Acura TSX / Honda Accord CL. Manual — part 961

Fig. 151: Checking For Continuity Between PCM Connector Terminal A20 & Body Ground

29. Measure the voltage between PCM connector terminals A18 and A8 or A9.

Is there about 5 V?

YES: Repair open in the wire between PCM connector terminal A18 and the countershaft
speed sensor, then go to step 30.

NO: Check for loose or poor connections at PCM connector terminal A18. If the connection
is OK, update the PCM if it does not have the latest software, or substitute a known-good

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

PCM (see PCM UPDATING & SUBSTITUTION FOR TESTING ), then recheck. If the
symptom/indication goes away with a known-good PCM, replace the original PCM.

Fig. 152: Measuring The Voltage Between PCM Connector Terminals A18 & A8 Or A9

30. Clear the DTC with the HDS.

31. Test-drive the vehicle for several minutes in the D position in all five gears.

32. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0722.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0723: COUNTERSHAFT SPEED SENSOR INTERMITTENT FAILURE

NOTE:

z

Record all freeze data and review General Troubleshooting Information
(see GENERAL TROUBLESHOOTING INFORMATION ) before you
troubleshoot.

z

This code is caused by an electrical circuit problem and cannot be caused
by a mechanical problem in the transmission.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

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

2. Test-drive the vehicle for 10 minutes under the same conditions as those indicated by the freeze data, and

check the OBD STATUS in DTCs MENU for a pass/fail test of code P0723.

Did the result indicate a fail?

YES: Go to step 3.

NO: Intermittent failure, the system is OK at this time. Check for poor connections or loose
terminals at the countershaft speed sensor and PCM. If the tester indicates NOT
COMPLETE, return to step 2 and recheck.

3. Turn the ignition switch OFF.

4. Disconnect the 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 5.

NO: Repair the connector terminals, then go to step 5.

5. Connect the countershaft speed sensor connector.

6. Test-drive the vehicle for several minutes, and check the OBD STATUS in DTCs MENU for a pass/fail

test of code P0723.

Did the result indicate a fail?

YES: Go to step 7.

NO: The problem has been corrected. If the tester indicates NOT COMPLETE, return to step
6 and recheck.

7. Turn the ignition switch OFF.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (31P).

10. Disconnect the countershaft speed sensor connector.

11. Check for continuity between countershaft speed sensor connector terminal No. 2 and body ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal A18 and the
countershaft speed sensor, then go to step 18 .

NO: Go to step 12.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 153: Checking For Continuity Between Countershaft Speed Sensor Connector Terminal
No. 2 & Body Ground

12. Connect PCM connector A (31P).

13. Turn the ignition switch ON (II).

14. Measure the voltage between countershaft speed sensor connector terminal No. 2 and body ground.

Is there about 5 V?

YES: Replace the countershaft speed sensor (see COUNTERSHAFT SPEED SENSOR
REPLACEMENT ), then go to step 18 .

NO: Go to step 15.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed