DTC P1498: EGR Valve Position Sensor Circuit High Voltage Reset the ECM/PCM (see page 11-312). 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. Turn the ignition switch OFF. Disconnect the EGR valve 6P connector. Turn the ignition switch ON (II). 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.

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.