Honda Odyssey 2004. Manual — part 145
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01
S0X4AZAK77100091456FAAT00
DTC P1456
’02-04 Models:
Special Tools Required
Fuel Fill Cap Check
YES
NO
YES
NO
EVAP Canister Purge Valve Test
YES
NO
11-278
EVAP System
DTC Troubleshooting (cont’d)
A
A973X-041-
XXXXX
EVAP Control
System Leakage (fuel tank system)
The fuel system is designed to allow specified
maximum vacuum and pressure conditions. Do not
deviate from the vacuum and pressure tests as
indicated in these procedures. Excessive pressure/
vacuum would damage the EVAP components or cause
eventual fuel tank failure.
Vacuum pump/gauge, 0
30 in.Hg A973X-041-XXXXX
NOTE: If DTC P0461 is stored at the same time as DTC
P1456, troubleshoot P0461 first, then recheck for DTC
P1456.
This is a two trip code; once cleared, it cannot be
reproduced in one trip. Also, certain specific driving
and ambient conditions must occur before the PCM will
complete the system checks. Additional test drives may
still not meet the specific conditions needed to
reproduce the code.
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the problem or code.
NOTE: Fresh fuel has a higher volatility that will create
greater pressure/vacuum. The optimum condition for
testing is fresh fuel and less than a full tank of gas. If
possible, to assist in leak detection, add 1 gallon of
fresh fuel to the tank (as long as it will not fill the tank),
just before starting these procedures.
1. Check the fuel fill cap. It must say ‘‘If not tightened
3 clicks check engine light may come on.’’
Go to step 2.
Replace or tighten the cap.
2. Check the fuel fill cap seal.
Replace the fuel fill cap (gray or black
colored cap).
The fuel fill cap is OK. Go to step 3.
3. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuum
pump to the hose.
4. Turn the ignition switch ON (II).
5. Apply vacuum to the hose.
The EVAP canister purge valve is OK. Go to
step 11.
Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect the EVAP canister purge valve 2P
connector.
Is the cor r ect f uel f ill cap installed and pr oper ly
tightened?
Is the f uel f ill cap seal missing or damaged?
Does the valve hold vacuum?
03/07/29 09:26:11 61S0X050_110_0278
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02
03
03
*02
YES
NO
YES
NO
EVAP Bypass Solenoid Valve Test
YES
NO
11-279
EVAP CANISTER PURGE VALVE
PCS (RED/YEL)
PCS (RED/YEL)
EVAP CANISTER PURGE
VALVE 2P CONNECTOR
A973X-041-
XXXXX
A
PCM CONNECTOR A (32P)
2WBS (BLU)
JUMPER WIRE
8. Check for continuity between EVAP canister purge
valve 2P connector terminal No. 2 and body ground.
Go to step 9.
Replace the EVAP canister purge valve.
9. Disconnect PCM connector A (32P).
10. Check for continuity between EVAP canister purge
valve 2P connector terminal No. 2 and body ground.
Repair short in the wire between the EVAP
canister purge valve and the PCM (A6).
Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
11. Disconnect both vacuum hoses from the EVAP two
way valve (A), and connect a vacuum pump to the
canister port on the two way valve.
12. Turn the bypass solenoid valve on with the HDS, or
connect PCM connector terminal A3 to body
ground with a jumper wire.
13. Turn the ignition switch ON (II).
14. Apply vacuum to the hose.
Go to step 15.
Go to step 20.
15. Turn the ignition switch OFF.
16. Disconnect the EVAP bypass solenoid valve 2P
connector.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
Does the valve hold vacuum?
03/07/29 09:26:12 61S0X050_110_0279
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11
*01
08
05
YES
NO
YES
NO
YES
NO
11-280
EVAP System
DTC Troubleshooting (cont’d)
EVAP BYPASS SOLENOID
VALVE 2P CONNECTOR
2WBS (BLU)
EVAP BYPASS SOLENOID
VALVE 2P CONNECTOR
IG1 (BLK/YEL)
A
B
A
A973X-041-XXXXX
17. Check for continuity continuity between EVAP
bypass solenoid valve 2P connector terminal No. 2
and body ground.
Go to step 18.
Repair open in the wire between the EVAP
bypass solenoid valve and the PCM (A3).
18. Turn the ignition switch ON (II).
19. Measure voltage between EVAP bypass solenoid
valve 2P connector terminal No. 1 and body ground.
Replace the EVAP bypass solenoid valve (A)
and the O-rings (B).
Repair open in the wire between the EVAP
bypass solenoid valve and No. 6 ECU (PCM)
CRUISE CONTROL (15A) fuse.
20. Plug the upper port (A) of the EVAP two way valve.
21. While monitoring the FTP sensor voltage with the
HDS, or while measuring the voltage between PCM
connector terminals A29 and C18, slowly pump the
vacuum pump until the voltage drops to about
1.5 V.
The EVAP bypass solenoid valve/EVAP two
way valve is OK. Go to step 22.
Repair leakage from the EVAP bypass
solenoid valve, EVAP two way valve, FTP sensor, or
O-rings.
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e batter y voltage?
Does the voltage dr op to 1.5 V and hold f or at
least 20 seconds?
03/07/29 09:26:13 61S0X050_110_0280
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06
07
08
09
EVAP Canister Vent Shut Valve Test
YES
NO
YES
NO
YES
NO
11-281
A
A973X-041-XXXXX
EVAP CANISTER VENT
SHUT VALVE 2P CONNECTOR
VSV
(LT GRN/WHT)
B
A
EVAP CANISTER VENT
SHUT VALVE 2P CONNECTOR
VSV
(LT GRN/WHT)
22. Disconnect the vacuum hose from the EVAP
canister filter (A), and connect a vacuum pump to
the hose.
23. Turn the ignition switch ON (II).
24. Apply vacuum to the hose with 5 strokes of the
pump.
Go to step 25.
The EVAP canister vent shut valve is OK. Go
to step 30.
25. Turn the ignition switch OFF.
26. Disconnect the EVAP canister vent valve 2P
connector.
27. Check for continuity between EVAP canister vent
shut valve 2P connector terminal No. 2 and body
ground.
Go to step 28.
Replace the EVAP canister vent shut valve (A)
and O-ring (B).
28. Disconnect PCM connector A (32P).
29. Check for continuity between EVAP canister vent
shut valve 2P connector terminal No. 2 and body
ground.
Repair short in the wire between the EVAP
canister vent shut valve and the PCM (A4).
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
Does the valve hold vacuum?
Is ther e continuity?
Is ther e continuity?
03/07/29 09:26:14 61S0X050_110_0281
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