Acura TSX / Honda Accord CL. Manual — part 967

Fig. 156: Checking For Continuity Between PCM Connector Terminals A8 & Body Ground
& Between A9 & Body Ground

6. Turn the ignition switch ON (II).

7. Shift to the R position.

8. Measure the voltage between PCM connector terminals C12 and A8 or A9.

Is there voltage?

YES: Go to step 9.

NO: Check for loose or poor connections at PCM connector terminal C12. 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

Fig. 157: Measuring The Voltage Between PCM Connector Terminals C12 & A8 Or A9

9. Turn the ignition switch OFF.

10. Disconnect the transmission range switch connector.

11. Check for continuity between the No. 1 and No. 10 terminals at the transmission range switch. The shift

position must be R .

Is there continuity?

YES: Check for loose or poor connections at the transmission range switch connector
terminal No. 1. If the connection is OK, repair open in the wire between PCM connector
terminal C12 and the transmission range switch, then go to step 12.

NO: Replace the transmission range switch, then go to step 12.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 158: Checking For Continuity Between The No. 1 & No. 10 Terminals At The
Transmission Range Switch

12. Clear the DTC with the HDS.

13. Start the engine, and shift the shift lever slowly into the P , R , then N position.

14. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0812.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0815: SHORT IN TRANSMISSION GEAR SELECTION SWITCH UPSHIFT SWITCH
CIRCUIT, OR TRANSMISSION GEAR SELECTION SWITCH UPSHIFT SWITCH STUCK ON

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

1. Turn the ignition switch ON (II).

2. Shift to the P position.

3. Verify the transmission gear selection switch upshift switch inputs with the HDS in the A/T data list.

Is UPSHIFT SW ON?

YES: Go to step 4.

NO: Intermittent failure, the system is OK at this time. Check the WHT/BLU 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 upshift switch inputs with the HDS in the A/T data list.

Is UPSHIFT 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. 7 and body

ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal D3 and the
transmission gear selection switch connector, then go to step 12.

NO: Check for loose or poor connections at PCM connector terminal D3. 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