DTC P0812 (6-Speed A/T)

DTC P0812  : Transmission Range Switch ATP R Switch

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information - How to Troubleshoot the A/T System .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC (A/T)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Check the parameter (s) below with the HDS with the shift lever in R.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   A/T R Switch	ON

   Do the current condition (s) match the threshold?

   YES 

   Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   The failure is duplicated. Go to step 2.

2. Determine possible failure area (transmission range switch, ATP-R/ATPR line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Transmission range switch 10P connector

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Transmission range switch 10P connector No. 8
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

   - 4. Turn the vehicle to the ON mode.

   - 5. Check the parameter (s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   A/T R Switch	ON

   Do the current condition (s) match the threshold?

   YES 

   Replace the transmission range switch .

   NO 

   Go to step 3.

3. Open wire check (ATP-R/ATPR line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector A (51P)

   - 4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Transmission range switch 10P connector: disconnected
   	PCM connector A (51P): disconnected
   	Transmission range switch 10P connector No. 8: jumped to body ground
   Test point 1	PCM connector A (51P) No. 16 - Refer to: PCM Connector for Inputs and Outputs (16-20 6-Speed A/T)
   Test point 2	Body ground

   Is there continuity?

   YES 

   The ATP-R/ATPR wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (6-Speed A/T, 16-18 9-Speed A/T) .

   NO 

   Repair an open in the ATP-R/ATPR wire between the transmission range switch and the PCM.