Honda Civic. Manual — part 212

Is DTC P0842 indicated?

YES -Check for intermittent short to body ground in the wire between the 2nd
clutch transmission fluid pressure switch and the PCM. If the PCM was
updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ),
then go to step 23. If the PCM was substituted, go to step 1.

NO -Go to step 26.

26. Monitor the OBD STATUS for P0842 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was
substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If
any other DTCs were indicated in step 25, go to the INDICATED DTC'S
TROUBLESHOOTING.

NO -If the HDS indicates FAILED, check for intermittent short to body ground
in the wire between the 2nd clutch transmission fluid pressure switch and the
PCM. If the PCM was updated, substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then go to step 23. If the PCM was
substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step
23.

DTC P0843: Open in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid
Pressure Switch Stuck OFF

1. Turn the ignition switch to ON (II).

NOTE:

Before you troubleshoot, record all freeze data and any
on-board snapshot with the HDS, and review General
Troubleshooting Information (see GENERAL
TROUBLESHOOTING INFORMATION ).

This code is caused by an electrical circuit problem and
cannot be caused by a mechanical problem in the
transmission.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

2. Clear the DTC with the HDS.
3. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

4. Shift the shift lever into 2.
5. Check the 2nd PRESSURE SWITCH in the DATA LIST with the HDS.

Is the 2nd PRESSURE SWITCH ON?

YES -Go to step 6.

NO -Go to step 8.

6. Test-drive the vehicle with the shift lever in 2 for at least 2 seconds.
7. Monitor the OBD STATUS for P0843 in the DTCs MENU with the HDS.

Does the HDS indicate FAILED?

YES -Go to step 8.

NO -If the HDS indicates PASSED, intermittent failure, the system is OK at
this time. Check for poor connections or loose terminals between the 2nd
clutch transmission fluid pressure switch and the PCM. If the HDS indicates
NOT COMPLETED, go to step 6.

8. Turn the ignition switch to LOCK (0).
9. Disconnect the 2nd clutch transmission fluid pressure switch connector.

10. Turn the ignition switch to ON (II).
11. Measure the voltage between the 2nd clutch transmission fluid pressure switch

connector terminal and body ground.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Fig. 122: Measuring Voltage Between 2nd Clutch Transmission Fluid
Pressure Switch Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Replace the 2nd clutch transmission fluid pressure switch (see 2ND
CLUTCH TRANSMISSION FLUID PRESSURE SWITCH
REPLACEMENT ), then go to step 16.

NO -Go to step 12.

12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check for continuity between PCM connector terminal B8 and the 2nd clutch

transmission fluid pressure switch connector terminal.

Fig. 123: Checking Continuity Between PCM Terminal B8 And 2nd
Clutch Transmission Fluid Pressure Switch Terminal

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 23.

NO -Repair open in the wire between PCM connector terminal B8 and the 2nd
clutch transmission fluid pressure switch, then go to step 16.

16. Reconnect all connectors.
17. Turn the ignition switch to ON (II).
18. Clear the DTC with the HDS.
19. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

20. Drive the vehicle with the shift lever in 2 for at least 2 seconds, then shift to D,

and drive in 4th gear for at least 2 seconds.

21. Check for DTCs with the HDS.

Is DTC P0843 indicated?

YES -Check for poor connections or loose terminals between the 2nd clutch
transmission fluid pressure switch and the PCM, then go to step 1.

NO -Go to step 22.

22. Monitor the OBD STATUS for P0843 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other DTCs were indicated in step
21, go to the INDICATED DTC'S TROUBLESHOOTING.

NO -If the HDS indicates FAILED, check for poor connections or loose
terminals between the 2nd clutch transmission fluid pressure switch and the
PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step
19.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)