Measure voltage between body ground and ECM/PCM connector terminals A4, A5, A23 and A24 individually. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there less than 1.0 V? YES - Repair open in the wire (s) between that had more than 1.0 V between G101 and the ECM/PCM (A4, A5, A23, A24). NO - Go to step 55. Measure voltage between body ground and ECM/PCM connector terminal A21. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there about 5 V? YES - Go to step 63. NO - Go to step 56.

Turn the ignition switch OFF. Disconnect the manifold absolute pressure (MAP) sensor 3P connector. Turn the ignition switch ON (II). Measure voltage between body ground and ECM/PCM connector terminal A21. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there about 5 V? YES - Replace the MAP sensor. NO - Go to step 60. Turn the ignition switch OFF. Disconnect ECM/PCM connector A (31P).