DTC Troubleshooting: P0816 (24-6) (A/T)

DTC Troubleshooting: P0816 (24-6)

DTC P0816:

Short in Transmission Gear Selection Switch Downshift Switch Circuit, or Transmission Gear Selection Switch Downshift Switch Stuck ON

NOTE:

Record all freeze data and review General Troubleshooting Information before you troubleshoot.
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

1.	Turn the ignition switch ON (II).

2.	Shift the shift lever into the [P] position.

3.	Verify the transmission gear selection switch downshift switch inputs with the Honda PGM Tester or HDS in the A/T data list. Is DOWNSHIFT SW ON? YES - Go to 4. NO - Intermittent failure, the system is OK at this time.n

4.	Turn the ignition switch OFF.

5.	Disconnect the transmission gear selection switch connector.

6.	Turn the ignition switch ON (II).

Verify the transmission gear selection switch downshift switch inputs with the Honda PGM Tester or HDS in the A/T data list.

Is DOWNSHIFT SW ON?

YES - Go to 8.

NO - Faulty the transmission gear selection switch downshift switch. Replace the shift lever bracket base. The transmission gear selection switch is not available separately from the shift lever bracket base. After replacing the switch, go to 13, and check that the repair has been completed.

8.	Check for continuity between the No. 8 terminal of the transmission gear selection switch connector 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.n NO - Go to 9.

9.	Turn the ignition switch OFF.

10.	Jump the SCS line with the Honda PGM Tester or HDS.

11.	Disconnect PCM connector D (17P).

12.

Check for continuity between the No. 8 terminal of the transmission gear selection switch connector 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.n

NO - Check for loose or poor connections at PCM connector terminal D9. If the connections are OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.n

13.	Clear the DTC in CLEAR MENU with the Honda PGM Tester or HDS.

14.	Test-drive the vehicle for several minutes under the same conditions as those indicated by the freeze data.

15.	Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0816. Did the result pass? YES - The problem has been corrected.n NO - Return to step 1 and recheck.n