Honda Odyssey 2004. Manual — part 138
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−
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05
06
07
*05
YES
NO
YES
NO
YES
NO
11-250
EGR System
DTC Troubleshooting (cont’d)
EGR (PNK)
EGR (BLU/RED)*
PCM CONNECTOR B (25P)
EGR VALVE 6P CONNECTOR
JUMPER WIRE
EGR (PNK)
EGR
(BLU/RED)*
PCM CONNECTOR B (25P)
EGR (PNK)
EGR (BLU/RED)*
EGR VALVE 6P CONNECTOR
GND (BLK)
25. Turn the ignition switch OFF.
26. Disconnect PCM connector B (25P).
27. Check for continuity between PCM connector
terminal B7 and body ground.
Repair short in the wire between the EGR
valve and the PCM (B7).
Go to step 28.
28. Connect EGR valve 6P connector terminal No. 4 to
body ground with a jumper wire.
29. Check for continuity between PCM connector
terminal B7 and body ground.
Go to step 30.
Repair open in the wire between the EGR
valve and the PCM (B7).
30. Disconnect the jumper wire from the EGR valve 6P
connector.
31. Check for continuity between EGR valve 6P
connector terminal No. 6 and body ground.
Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
Repair open in the wire between the EGR
valve and G101.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
Is ther e continuity?
03/07/29 09:24:49 61S0X050_110_0250
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*05
02
03
S0X4AZ1K77100091491FAAT00
DTC P1491
’01 Model:
YES
NO
YES
NO
YES
NO
YES
NO
11-251
EGR VALVE 6P CONNECTOR
EGR (PNK)
GND (BLK)
EGR VALVE 6P CONNECTOR
SG2
(GRN/BLK)
VCC2
(YEL/BLU)
PCM CONNECTOR A (31P)
VCC2
(YEL/BLU)
SG2
(GRN/BLK)
EGR Valve
Insufficient Lift
1. Reset the PCM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on.
3. Test-drive the vehicle under load for about 10
minutes. Try to keep the engine speed in the
1,700
2,500 rpm range.
4. Check for a Temporary DTC with the scan tool or
the HDS.
Go to step 5.
Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the EGR valve and at the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the EGR valve 6P connector.
7. Start the engine, and let it idle.
8. Measure voltage between EGR valve 6P connector
terminals No. 4 and No. 6.
Substitute a known-good PCM, and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
Go to step 9.
9. Turn the ignition switch OFF.
10. Turn the ignition switch ON (II).
11. Measure voltage between EGR valve 6P connector
terminals No. 2 and No. 3.
Go to step 13.
Go to step 12.
12. Measure voltage between PCM connector
terminals A28 and A30.
Repair open in the wire between the EGR
valve and the PCM (A28, A30).
Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is T empor ar y DT C P1491 indicated?
Is ther e batter y voltage?
Is ther e about 5 V ?
Is ther e about 5 V ?
03/07/29 09:25:45 61S0X050_110_0251
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*01
*02
04
05
YES
NO
YES
NO
YES
NO
YES
NO
11-252
EGR System
DTC Troubleshooting (cont’d)
EGR VALVE 6P CONNECTOR
SG2
EGRP
EGR VALVE 6P CONNECTOR
VCC2
EGRP
PCM CONNECTOR A (31P)
SG2
(GRN/BLK)
EGRP
(WHT/BLK)
PCM CONNECTOR A (31P)
EGRP
(WHT/BLK)
13. Turn the ignition switch OFF.
14. At the sensor side, measure resistance between
EGR valve 6P connector terminals No. 1 and No. 2.
Replace the EGR valve.
Go to step 15.
15. Measure resistance between EGR valve 6P
connector terminals No. 1 and No. 3.
Replace the EGR valve.
Go to step 16.
16. Reconnect the EGR valve connector.
17. Turn the ignition switch ON (II).
18. Measure voltage between PCM connector
terminals A16 and A28.
Go to step 21.
Go to step 19.
19. Turn the ignition switch OFF.
20. Check for continuity between PCM connector
terminal A16 and body ground.
Repair short in the wire between the EGR
valve and PCM (A16).
Repair open in the wire between the EGR
valve and PCM (A16).
21. Turn the ignition switch OFF.
22. Disconnect the EGR valve 6P connector.
Terminal side of male terminals
Terminal side of male terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity or r esistance of 100 k
or
mor e?
Is ther e 100 k
or mor e?
Is ther e about 1.2 V ?
Is ther e continuity?
03/07/29 09:25:46 61S0X050_110_0252
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*03
06
07
08
YES
NO
YES
NO
YES
NO
11-253
EGR VALVE 6P CONNECTOR
GND
EGR
PCM CONNECTOR B (24P)
EGR (PNK)
EGR VALVE 6P CONNECTOR
JUMPER WIRE
EGR
(PNK)
PCM CONNECTOR B (24P)
EGR (PNK)
23. Connect the battery positive terminal to EGR valve
6P connector terminal No. 4 with a jumper wire.
24. Start the engine, and let it idle. Then connect the
battery negative terminal to EGR valve 6P
connector terminal No. 6 with a jumper wire.
Go to step 25.
Replace the EGR valve.
25. Turn the ignition switch OFF.
26. Disconnect PCM connector B (24P).
27. Check for continuity between PCM connector
terminal B3 and body ground.
Repair short in the wire between the EGR
valve and the PCM (B3).
Go to step 28.
28. Connect EGR valve 6P connector terminal No. 4 to
body ground with a jumper wire.
29. Check for continuity between PCM connector
terminal B3 and body ground.
Go to step 30.
Repair open in the wire between the EGR
valve and the PCM (B3).
(cont’d)
Terminal side of male terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Does the engine stall or r un r ough?
Is ther e continuity?
Is ther e continuity?
03/07/29 09:25:47 61S0X050_110_0253
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