Acura TSX / Honda Accord CL. Manual - part 987

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Shift Valves B or C Stuck  

1. Warm up the engine to normal operating temperature (the radiator fan comes on).  

2. Check to be sure that the transmission is filled to the proper level, and check for fluid leaks.  

3. Drain the ATF (see DRAINING & REFILLING ) through a strainer. Inspect the ATF and strainer for 

metal debris or burnt fluid. 

Has the ATF deteriorated? 

YES: Replace ATF (see DRAINING & REFILLING ), and go to step 4.  

NO: Go to step 8 .  

4. Clear the DTC with the HDS.  

5. Test-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 20 

seconds, then slow down to a stop.  

6. Retest-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 

20 seconds, then slow down to a stop.  

7. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P1734. 

Did the result indicate a fail? 

YES: Go to step 8.  

NO: Intermittent failure, the system is OK at this time, if the tester indicates NOT 
COMPLETE, return to step 5 and recheck.  

8. Clear the DTC with the HDS.  

9. Select SHIFT SOL TEST in MISC. TEST MENU, then carry out A/T SHIFT SOL B test in SHIFT SOL 

TEST MENU with the HDS. 

Is a clicking sound heard? 

YES: Go to step 10.  

NO: Replace shift solenoid valve B (see SHIFT SOLENOID VALVE 
REPLACEMENT ), then go to step 14 .  

10. Select SHIFT SOL TEST in MISC. TEST MENU, then carry out A/T SHIFT SOL C test in SHIFT SOL 

TEST MENU with the HDS. 

Is a clicking sound heard? 

YES: Go to step 11.  

NO: Replace shift solenoid valve C (see SHIFT SOLENOID VALVE 
REPLACEMENT ), then go to step 14 .  

11. Test-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 20 

seconds, then slow down to a stop.  

12. Retest-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 

20 seconds, then slow down to a stop.  

13. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P1734. 

NOTE:

Record all freeze data and review General Troubleshooting Information (see 
GENERAL TROUBLESHOOTING INFORMATION ) before you troubleshoot.

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Did the result indicate a fail? 

YES: Repair hydraulic system related with shift valves B and C, or replace the transmission, 
then go to step 14.  

NO: Intermittent failure, the system is OK at this time. If the tester indicates NOT 
COMPLETE, return to step 11 and recheck.  

14. Clear the DTC with the HDS.  

15. Test-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 20 

seconds, then slow down to a stop.  

16. Retest-drive the vehicle in the D position in all five gears at speeds over 12 mph (20 km/h) for more than 

20 seconds, then slow down to a stop.  

17. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P1734. 

Did the result indicate a pass? 

YES: The problem has been corrected.  

NO: Return to step 1 and recheck.  

ROAD TEST 

1. Warm up the engine to normal operating temperature (the radiator fan comes on).  

2. Apply the parking brake, and block both rear wheels. Start the engine, then shift to the D position while 

pressing the brake pedal. Press the accelerator pedal, and release it suddenly. The engine should not stall. 

3. Repeat step 2 in the D

3

 position.  

4. Connect the HDS to the DLC (A), and go to the A/T data list. 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 206: Connecting The HDS To The DLC 

5. Test-drive the vehicle on a flat road in the D position. Check for abnormal noise and clutch slippage. 

While driving, check that the shift points occur at the proper speeds by monitoring the throttle position 
sensor voltage with the HDS and comparing your shift point speeds and voltage to those in the table. (The 
throttle position sensor voltage represents the throttle opening.) 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 207: D Position Upshift Table 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed