Acura TSX / Honda Accord CL. Manual — part 960

Fig. 147: Measuring The Voltage Between Countershaft Speed Sensor Connector Terminals
No. 2 & No. 3

20. Connect the countershaft speed sensor connector.

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

Is the voltage 0 V or about 5 V?

YES: Go to step 22.

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

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 148: Measuring The Voltage Between PCM Connector Terminals A18 & A8 Or A9

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

23. Shift to the D position, and measure the voltage between PCM connector terminals A18 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 countershaft speed sensor (see COUNTERSHAFT SPEED SENSOR
REPLACEMENT ), then go to step 30 .

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 149: Measuring The Voltage Between PCM Connector Terminals A18 & A8 Or A9

24. Measure the voltage between PCM connector terminals A20 and A8 or A9.

Is there about 5 V?

YES: Repair open in the wire between PCM connector terminal A20 and the countershaft
speed sensor, then go to step 30 .

NO: Go to step 25.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 150: Measuring The Voltage Between PCM Connector Terminals A20 & 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 A20 and body ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal A20 and the
countershaft speed sensor, then go to step 30 .

NO: Check for loose or poor connections at PCM connector terminal A20. 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