DTC P0843: Transmission Fluid Pressure Sensor Circuit High Input (2017)

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2017) .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC (Gear)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

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

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Transmission Fluid Pressure Sensor	4.65 V or higher

   Do the current condition (s) match the threshold?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between transmission fluid pressure sensor and the PCM. 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.

2. Determine possible failure area (PODCL line, others)

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

   - 2. Disconnect the following connector.

   Transmission fluid pressure sensor 3P connector

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

   Terminal A	Transmission fluid pressure sensor 3P connector No. 1
   Terminal B	Transmission fluid pressure sensor 3P connector No. 2

   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
   Transmission Fluid Pressure Sensor	4.65 V or higher

   Do the current condition (s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Open wire check (PODCL line)

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

   - 2. Remove the jumper wire.

   - 3. Jump the SCS line with the HDS, and wait for at least 1 minute.

   - 4. Disconnect the following connector.

   PCM connector E (80P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Transmission fluid pressure sensor 3P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	PCM connector E (80P) No. 33 - Refer to: PCM Connector for Inputs and Outputs (2017)
   Test point 2	Transmission fluid pressure sensor 3P connector No. 2

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

   Is there continuity?

   YES 

   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 (2017) .

   NO 

   Repair an open in the PODCL wire between transmission fluid pressure sensor and the PCM.

4. Transmission fluid pressure sensor check

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

   - 2. Remove the jumper wire.

   - 3. Turn the vehicle to the ON mode.

   - 4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Transmission fluid pressure sensor 3P connector: disconnected
   Test point 1	Transmission fluid pressure sensor 3P connector No. 3
   Test point 2	Transmission fluid pressure sensor 3P connector No. 1

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

   Is there about 5 V?

   YES 

   Replace the transmission fluid pressure sensor .

   NO 

   Transmission fluid pressure sensor is OK, go to step 5.

5. Open wire check (VCC2 line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Transmission fluid pressure sensor 3P connector: disconnected
   Test point 1	Transmission fluid pressure sensor 3P connector No. 3
   Test point 2	Body ground

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

   Is there about 5 V?

   YES 

   Repair an open in the SG2 wire between transmission fluid pressure sensor and the PCM.

   NO 

   Repair an open in the VCC2 wire between transmission fluid pressure sensor and the PCM.