Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM CONNECTOR A (31P) Wire side of female terminals PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOUR No. 1 DTC 71 A30 YEL/GRN No. 2 DTC 72 A29 BLU/RED No. 3 DTC 73 A28 WHT/BLU No. 4 DTC 74 A27 BRN Is there continuity? YES - Repair short in the wire between the ECM/PCM and the ignition coil. NO - Go to step 27. Connect the appropriate ignition coil 3P connector terminal No. 1 and body ground with a jumper wire (see table). IGNITION COIL 3P CONNECTOR Wire side of female terminals PROBLEM CYLINDER DTC WIRE COLOUR No. 1 DTC 71 YEL/GRN No. 2 DTC 72 BLU/RED No. 3 DTC 73 WHT/BLU No. 4 DTC 74 BRN

Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM CONNECTOR A (31P) Wire side of female terminals PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOUR No. 1 DTC 71 A30 YEL/GRN No. 2 DTC 72 A29 BLU/RED No. 3 DTC 73 A28 WHT/BLU No. 4 DTC 74 A27 BRN Is there continuity? YES - Go to step 29. NO - Repair open in the wire between the ECM/PCM and the ignition coil. Check the engine compression. Is the engine compression OK? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Repair the engine. Turn the ignition switch OFF, and disconnect ECM/PCM connector B (24P). Turn the ignition switch ON (II).