Turn the ignition switch OFF. Reset the ECM/PCM. Exchange the injector from the problem cylinder with one from the another cylinder. Let the engine idle for 2 minutes. Test-drive the vehicle several times under various conditions. Is DTC 71, 72, 73 or 74 indicated? YES - Go to step 18. NO - Intermittent misfire due to bad contact in the injector connector (no misfire at this time). Determine which cylinder had the misfire. Does the misfire occur in the other cylinder whose injector was exchanged? YES - Replace the faulty injector. NO - Go to step 19. Turn the ignition switch OFF. Disconnect the ignition coil 3P connector from the problem cylinder. Turn the ignition switch ON (II).

Measure voltage between the ignition coil 3P connector terminal No. 3 and body ground. IGNITION COIL 3P CONNECTOR Wire side of female terminals Is there battery voltage? YES - Go to step 23. NO - Repair open or short in the wire between the No. 1 IGN COIL (15A) fuse and the ignition coil. Turn the ignition switch OFF. Check for continuity between the ignition coil 3P connector terminal No. 2 and body ground. IGNITION COIL 3P CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 25. NO - Repair open in the wire between the ignition coil and G101. Disconnect ECM/PCM connector C (31P).