DTC Troubleshooting: P1498 (12-2)

DTC P1498 (12-2):  EGR Valve Position Sensor Circuit High Voltage

1.Reset the ECM/PCM.

2.Start the engine.

Is DTC P1498 indicated?

YES - Go to 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.n

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.


Is there about 5 V?

YES - Replace the EGR valve.n

NO - Go to 7.

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


Is there about 5 V?

YES - Repair open in the wire between the EGR valve and the ECM/PCM (A10).n

NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original  ECM/ PCM.n