Acura RL. Manual - part 266

Connector Terminal No. 4 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 13. 

NO - Repair open in the wire between PCM connector terminal C8 and the shift solenoid harness 
connector, then go to step 20. 

13. Remove the shift solenoid harness connector (see SHIFT SOLENOID VALVE TEST AND 

REPLACEMENT ).  

14. Check for continuity between shift solenoid harness connector terminal No. 4 and the shift solenoid valve 

B connector terminal. 

Fig. 172: Checking Continuity Between Shift Solenoid Terminal No. 4 And Shift Solenoid Valve B 
Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Replace shift solenoid valve B (see SHIFT SOLENOID VALVE TEST AND 
REPLACEMENT ), then go to step 20. 

NO - Replace the shift solenoid harness (see SHIFT SOLENOID VALVE TEST AND 
REPLACEMENT ), then go to step 20. 

15. Connect PCM connectors A (31P), B(24P), and C (22P).  

16. 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 ).  

17. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Run the vehicle in 3rd or 

4th gear at least 1 second, then slow down to a stop.  

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

Is DTC P0977 indicated?  

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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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 19. 

19. Monitor the OBD STATUS for P0977 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 18, go to the 
INDICATED DTCS TROUBLESHOOTING. 

NO - Check for poor connections and loose terminals at shift solenoid valve B 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 17 and 
recheck. 

20. Clear the DTC with the HDS.  

21. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Run the vehicle in 3rd or 

4th gear at least 1 second, then slow down to a stop.  

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

Is DTC P0977 indicated?  

YES - Check for poor connections and loose terminals at shift solenoid valve B and the PCM, then go to 
step 1. 

NO - Go to step 23. 

23. Monitor the OBD STATUS for P0977 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 shift solenoid valve B and the PCM, then go to 
step 1. If the HDS indicates NOT COMPLETED, return to step 

21

 and recheck. 

DTC P0979: Short in Shift Solenoid Valve C Circuit 

NOTE:



Before you troubleshoot, record all freeze data and any on-board 
snapshot, and review General Troubleshooting Information (see GENERAL 
TROUBLESHOOTING INFORMATION ).  

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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1. Clear the DTC with the HDS.  

2. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.  

3. Check that DTC P0979 recurs. 

Is DTC P0979 indicated?  

YES - Go to step 7. 

NO - Go to step 4. 

4. Select Shift Solenoid C in Miscellaneous Test Menu, and test shift solenoid valve C with the HDS. 

Is a clicking sound heard?  

YES - Go to step 5. 

NO - Go to step 7. 

5. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.  

6. Monitor the OBD STATUS for P0979 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 the SH C wire for an intermittent short 
between shift solenoid valve C and the PCM. If the HDS indicates NOT COMPLETED, return to step 4 
and recheck. 

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

8. Jump the SCS line with the HDS.  

9. Disconnect PCM connectors A (31P), B (24P), and C (22P).  

10. Measure the resistance between PCM connector terminals C16 and A3 or B15. 



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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Fig. 173: Measuring Resistance Between PCM Connector Terminals C16 And A3 Or B15 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there less than 12 ohms?  

YES - Go to step 11. 

NO - Go to step 18. 

11. Disconnect shift solenoid harness connector at the transmission housing.  

12. Check for continuity between PCM connector terminals C16 and A3 or B15. 

Fig. 174: Checking Continuity Between PCM Connector Terminals C16 And A3 Or B15 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between PCM connector terminal C16 and the shift solenoid harness 
connector, then go to step 23. 

NO - Go to step 13. 

13. Inspect shift solenoid valve C (see SHIFT SOLENOID VALVE TEST AND REPLACEMENT ). 

Is shift solenoid valve C OK?  

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:13 PM

Page 238 

© 2005 Mitchell Repair Information Company, LLC.