EGR System

DTC Troubleshooting (cont'd)

11-458  

DTC P1498: EGR Valve Position Sensor Circuit High Voltage

  1. Reset the ECM/PCM (see page 11-312).
  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.


  1. Turn the ignition switch OFF.
  2. Disconnect the EGR valve 6P connector.
  3. Turn the ignition switch ON (II).
  4. 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.


  1. 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 11-313). If symptom/indication goes away, replace the original ECM/PCM.