Measure voltage between the MAP sensor 3P connector terminals No. 2 and No. 3. MAP SENSOR 3P CONNECTOR Wire side of female terminals Is there about 5 V? YES - Replace the MAP sensor. NO - Repair open in the wire between the ECM/PCM (A19) and the MAP sensor. Turn the ignition switch OFF. Disconnect the MAP sensor 3P connector. Turn the ignition switch ON (II). Measure voltage between ECM/PCM connector terminals A11 and A19. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there about 5 V? YES - Replace the MAP sensor. NO - Go to step 17.

Measure voltage between the MAP sensor 3P connector terminals No. 1 and body ground. MAP SENSOR 3P CONNECTOR Wire side of female terminals Is there about 5 V? YES - Go to step 18. NO - Repair open in the wire between the ECM/PCM (A21) and the MAP sensor. Turn the ignition switch OFF. Disconnect ECM/PCM connector A (31P). Check for continuity between ECM/PCM connector terminal A19 and body ground. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the ECM/PCM (A19) and the MAP sensor. NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.