Acura RL. Manual - part 252

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

6. Monitor the OBD STATUS for P0843 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?

YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the 2nd clutch transmission fluid pressure switch and the PCM. If the HDS indicates NOT
COMPLETED, return to step 5 and recheck.

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. Measure the voltage between the 2nd clutch transmission fluid pressure switch connector terminal and

body ground.

Fig. 126: 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 17.

NO - Go to step 11.

11. Measure the voltage between PCM connector terminal C11 and body ground.

2007 Acura RL

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Fig. 127: Measuring Voltage Between PCM Connector Terminal C11 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Repair open in the wire between PCM connector terminal C11 and the 2nd clutch transmission
fluid pressure switch, then go to step 17.

NO - Go to step 12.

12. Connect the 2nd clutch transmission fluid pressure switch connector.

13. 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 ).

14. 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.

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

Is DTC P0843 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 16.

16. Monitor the OBD STATUS for P0843 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 15, go to the
INDICATED DTC'S TROUBLESHOOTING.

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,

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return to step 14 and recheck.

17. Clear the DTC with the HDS.

18. 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.

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

Is DTC P0843 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 20.

20. Monitor the OBD STATUS for P0843 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 19, 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 18 and recheck.

DTC P0847: Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid
Pressure Switch Stuck ON

1. Clear the DTC with the HDS.

2. Check the 3rd PRESSURE SWITCH signal with the HDS in the A/T data list when not in 3rd gear.

Is the 3rd 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 4th gear in M for at least 2 seconds, then slow down to a stop.

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

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5. Monitor the OBD STATUS for P0847 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 0P3SW wire for an intermittent short
between the 3rd 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 3rd clutch transmission fluid pressure switch connector.

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

9. Check the 3rd PRESSURE SWITCH signal with the HDS in the A/T data list.

Is the 3rd PRESSURE SWITCH OFF?

YES - Replace the 3rd clutch transmission fluid pressure switch (see 3RD 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 C9 and body ground.

Fig. 128: Checking Continuity Between PCM Connector Terminal C9 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between PCM connector terminal C9 and the 3rd clutch transmission fluid
pressure switch, then go to step 19.

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