DTC 3: MAP Sensor Circuit Malfunction Reset the ECM/PCM (see page 11-468). Start the engine and let it idle. Is the MIL on and does it indicate DTC 3? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAP sensor and at the ECM/PCM. Turn the ignition switch OFF. Turn the ignition switch ON (II). Measure voltage between ECM/PCM connector terminals A11 and A21. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there about 5 V? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Go to step 6. Measure voltage between ECM/PCM connector terminals A11 and A19. ECM/PCM CONNECTOR A (31P) Wire side of female terminals

Is there about 3 V? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Go to step 7. 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 - Go to step 8. NO - Go to step 13. Turn the ignition switch OFF. Disconnect the MAP sensor 3P connector. Turn the ignition switch ON (II). Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. MAP SENSOR 3P CONNECTOR Wire side of female terminals Is there about 5 V? YES - Go to step 12. NO - Repair open in the wire between the ECM/PCM (A11) and the MAP sensor.