Acura TSX / Honda Accord CL. Manual — part 951

REPLACEMENT ), then go to step 30 .

Fig. 115: Measuring The Voltage Between PCM Connector Terminals C19 & A8 Or A9

22. Shift to the P position. Start the engine, and let it idle.

23. With the engine idling, measure the voltage between PCM connector terminals C19 and A8 or A9.

Is there 1.5 V-3.5 V?

YES: 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.

NO: Replace the mainshaft speed sensor (see MAINSHAFT SPEED SENSOR
REPLACEMENT ), then go to step 30 .

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 116: 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. 117: 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. 118: 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