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P0304-CYLINDER 4 MISFIRE (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (K342), (A955) ASD RELAY OUTPUT CIRCUIT (K14) INJECTOR CONTROL NO.4 CIRCUIT (K15) COIL CONTROL NO.4 CIRCUIT IGNITION WIRE SPARK PLUG IGNITION COIL FUEL PUMP INLET STRAINER PLUGGED RESTRICTED FUEL SUPPLY LINE FUEL PUMP MODULE FUEL PRESSURE LEAK DOWN FUEL INJECTOR ENGINE MECHANICAL PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. CYLINDER MIS-FIRE CONDITION ACTIVE Engine running. Observe the WHICH CYLINDER IS MISFIRING screen for at least one minute with the scan tool. Is there a misfire present at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 343 |