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