Acura RL. Instruction — page 242

connector terminals B19 and A3 or B15.

Fig. 113: Measuring Voltage Between PCM Connector Terminals B19 And A3 Or B15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 1.5-3.5 V?

YES — Go to step 32.

NO — Replace the output shaft (countershaft) speed sensor (see INPUT SHAFT (MAINSHAFT)
SPEED SENSOR REPLACEMENT
), then go to step 37.

26. Measure the voltage between PCM connector terminals B19 and A3 or B15.

Fig. 114: Measuring Voltage Between PCM Connector Terminals B19 And A3 Or B15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES — Repair open in the wire between PCM connector terminal B19 and the output shaft (countershaft)
speed sensor, then go to step 37.

NO — Go to step 32.

27. Measure the voltage between PCM connector terminals C6 and A3 or B15.

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Fig. 115: Measuring Voltage Between PCM Connector Terminals C6 And A3 Or B15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES — Repair open in the wire between PCM connector terminal C6 and the output shaft (countershaft)
speed sensor, then go to step 37.

NO — Go to step 28.

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

29. Jump the SCS line with the HDS.

30. Disconnect PCM connector C (22P).

31. Check for continuity between PCM connector terminal C6 and body ground.

Fig. 116: Checking Continuity Between PCM Connector Terminal C6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Repair short in the wire between PCM connector terminal C6 and the output shaft (countershaft)
speed sensor, then go to step 37.

NO — Go to step 32.

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32. Reconnect all connectors.

33. 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 ).

34. Start the engine. Run the vehicle in either 2nd, 3rd, 4th, or 5th gear (not 1st) in M (sequential sportshift

mode) with the engine speed at 2,000 rpm or higher for at least 10 seconds. Slow down and stop the
wheels.

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

Is DTC P0721 or P0722 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 36.

36. Monitor the OBD STATUS for P0721 or P0722 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 35, go to the
INDICATED DTC’S TROUBLESHOOTING.

NO — Check for poor connections and loose terminals at the output shaft (countershaft) 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 34 and recheck.

37. Reconnect all connectors.

38. Clear the DTC with the HDS.

39. Start the engine. Run the vehicle in either 2nd, 3rd, 4th, or 5th gear (not 1st) in M (sequential sportshift

mode) with the engine speed at 2,000 rpm or higher for at least 10 seconds. Slow down and stop the
wheels.

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

Is DTC P0721 or P0722 indicated?

YES — Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and
the PCM, then go to step 1.

NO — Go to step 41.

41. Monitor the OBD STATUS for P0721 or P0722 in the DTCs/Freeze Data in A/T Mode Menu for a

pass/fail.

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Does the HDS indicate PASSED?

YES — Troubleshooting is complete. If any other DTCs were indicated on step 40, go to the INDICATED
DTC’S TROUBLESHOOTING
.

NO — Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and
the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 39 and recheck.

DTC P0723: Output Shaft (Countershaft) Speed Sensor Intermittent Failure

1. Record all freeze data, and clear the DTC with the HDS.

2. Test-drive the vehicle for several minutes with the shift lever in D, and let the transmission shift through

all five gears under the same conditions as those indicated by the freeze data. Slow down and stop the
wheels.

3. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?

YES — Go to step 4.

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

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

5. Disconnect the output shaft (countershaft) 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 6.

NO — Repair the connector terminals, then go to step 6.

6. Connect the output shaft (countershaft) speed sensor connector.

7. Test-drive the vehicle for several minutes with the shift lever in D, and let the transmission shift through

all five gears under the same conditions as those indicated by the freeze data. Slow down and stop the
wheels.

8. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

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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