Acura TSX / Honda Accord CL. Manual - part 957

Fig. 136: Checking For Continuity Between Countershaft Speed Sensor Connector Terminal 
No. 3 & Body Ground 

16. Connect PCM connector A (31P).  

17. Turn the ignition switch ON (II).  

18. Measure the voltage between countershaft speed sensor connector terminals No. 2 and No. 3. 

Is there about 5 V? 

YES: Go to step 19.  

NO: Go to step 28 .  

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 137: Measuring The Voltage Between Countershaft Speed Sensor Connector Terminals 
No. 2 & No. 3 

19. Connect countershaft speed sensor connector.  

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

Is there 0 V or about 5 V? 

YES: Go to step 21.  

NO: Replace the countershaft speed sensor (see COUNTERSHAFT SPEED SENSOR 
REPLACEMENT ), then go to step 29 . 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 138: Measuring The Voltage Between PCM Connector Terminals A18 & A8 Or A9 

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

22. 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 29 . 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 139: Measuring The Voltage Between PCM Connector Terminals A18 & A8 Or A9 

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

Is there 4.75 V-5.25 V? 

YES: Repair open in the wire between PCM connector A20 and the countershaft speed 
sensor, then go to step 29 .  

NO: Go to step 24.  

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed