DTC Troubleshooting: P0843
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 Description
Confirmed DTC
Pending DTC
Freeze Frame
P0843 Transmission Fluid Pressure Sensor/Switch "A" Circuit High
      

1.
Problem verification:

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):

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 No. 1
Terminal B
CVT driven pulley pressure sensor 3P connector No. 2


?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):

Open wire check (PDN line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the jumper wire.

?3.
Disconnect the following connector.
TCM 50P connector

?4.
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 No. 2
Test point 2
TCM 50P connector No. 31


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 substitute a known-good TCM, then recheck. If this DTC goes away and the TCM was substituted, 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:

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 No. 1
Test point 2
CVT driven pulley pressure sensor 3P connector No. 3


Is there about 5 V?

     
YES
     
     
     
     
NO
     
     
     
The CVT driven pulley pressure sensor is OK. Go to step 5.
5.
Open wire check (VCC4 line):

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 No. 3
Test point 2
Body ground


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.?