Acura RL. Manual - part 250

1. Start the engine in P, and wait for at least 10 seconds.  

2. Verify the transmission gear selection switch upshift switch signal input with the HDS in the A/T data 

list. 

Is UPSHIFT SW ON?  

YES - Go to step 3. 

NO - Intermittent failure, the system is OK at this time. Check the S-UP wire for an intermittent short to 
ground between the transmission gear selection switch and the PCM. 

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

4. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light 

connector at the shift lever bracket.  

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

6. Verify the transmission gear selection switch upshift switch signal input with the HDS in the A/T data 

list. 

Is UPSHIFT SW ON?  

YES - Go to step 7. 

NO - Replace the transmission gear selection switch (see TRANSMISSION GEAR SELECTION 
SWITCH TEST ), then go to step 18. 

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

8. Jump the SCS line with the HDS.  

9. Disconnect PCM connector E (31P).  

10. Check for continuity between transmission gear selection switch/park pin switch/A/T gear position 

indicator panel light connector terminal No. 7 and body ground. 

Fig. 123: Checking Continuity Between Transmission Gear Selection Switch Connector Terminal 
No. 7 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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Is there continuity?  

YES - Repair short in the wire between PCM connector terminal E19 and the transmission gear selection 
switch, then go to step 18. 

NO - Go to step 11. 

11. Connect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light 

connector.  

12. 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 ).  

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

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

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

times.  

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

Is DTC P0815 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 17. 

17. Monitor the OBD STATUS for P0815 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 to 
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. 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:12 PM

Page 172 

© 2005 Mitchell Repair Information Company, LLC. 

Is DTC P0815 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 P0815 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 P0816: Short in Transmission Gear Selection Switch Downshift Switch Circuit, or Transmission Gear Selection 
Switch Downshift Switch Stuck ON 

1. Start the engine in P, and wait for at least 10 seconds.  

2. Verify the transmission gear selection switch downshift switch signal input with the HDS in the A/T data 

list. 

Is DOWNSHIFT SW ON?  

YES - Go to step 3. 

NO - Intermittent failure, the system is OK at this time. Check the S-DN wire for an intermittent short to 
ground between the transmission gear selection switch and the PCM. 

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

4. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light 

connector at the shift lever bracket.  

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

6. Verify the transmission gear selection switch downshift switch signal input with the HDS in the A/T data 

list. 

Is DOWNSHIFT SW ON?  

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

  

me 

 

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Page 173 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Go to step 7. 

NO - Replace the transmission gear selection switch (see TRANSMISSION GEAR SELECTION 
SWITCH TEST ), then go to step 18. 

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

8. Jump the SCS line with the HDS.  

9. Disconnect PCM connector E (31P).  

10. Check for continuity between transmission gear selection switch/park pin switch/A/T gear position 

indicator panel light connector terminal No. 8 and body ground. 

Fig. 124: Checking Continuity Between Transmission Gear Selection Switch Connector Terminal 
No. 8 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between PCM connector terminal E13 and the transmission gear selection 
switch, then go to step 18. 

NO - Go to step 11. 

11. Connect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light 

connector.  

12. 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 ).  

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

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

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

times.  

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

Is DTC P0816 indicated?  

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:12 PM

Page 174 

© 2005 Mitchell Repair Information Company, LLC.