Acura RL. Manual - part 240

1. Clear the DTC with the HDS.

2. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at

speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.

3. Turn the ignition switch to LOCK (0). Repeat step 2, then go to step 4.

4. Monitor the OBD STATUS for P0718 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the input shaft (mainshaft) speed sensor and the PCM. If the HDS indicates NOT COMPLETED, return
to step 2 and recheck.

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

6. Disconnect the input shaft (mainshaft) speed sensor connector, and inspect the connector and connector

terminals to be sure they are making good contact.

Are the connector terminals OK?

YES - Go to step 7.

NO - Repair the connector terminals, then go to step 7.

7. Connect the input shaft (mainshaft) speed sensor connector.

8. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at

speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.

9. Turn the ignition switch to LOCK (0). Repeat step 8, then go to step 10.

10. Monitor the OBD STATUS for P0718 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?

YES - Go to step 11.

NO - The troubleshooting is complete. If the HDS indicates NOT COMPLETED, return to step 8 and
recheck.

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

12. Jump the SCS line with the HDS.

13. Disconnect PCM connector D(17P).

14. Disconnect the input shaft (mainshaft) speed sensor connector.

by a mechanical problem in the transmission.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:11 PM

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15. Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 2 and body

ground.

Fig. 104: Checking Continuity Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal
No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between PCM connector terminal D8 and the input shaft (mainshaft) speed
sensor connector, then go to step 28.

NO - Go to step 16.

16. Connect PCM connector D(17P).

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

18. Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 2 and body

ground.

Fig. 105: Measuring Voltage Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal
No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 132

YES - Replace the input shaft (mainshaft) speed sensor (see INPUT SHAFT (MAINSHAFT) SPEED
SENSOR REPLACEMENT ), then go to step 28.

NO - Go to step 19.

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

20. Disconnect PCM connector D (17P).

21. Check for continuity between PCM connector terminal D8 and input shaft (mainshaft) speed sensor

connector terminal No. 2.

Fig. 106: Checking Continuity Between PCM Terminal D8 And Input Shaft (Mainshaft) Speed
Sensor Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 22.

NO - Repair open in the wire between PCM connector terminal D8 and the input shaft (mainshaft) speed
sensor, then go to step 28.

22. Reconnect all connectors.

23. 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 ).

24. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at

speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.

25. Turn the ignition switch to LOCK (0). Repeat step 24, then go to step 26.

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

Is DTC P0718 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 27.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:12 PM

Page 133

27. Monitor the OBD STATUS for P0718 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 26, go to the
INDICATED DTCS TROUBLESHOOTING.

NO - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor 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 24 and recheck.

28. Reconnect all connectors.

29. Clear the DTC with the HDS.

30. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at

speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.

31. Turn the ignition switch to LOCK (0). Repeat step 30, then go to step 32.

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

Is DTC P0718 indicated?

YES - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor and the
PCM, then go to step 1.

NO - Go to step 33.

33. Monitor the OBD STATUS for P0718 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 32, go to the INDICATED
DTCS TROUBLESHOOTING.

NO - Check for poor connections and loose terminals at the input shaft (mainshaft) speed sensor and the
PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 30 and recheck.

DTC P0721: Problem in Output Shaft (Countershaft) Speed Sensor Circuit; DTC P0722: Problem in Output Shaft
(Countershaft) Speed Sensor Circuit (No Signal Input)

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

Friday, June 05, 2009 1:18:12 PM

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