DTC Troubleshooting: P0843(CVT (TCM))

DTC P0843  : Transmission Fluid Pressure Sensor/Switch A Circuit High

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC(CVT)

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
   Driven Pulley Pressure Sensor(V)	More than 4.84	V

   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 the CVT driven pulley pressure sensor and the TCM. 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/onboard snapshot.

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

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

   -2. Disconnect the following connector.

   CVT driven pulley pressure sensor 3P connector

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

   Terminal A	CVT driven pulley pressure sensor 3P connector (female terminals) No. 1 :
   Terminal B	CVT driven pulley pressure sensor 3P connector (female terminals) 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
   Driven Pulley Pressure Sensor(V)	More than 4.84	V

   Do the current condition(s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Open wire check (PDN 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 more than 1 minute.

   NOTE:  This step must be done to protect the TCM from damage.

   -4. Disconnect the following connector.

   TCM 50P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CVT driven pulley pressure sensor 3P connector: disconnected
   	TCM 50P connector: disconnected
   Test point 1	CVT driven pulley pressure sensor 3P connector (female terminals) No. 2 :
   Test point 2	TCM 50P connector No. 31

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

   Is there continuity?

   YES 

   The PDN wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the original TCM .

   NO 

   Repair an open in the PDN wire between the CVT driven pulley pressure sensor and the TCM.

4. CVT driven pulley 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
   	CVT driven pulley pressure sensor 3P connector: disconnected
   Test point 1	CVT driven pulley pressure sensor 3P connector (female terminals) No. 1 :
   Test point 2	CVT driven pulley pressure sensor 3P connector (female terminals) No. 3 :

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

   Is there about 5 V?

   YES 

   Replace the CVT driven pulley pressure sensor .

   NO 

   The CVT driven pulley pressure sensor is OK. Go to step 5.

5. Open wire check (VCC4 line)

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

   Test condition	Vehicle ON mode
   	CVT driven pulley pressure sensor 3P connector: disconnected

   Test point 1	CVT driven pulley pressure sensor 3P connector (female terminals) 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 SG4 wire between the CVT driven pulley pressure sensor and the TCM.

   NO 

   Repair an open in the VCC4 wire between the CVT driven pulley pressure sensor and the TCM.