove the spark plugs from the cylinders that were indicated as misfiring. 2. Visually inspect the spark plug electrodes. Does your inspection reveal any spark plugs exhibiting — Go to Engine Mechanical Diagnosis Go to Step 11 11 1. Visually inspect the spark plug insulators for cracks, carbon tracking, or other damage. 2. If a problem is found, replace the faulty spark plug(s) as necessary. Did your inspection reveal a problem? — Verify repair Go to Step 12 12 1. Disconnect the MAF sensor electrical connector. monitoring the “BANK 1 L.T. FUEL TRIM” and Do both values decrease below the specified values? ”BANK 1 L.T. FUEL TRIM” below +20%; “BANK 1 S.T. FUEL TRIM” below +50% Go to Step 13 Replace the ignition coil of the affected cylinder 13 Replace the ignition coil control module. Is the action complete? — Verify repair — 14 1. Visually and physically inspect the PCM injector grounds, power grounds and sensor grounds to 2. If a problem is found, correct the faulty ground condition as necessary. Did your inspection reveal a poor ground? — Verify repair Go to Step 15 15 1. Perform the “Fuel System Pressure Test” procedure. 2. If a problem is found, repair as necessary (refer to Engine Fuel or Fuel Metering System). Was a fuel system problem found? — Verify repair Go to Step 16 16 1. Check the fuel for excessive water, alcohol, or other contaminants (refer to Diagnosis in Engine Fuel for procedure). 2. If a problem is found, correct the contaminated fuel condition as necessary. Was the fuel contaminated? — Verify repair Go to Step 17 |