Honda Civic. Manual — part 211

17. Test-drive the vehicle with the shift lever in R at speeds below 3 mph (5 km/h)

for at least 2 seconds. Then increase the speed and drive over 3 mph (5 km/h)
for at least 2 seconds.

18. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 17, then go

to step 19.

19. Check for DTCs with the HDS.

Is DTC P0812 indicated?

YES -Check for poor connections or loose terminals between the transmission
range switch and the PCM. If the PCM was updated, substitute a known-good
PCM (see SUBSTITUTING THE PCM ), then go to step 17. If the PCM was
substituted, go to step 1.

NO -Go to step 20.

20. Monitor the OBD STATUS for P0812 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 19, go to the INDICATED DTC'S
TROUBLESHOOTING.

NO -If the HDS indicates FAILED, check for poor connections or loose
terminals between the transmission range switch and the PCM. If the PCM was
updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ),
then go to step 17. If the PCM was substituted, go to step 1. If the HDS
indicates NOT COMPLETED, go to step 17.

DTC P0842: Short in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid
Pressure Switch Stuck ON

NOTE:

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

2008 Honda Civic LX

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check the 2nd PRESSURE SWITCH in the DATA LIST with the HDS when

not in 2nd gear.

Is the 2nd PRESSURE SWITCH OFF?

YES -Go to step 4.

NO -Go to step 7.

4. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

5. Test-drive the vehicle in 3rd gear with the shift lever in D, for at least 2

seconds.

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

Does the HDS indicate FAILED?

YES -Go to step 7.

NO -If the HDS indicates PASSED, intermittent failure, the system is OK at
this time. Check for intermittent short to body ground in the wire between the
2nd clutch transmission fluid pressure switch and the PCM. If the HDS
indicates NOT COMPLETED, go to step 4.

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

10. Check the 2nd PRESSURE SWITCH in the DATA LIST with the HDS.

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)

Is the 2nd PRESSURE SWITCH OFF?

YES -Replace the 2nd clutch transmission fluid pressure switch (see 2ND
CLUTCH TRANSMISSION FLUID PRESSURE SWITCH
REPLACEMENT ), then go to step 15.

NO -Go to step 11.

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

Fig. 121: Checking Continuity Between PCM Connector Terminal B8 And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short to body ground in the wire between PCM connector
terminal B8 and the 2nd clutch transmission fluid pressure switch, then go to
step 15.

NO -Go to step 22.

15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Clear the DTC with the HDS.

2008 Honda Civic LX

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

18. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

19. Test-drive the vehicle with the shift lever in 2 for at least 2 seconds, then shift

to D, and drive in 3rd gear for at least 2 seconds. Then drive in 4th gear for at
least 2 seconds.

20. Check for DTCs with the HDS.

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, then go to step 1.

NO -Go to step 21.

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

Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other DTCs were indicated in step
20, 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, then go to step 1. If the HDS indicates NOT COMPLETED, go to step
18.

22. Update the PCM if it does not have the latest software (see UPDATING THE

PCM ), or substitute a known-good PCM (see SUBSTITUTING THE
PCM ).

23. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

24. Test-drive the vehicle with the shift lever in 2 for at least 2 seconds, then shift

to D, and drive in 3rd gear for at least 2 seconds. Then drive in 4th gear for at
least 2 seconds.

25. Check for DTCs with the HDS.

2008 Honda Civic LX

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