## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-226

DTC 3:MAP Sensor Circuit Malfunction

1. Reset the ECM/PCM (see page 11-168).
2. 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.

3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II).
5. 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.

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.

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.

8. Turn the ignition switch OFF.
9. Disconnect the MAP sensor 3P connector.
10. Turn the ignition switch ON (II).
11. 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.