## EGR System

#### DTC Troubleshooting (cont'd)

11-158

DTC P1498:EGR Valve Position Sensor Circuit High Voltage

1. Reset the ECM/PCM (see page 11-4).
2. Start the engine.

Is DTC P1498 indicated?

YES | - Go to step 3.
NO | - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the EGR valve and at the ECM/PCM.

3. Turn the ignition switch OFF.
4. Disconnect the EGR valve 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between the EGR valve 6P connector terminals No. 2 and No. 3.

EGR VALVE 6P CONNECTOR

Wire side of female terminals

Is there about 5 V?

YES | - Replace the EGR valve.
NO | - Go to step 7.

7. Measure voltage between ECM/PCM connector terminals A10 and A20.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there about 5 V?

YES | - Repair open in the wire between the EGR valve and the ECM/PCM (A10).
NO | - Substitute a known-good ECM/PCM and recheck (see page 11-6). If symptom/indication goes away, replace the original ECM/PCM.