Acura RL. Instruction — page 255

Fig. 133: Measuring Voltage Between PCM Connector Terminal C20 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 C20 and the 4th clutch transmission
fluid pressure switch, then go to step 17.

NO — Go to step 12.

12. Connect the 4th 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 4th gear in M for at least 2 seconds, then upshift to 5th gear, and drive in 5th

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 P0873 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 P0873 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 4th 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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2005-08 TRANSMISSION Automatic Transmission — RL

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return to step 14 and recheck.

17. Clear the DTC with the HDS.

18. Test-drive the vehicle in 4th gear in M for at least 2 seconds, then upshift to 5th gear, and drive in 5th

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 P0873 indicated?

YES — Check for poor connections and loose terminals at the 4th clutch transmission fluid pressure switch
and the PCM, then go to step 1.

NO — Go to step 20.

20. Monitor the OBD STATUS for P0873 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 4th 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 P0957: Short in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck ON

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

2. Verify the transmission gear selection switch sequential sportshift mode switch signal inputs with the

HDS in the A/T data list.

Is sequential sportshift mode SW ON?

YES — Go to step 3.

NO — Intermittent failure, the system is OK at this time. Check the S-MODE wire for an intermittent short
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

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.

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2005-08 TRANSMISSION Automatic Transmission — RL

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connector.

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

6. Verify the transmission gear selection switch sequential sportshift mode switch signal inputs with the

HDS in the A/T data list.

Is sequential sportshift mode 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. 3 and body ground.

Fig. 134: Checking Continuity Between Transmission Gear Selection Switch Connector Terminal
No. 3 And Body Ground

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Repair short in the wire between PCM connector terminal E30 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.

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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 P0957 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 P0957 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 DTC’S 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.

Is DTC P0957 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 P0957 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
DTC’S TROUBLESHOOTING
.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission — RL

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