Acura CSX. Manual — part 177
03
04
−
−
−
−
YES
NO
YES
NO
11-376
EVAP System
PCS (YEL/BLU)
EVAP CANISTER PURGE VALVE
2P CONNECTOR
IG1 (BLK/YEL)
EVAP CANISTER PURGE VALVE
2P CONNECTOR
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector B (44P).
13. 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 ECM/PCM (B3), then
go to step 24.
Go to step 30.
14. Turn the ignition switch to LOCK (0).
15. Disconnect the EVAP canister purge valve 2P
connector.
16. Turn the ignition switch to ON (II).
17. Measure the voltage between EVAP canister purge
valve 2P connector terminal No. 1 and body ground.
Go to step 18.
Repair open in the wire between the EVAP
canister purge valve and the No. 3 ALTERNATOR
(10 A) fuse in the under-dash fuse/relay box, then
go to step 24.
18. Turn the ignition switch to LOCK (0).
19. Jump the SCS line with the HDS.
20. Disconnect ECM/PCM connector B (44P).
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e batter y voltage?
08/08/21 14:32:33 61SNR030_110_0376
05
06
−
−
−
−
YES
NO
YES
NO
11-377
ECM/PCM CONNECTOR B (44P)
EVAP CANISTER PURGE VALVE
2P CONNECTOR
PCS (YEL/BLU)
PCS (YEL/BLU)
EVAP CANISTER PURGE VALVE
2P CONNECTOR
21. Check for continuity between ECM/PCM connector
terminal B3 and EVAP canister purge valve 2P
connector terminal No. 2.
Go to step 22.
Repair open in the wire between the EVAP
canister purge valve and the ECM/PCM (B3), then
go to step 24.
22. At the valve side, measure the resistance between
EVAP canister purge valve 2P connector terminals
No. 1 and No. 2.
Go to step 30.
Go to step 23.
23. Replace the EVAP canister purge valve (see page
11-409).
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II).
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/PCM idle learn procedure (see page
11-310).
Wire side of
female terminals
Terminal side of female terminals
Terminal side of male terminals
Is ther e continuity?
Is ther e about 25
at r oom temper atur e?
08/08/21 14:32:33 61SNR030_110_0377
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
11-378
EVAP System
28. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the EVAP canister purge valve and the
ECM/PCM, then go to step 1.
Go to step 29.
29. Monitor the OBD STATUS for DTC P0443 in the
DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 28,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the EVAP canister
purge valve and the ECM/PCM, then go to step 1. If
the screen indicates EXECUTING or OUT OF
CONDITION, keep idling until a result comes on.
30. Reconnect all connectors.
31. Update the ECM/PCM if it does not have the latest
software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
32. Start the engine, and let it idle.
33. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the EVAP canister purge valve and the
ECM/PCM. If the ECM/PCM was updated, substitute
a known-good ECM/PCM (see page 11-7), then go
to step 32. If the ECM/PCM was substituted, go to
step 1.
Go to step 34.
34. Monitor the OBD STATUS for DTC P0443 in the
DTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 33, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the EVAP canister
purge valve and the ECM/PCM. If the ECM/PCM
was updated, substitute a known-good ECM/PCM
(see page 11-7), then go to step 32. If the ECM/PCM
was substituted, go to step 1. If the screen indicates
EXECUTING or OUT OF CONDITION, keep idling
until a result comes on.
Is DT C P0443 indicated?
Does the scr een indicate PASSED?
Is DT C P0443 indicated?
Does the scr een indicate PASSED?
08/08/21 14:32:33 61SNR030_110_0378
SNR9AA7K72100090451FAAT30
−
−
−
−
−
−
DTC P0451:
YES
NO
YES
NO
YES
NO
11-379
FTP Sensor Circuit Range/
Performance Problem
NOTE:
• Before you troubleshoot, record all freeze data and
any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
• If DTC P2422 is stored at the same time as DTC P0451,
troubleshoot DTC P2422 first, then recheck for DTC
P0451.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle for 1 minute.
4. Monitor the OBD STATUS for DTC P0451 in the
DTCs MENU with the HDS.
Go to step 5.
If the screen indicates PASSED, intermittent
failure, the system is OK at this time. Check for
poor connections or loose terminals at the FTP
sensor and the ECM/PCM. If the screen indicates
NOT COMPLETED, keep idling until a result comes
on.
5. Turn the ignition switch to LOCK (0).
6. Replace the FTP sensor (see page 11-408).
7. Turn the ignition switch to ON (II).
8. Reset the ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure (see page
11-310).
10. Start the engine, then let it idle for 1 minute.
11. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the FTP sensor and the ECM/PCM, then
go to step 1.
Go to step 12.
12. Monitor the OBD STATUS for DTC P0451 in the
DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 11,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the FTP sensor
and the ECM/PCM, then go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a
result comes on.
Does the scr een indicate F AILED?
Is DT C P0451 indicated?
Does the scr een indicate PASSED?
08/08/21 14:32:33 61SNR030_110_0379
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