Acura TSX / Honda Accord CL. Manual — part 954

Fig. 126: Measuring The Voltage Between PCM Connector Terminals C19 & A8 Or A9

24. Measure the voltage between PCM connector terminals A21 and A8 or A9.

Is there 4.75 V-5.25 V?

YES: Repair open in the wire between PCM connector terminal A21 and the mainshaft speed
sensor connector, then go to step 30 .

NO: Go to step 25.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 127: Measuring The Voltage Between PCM Connector Terminals A21 & A8 Or A9

25. Turn the ignition switch OFF.

26. Jump the SCS line with the HDS.

27. Disconnect PCM connector A (31P).

28. Check for continuity between PCM connector terminal A21 and body ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal A21 and the
mainshaft speed sensor connector, then go to step 30 .

NO: Check for loose or poor connections at PCM connector terminal A21. If the connection
is OK, update the PCM if it does not have the latest software, or substitute a known-good
PCM (see PCM UPDATING & SUBSTITUTION FOR TESTING ), then recheck. If the
symptom/indication goes away with a known-good PCM, replace the original PCM.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 128: Checking For Continuity Between PCM Connector Terminal A21 & Body Ground

29. Measure the voltage between PCM connector terminals C19 and A8 or A9.

Is there about 5 V?

YES: Repair open in the wire between PCM connector terminal C19 and the mainshaft speed
sensor connector, then go to step 30.

NO: Check for loose or poor connections at PCM connector terminal C19. If the connection
is OK, update the PCM if it does not have the latest software, or substitute a known-good
PCM (see PCM UPDATING & SUBSTITUTION FOR TESTING ), then recheck. If the

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

symptom/indication goes away with a known-good PCM, replace the original PCM.

Fig. 129: Measuring The Voltage Between PCM Connector Terminals C19 & A8 Or A9

30. Clear the DTC with the HDS.

31. Test-drive the vehicle for several minutes under the same conditions as those indicated by the freeze data.

32. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0717.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0718: MAINSHAFT SPEED SENSOR INTERMITTENT FAILURE

1. Clear the DTC with the HDS.

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

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