Acura TSX / Honda Accord CL. Manual — part 953

Is there continuity?

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

NO: Go to step 16.

Fig. 122: Checking For Continuity Between Mainshaft Speed Sensor Connector Terminal No.
2 & Body Ground

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

16. Check for continuity between mainshaft speed sensor connector terminal No. 3 and body ground.

Is there continuity?

YES: Go to step 17.

NO: Repair open in the wire between the mainshaft speed sensor connector and ground
(G101), then go to step 30 .

Fig. 123: Checking For Continuity Between Mainshaft Speed Sensor Connector Terminal No.
3 & Body Ground

17. Connect PCM connector C (22P).

18. Turn the ignition switch ON (II).

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

19. Measure the voltage between mainshaft speed sensor connector terminals No. 2 and No. 3.

Is there about 5 V?

YES: Go to step 20.

NO: Go to step 29 .

Fig. 124: Measuring The Voltage Between Mainshaft Speed Sensor Connector Terminals No.
2 & No. 3

20. Connect the mainshaft speed sensor connector.

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

Is there 0 V or about 5 V?

YES: Go to step 22.

NO: Replace the mainshaft speed sensor (see MAINSHAFT SPEED SENSOR

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

REPLACEMENT ), then go to step 30 .

Fig. 125: 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