Turn the ignition switch OFF. Disconnect ECM/PCM connector A (31P). Connect the EGR valve 6P connector terminal No. 1 and body ground with a jumper wire. EGR VALVE 6P CONNECTOR Wire side of female terminals Check for continuity between ECM/PCM connector terminals A13 and body ground. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the EGR valve and the ECM/PCM (A13). Check for continuity between the EGR valve 6P connector terminal No. 1 and body ground. EGR VALVE 6P CONNECTOR Wire side of female terminals

Is there continuity? YES - Repair short in the wire between the EGR valve and the ECM/PCM (A13). NO - Go to step 18. Check for continuity between the EGR valve 6P connector terminal No. 6 and body ground. EGR VALVE 6P CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 19. NO - Repair open in the wire between the EGR valve and the G101. Disconnect ECM/PCM connector B (24P). Connect EGR valve 6P connector terminal No. 4 and body ground with a jumper wire. EGR VALVE 6P CONNECTOR Wire side of female terminals