Honda 2004 Odyssey Service Manual page 565

EGR System
DTC Troubleshooting (cont'd)
DTC P1498 '01 Model:
Sensor Circuit High Voltage
1. Reset the PCM (see page 11-4).
2. Start the engine.
Is DT C P1498 indicated?
YES Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the EGR valve and the 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 EGR valve 6P connector
terminals No. 2 and No. 3.
EGR VALVE 6P CONNECTOR
SG2
(GRN/BLK)
Wire side of female terminals
Is there about 5 V ?
YES Replace the EGR valve.
NO Go to step 7.
11-256
EGR Valve Position
VCC2
(YEL/BLU)
7. Measure voltage between PCM connector
terminals A28 and A30.
PCM CONNECTOR A (31P)
SG2
(GRN/BLK)
Wire side of female terminals
Is there about 5 V ?
YES Repair open in the wire between the EGR
valve and the PCM (A28).
NO Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
VCC2
(YEL/BLU)