Acura TSX / Honda Accord CL. Manual — part 968

Fig. 159: Checking For Continuity Between Transmission Gear Selection Switch Connector
Terminal No. 7 & 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 P0815.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0816: SHORT IN TRANSMISSION GEAR SELECTION SWITCH DOWNSHIFT SWITCH
CIRCUIT, OR TRANSMISSION GEAR SELECTION SWITCH DOWNSHIFT SWITCH STUCK ON

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 downshift switch inputs with the HDS in the A/T data list.

Is DOWNSHIFT SW ON?

YES: Go to step 4.

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

Is DOWNSHIFT 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. 8 and body

ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal D9 and the
transmission gear selection switch connector, then go to step 12.

NO: Check for loose or poor connections at PCM connector terminal D9. 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.

NOTE:

z

Record all freeze data and review General Troubleshooting Information
(see GENERAL TROUBLESHOOTING INFORMATIONGENERAL
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. 160: Checking For Continuity Between Transmission Gear Selection Switch Connector
Terminal No. 8 & 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 P0816.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0842: SHORT IN 2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH CIRCUIT, OR
2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH STUCK ON

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

1. Clear the DTC with the HDS.

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

Is the 2nd PRES SWITCH OFF?

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 2nd gear in the D 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 P0842.

Did the result indicate a fail?

YES: Go to step 5.

NO: Intermittent failure, the system is OK at this time. Check the BLU/RED wire for an
intermittent short to ground between the 2nd 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 2nd clutch transmission fluid pressure switch connector.

7. Turn the ignition switch ON (II).

8. Check the 2nd PRES SWITCH signal with the HDS in the A/T data list.

Is the 2nd PRES SWITCH OFF?

YES: Replace the 2nd clutch transmission fluid pressure switch (see 2ND CLUTCH
TRANSMISSION FLUID PRESSURE SWITCH REPLACEMENT ), then 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 C13 and body ground.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal C13 and the 2nd
clutch transmission fluid pressure switch, then 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