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