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