Acura RL. Manual - part 253

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 3rd 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 P0847 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 P0847 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 17, go to the 
INDICATED DTC'S TROUBLESHOOTING. 

NO - Check for poor connections and loose terminals at the 3rd 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, 
return to step 16 and recheck. 

19. Clear the DTC with the HDS.  

20. Test-drive the vehicle in 3rd 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 P0847 indicated?  

YES - Check for poor connections and loose terminals at the 3rd clutch transmission fluid pressure 
switch and the PCM, then go to step 1. 

NO - Go to step 22. 

22. Monitor the OBD STATUS for P0847 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail. 

Does the HDS indicate PASSED?  

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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

NO - Check for poor connections and loose terminals at the 3rd 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 P0848: Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd 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. Test-drive the vehicle in 3rd gear in M, and verify with the HDS in the A/T data list that the SHIFT 

COMMAND indicates 3rd.  

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

Is the 3rd PRESSURE SWITCH ON?  

YES - Go to step 5. 

NO - Go to step 7. 

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

6. Monitor the OBD STATUS for P0848 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 3rd 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 3rd clutch transmission fluid pressure switch connector.  

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

10. Measure the voltage between the 3rd clutch transmission fluid pressure switch connector terminal 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

  

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Page 184 

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Fig. 129: Measuring Voltage Between 3rd 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 3rd clutch transmission fluid pressure switch (see 3RD CLUTCH TRANSMISSION 
FLUID PRESSURE SWITCH REPLACEMENT ), then go to step 17. 

NO - Go to step 11. 

11. Measure the voltage between PCM connector terminal C9 and body ground. 

Fig. 130: Measuring Voltage Between PCM Connector Terminal C9 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 C9 and the 3rd clutch transmission fluid 
pressure switch, then go to step 17. 

NO - Go to step 12. 

12. Connect the 3rd 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 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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

14. Test-drive the vehicle in 3rd 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 P0848 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 P0848 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 DTCS TROUBLESHOOTING. 

NO - Check for poor connections and loose terminals at the 3rd 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, 
return to step 14 and recheck. 

17. Clear the DTC with the HDS.  

18. Test-drive the vehicle in 3rd 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 P0848 indicated?  

YES - Check for poor connections and loose terminals at the 3rd clutch transmission fluid pressure 
switch and the PCM, then go to step 1. 

NO - Go to step 20. 

20. Monitor the OBD STATUS for P0848 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 3rd clutch transmission fluid pressure switch 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:12 PM

Page 186 

© 2005 Mitchell Repair Information Company, LLC.