Acura TSX / Honda Accord CL. Manual - part 970

 

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Acura TSX / Honda Accord CL. Manual - part 970

 

 

1. Clear the DTC with the HDS.  

2. Check the 3rd PRES SWITCH signal with the HDS in the A/T data list when not in 3rd gear. 

Is the 3rd PRES SWITCH ON? 

YES: Go to step 3.  

NO: Go to step 5 .  

3. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the 

vehicle in 3rd gear in the M position for more than 5 seconds, then upshift to 4th gear, and drive in 4th 
gear for more than 5 seconds. Slow down to a stop.  

4. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0847. 

Did the result indicate a fail? 

YES: Go to step 5.  

NO: Intermittent failure, the system is OK at this time. Check the BLU/WHT wire for an 
intermittent short to ground between the 3rd clutch transmission fluid pressure switch and 
PCM. If the tester indicates NOT COMPLETE, return to step 3 and recheck.  

5. Turn the ignition switch OFF.  

6. Disconnect the 3rd clutch transmission fluid pressure switch connector.  

7. Turn the ignition switch ON (II).  

8. Check the 3rd PRES SWITCH signal with the HDS in the A/T data list. 

Is the 3rd PRES SWITCH OFF? 

YES: Replace the 3rd clutch transmission fluid pressure switch (see 3RD CLUTCH 
TRANSMISSION FLUID PRESSURE SWITCH REPLACEMENT
 ), go to step 13 .  

NO: Go to step 9.  

9. Turn the ignition switch OFF.  

10. Jump the SCS line with the HDS.  

11. Disconnect PCM connector C (22P).  

12. Check for continuity between PCM connector terminal C10 and body ground. 

Is there continuity? 

YES: Repair short to ground in the wire between PCM connector terminal C10 and the 3rd 
clutch transmission fluid pressure switch, go to step 13.  

NO: 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. 

NOTE:

z

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

z

This code is caused by an electrical circuit problem and cannot be caused 
by a mechanical problem in the transmission.  

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 164: Checking For Continuity Between PCM Connector Terminal C10 & Body Ground 

13. Clear the DTC with the HDS.  

14. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the 

vehicle in 3rd gear in the M position for more than 5 seconds, then upshift to 4th gear, and drive in 4th 
gear for more than 5 seconds. Slow down to a stop.  

15. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0847. 

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Did the result indicate a pass? 

YES: The problem has been corrected.  

NO: Return to step 1 and recheck.  

DTC P0848: OPEN IN 3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH CIRCUIT, OR 
3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH STUCK OFF 

1. Clear the DTC with the HDS.  

2. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the 

vehicle in the 3rd gear in the M position, and verify that the SHIFT MAP NUMBER indicates 3rd with 
the HDS in the A/T data list.  

3. Check the 3rd PRES SWITCH signal with the HDS in the A/T data list. 

Is the 3rd PRES SWITCH ON? 

YES: Go to step 4.  

NO: Go to step 6 .  

4. Drive the vehicle in 3rd gear in the M position for more than 5 seconds, then upshift to 4th gear, and 

drive in 4th gear for more than 5 seconds. Slow down to a stop.  

5. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0848. 

Did the result indicate a fail? 

YES: Go to step 6.  

NO: Intermittent failure, the system is OK at this time. Check for poor connections or loose 
terminals at the 3rd clutch transmission fluid pressure switch and PCM. If the tester indicates 
NOT COMPLETE, return to step 4 and recheck.  

6. Turn the ignition switch OFF.  

7. Disconnect the 3rd clutch transmission fluid pressure switch connector.  

8. Turn the ignition switch ON (II).  

9. Measure the voltage between the 3rd clutch transmission fluid pressure switch connector terminal and 

body ground. 

Is there about 5 V? 

YES: Replace the 3rd clutch transmission fluid pressure switch (see 3RD CLUTCH 
TRANSMISSION FLUID PRESSURE SWITCH REPLACEMENT
 ), then go to step 
11 .  

NO: Go to step 10.  

NOTE:

z

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

z

This code is caused by an electrical circuit problem and cannot be caused 
by a mechanical problem in the transmission.  

 

2004 Acura TSX 

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

  

 

Fig. 165: Measuring The Voltage Between The 3rd Clutch Transmission Fluid Pressure 
Switch Connector Terminal & Body Ground
 

10. Measure the voltage between PCM connector terminal C10 and body ground. 

Is there about 5 V? 

YES: Repair open in the wire between PCM connector terminal C10 and the 3rd clutch 
transmission fluid pressure switch, then go to step 11.  

NO: Check for loose or poor connections at PCM connector terminal C10. 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

  

 

 

 

 

 

 

 

 

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