Acura RL. Manual - part 251

YES - If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ),
then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 17.

17. Monitor the OBD STATUS for P0816 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other DTCs were indicated on step 16, go to the
INDICATED DTCS TROUBLESHOOTING.

NO - Check for poor connections and loose terminals at the transmission gear selection switch and the
PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then
recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, return step
13 and recheck.

18. Clear the DTC with the HDS.

19. Start the engine in P, wait for at least 10 seconds, then shift to M.

20. Push the shift lever toward the upshift position (+) slowly, and release it; repeat this test at least 10 times.

21. Pull the shift lever toward the downshift position (-) slowly, and release it; repeat this test at least 10

times.

22. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0816 indicated?

YES - Check for poor connections and loose terminals at the transmission gear selection switch and the
PCM, then go to step 1.

NO - Go to step 23.

23. Monitor the OBD STATUS for P0816 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES - Troubleshooting is complete. If any other DTCs were indicated on step 22, go to the INDICATED
DTCS TROUBLESHOOTING.

NO - Check for poor connections and loose terminals at the transmission gear selection switch and the
PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 19 and recheck.

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

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 175

1. Clear the DTC with the HDS.

2. Check the 2nd PRESSURE SWITCH signal with the HDS in the A/T data list when not in 2nd gear.

Is the 2nd PRESSURE SWITCH OFF?

YES - Go to step 3.

NO - Go to step 6.

3. Start the engine and warm it up to normal operating temperature (the radiator fan comes on).

4. Test-drive the vehicle in 3rd gear in M for at least 2 seconds, then slow down to a stop.

5. Monitor the OBD STATUS for P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?

YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time. Check the 0P2SW wire for an intermittent short
between the 2nd clutch transmission fluid pressure switch and the PCM. If the HDS indicates NOT
COMPLETED, return to step

and recheck.

6. Turn the ignition switch to LOCK (0).

7. Disconnect the 2nd clutch transmission fluid pressure switch connector.

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

9. Check the 2nd PRESSURE SWITCH signal with the HDS in the A/T data list.

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 19.

NO - Go to step 10.

10. Turn the ignition switch to LOCK (0).

11. Jump the SCS line with the HDS.

12. Disconnect PCM connector C (22P).

13. Check for continuity between PCM connector terminal C11 and body ground.

NOTE:



Before you troubleshoot, record all freeze data and any on-board
snapshot, 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.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 176

Fig. 125: Checking Continuity Between PCM Connector Terminal C11 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between PCM connector terminal C11 and the 2nd clutch transmission
fluid pressure Switch, then go to step 19.

NO - Go to step 14.

14. Reconnect all connectors.

15. Update the A/T software in the PCM if it does not have the latest software (see UPDATING THE

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

16. Test-drive the vehicle in 2nd gear in M for at least 2 seconds, then upshift to 4th gear, and drive in 4th

gear for at least 2 seconds. Slow down and stop the wheels.

17. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0842 indicated?

YES - If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ),
then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 18.

18. Monitor the OBD STATUS for P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

NO - Check for poor connections and loose terminals at 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 recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED,

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 177

return to step 16 and recheck.

19. Clear the DTC with the HDS.

20. Test-drive the vehicle in 2nd gear in M for at least 2 seconds, then upshift to 4th gear, and drive in 4th

gear for at least 2 seconds. Slow down and stop the wheels.

21. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0842 indicated?

YES - Check for poor connections and loose terminals at 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 P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES - Troubleshooting is complete. If any other DTCs were indicated on step 21, go to the INDICATED
DTCS TROUBLESHOOTING.

NO - Check for poor connections and loose terminals at the 2nd clutch transmission fluid pressure switch
and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 20 and recheck.

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

1. Clear the DTC with the HDS.

2. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).

3. Shift into M while pressing the brake pedal, upshift to 2nd gear by pushing the shift lever toward the

upshift position (+) or pulling the paddle shifter + (upshift switch), and verify with the HDS in the A/T
data list that the SHIFT COMMAND indicates 2nd.

4. Check the 2nd PRESSURE SWITCH signal with the HDS in the A/T data list.

Is the 2nd PRESSURE SWITCH ON?

YES - Go to step 5.

NO - Go to step 7.

NOTE:



Before you troubleshoot, record all freeze data and any on-board
snapshot, 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.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 178

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