Acura TSX / Honda Accord CL. Manual — part 971

Fig. 166: Measuring The Voltage Between PCM Connector Terminal C10 & Body Ground

11. Clear the DTC with the HDS.

12. 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.

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

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 P0957: SHORT IN TRANSMISSION GEAR SELECTION SWITCH CIRCUIT, OR
TRANSMISSION GEAR SELECTION SWITCH STUCK ON

1. Turn the ignition switch ON (II).

2. Shift to the P position.

3. Verify the transmission gear selection switch sequential sportshift mode switch inputs with the HDS in

the A/T data list.

Is sequential sportshift mode SW ON?

YES: Go to step 4.

NO: Intermittent failure, the system is OK at this time. Check the BRN wire for an
intermittent short to ground between the transmission gear selection switch and PCM.

4. Turn the ignition switch OFF.

5. Disconnect the transmission gear selection switch connector.

6. Turn the ignition switch ON (II).

7. Verify the transmission gear selection switch sequential sportshift mode switch inputs with the HDS in

the A/T data list.

Is sequential sportshift mode SW ON?

YES: Go to step 8.

NO: Replace the transmission gear selection switch (see Transmission Gear Selection
Switch Replacement ), then go to step 12 .

8. Turn the ignition switch OFF.

9. Jump the SCS line with the HDS.

10. Disconnect PCM connector D (17P).

11. Check for continuity between transmission gear selection switch connector terminal No. 3 and body

ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal D2 and the
transmission gear selection switch connector, then go to step 12.

NO: Check for loose or poor connections at PCM connector terminal D2. 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

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

symptom/indication goes away with a known-good PCM, replace the original PCM.

Fig. 167: Checking For Continuity Between Transmission Gear Selection Switch Connector
Terminal No. 3 & Body Ground

12. Clear the DTC with the HDS.

13. Start the engine in the P position, wait for more than 10 seconds, then shift to the M position.

14. Push the shift lever toward shiftup position (+) slowly, and return to neutral position; repeat this test 10

times or more.

15. Pull the shift lever toward shiftdown position (-) slowly, and return to neutral position; repeat this test 10

times or more.

16. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0957.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0958: OPEN IN TRANSMISSION GEAR SELECTION SWITCH CIRCUIT, OR

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

TRANSMISSION GEAR SELECTION SWITCH STUCK OFF

1. Turn the ignition switch ON (II).

2. Shift to the M position.

3. Verify the transmission gear selection switch sequential sportshift mode switch inputs with the HDS in

the A/T data list.

Is sequential sportshift mode SW OFF?

YES: Go to step 4.

NO: Intermittent failure, the system is OK at this time. Check for poor connections or loose
terminals at the transmission gear selection switch and PCM.

4. Turn the ignition switch OFF.

5. Disconnect the transmission gear selection switch connector.

6. Check for continuity between transmission gear selection switch connector terminals No. 2 and No. 3.

Is there continuity when the shift lever is in M position, and no continuity when the shift lever
is any other M position?

YES: Go to step 7.

NO: Replace the transmission gear selection switch (see Transmission Gear Selection
Switch Replacement ), then 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