DTC Troubleshooting: P0502
DTC P0502: CVT Speed Sensor Circuit Open/Short
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
P0502 CVT Speed Sensor Circuit Open/Short
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

?5.
Enter the VSA maintenance mode (with VSA).

?6.
Test-drive the vehicle at a speed of 37 mph (60 km/h) or more.

?7.
Release the accelerator pedal, then slow down, and stop the wheels.

?8.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0502 CVT Speed Sensor Circuit Open/Short
      

Is DTC P0502 indicated?

     
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 speed 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 (VEL DD line, others):

Determine possible failure area (VEL DD line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
CVT speed sensor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CVT speed sensor 3P connector: disconnected
Test point 1
CVT speed sensor 3P connector No. 3
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 5.
3.
Open wire check (VCC2 line):

Open wire check (VCC2 line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CVT speed sensor 3P connector: disconnected
Test point 1
CVT speed sensor 3P connector No. 1
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
The VCC2 wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the VCC2 wire between the CVT speed sensor and the PCM.?
4.
Open wire check (SG2 line):

Open wire check (SG2 line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CVT speed sensor 3P connector: disconnected
Test point 1
CVT speed sensor 3P connector No. 1
Test point 2
CVT speed sensor 3P connector No. 2


Is there about 5 V?

     
YES
     
     
     
The SG2 wire is OK. Go to step 7.
     
NO
     
     
     
Repair an open in the SG2 wire between the CVT speed sensor and the PCM.?
5.
Shorted wire check (VEL DD line):

Shorted wire check (VEL DD line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector C (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
PCM connector C (51P): disconnected
Test point 1
CVT speed sensor 3P connector No. 3
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the VEL DD wire between the CVT speed sensor and the PCM.?
     
NO
     
     
     
The VEL DD wire is not shorted. Go to step 6.
6.
Open wire check (VEL DD line):

Open wire check (VEL DD line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
PCM connector C (51P): disconnected
Test point 1
CVT speed sensor 3P connector No. 3
Test point 2
PCM connector C (51P) No. 32


Is there continuity?

     
YES
     
     
     
The VEL DD wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0502 goes away and the PCM was updated, troubleshooting is complete. If DTC P0502 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the VEL DD wire between the CVT speed sensor and the PCM.?
7.
CVT speed sensor check:

CVT speed sensor check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Connect all connectors.

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Turn the vehicle to the OFF (LOCK) mode.

?6.
Enter the VSA maintenance mode (with VSA).

?7.
Test-drive the vehicle at a speed of 37 mph (60 km/h) or more, then slow down, and stop the wheels.

?8.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0502 CVT Speed Sensor Circuit Open/Short
      

Is DTC P0502 indicated?

     
YES
     
     
     
     
NO
     
     
     
The CVT speed sensor is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0502 goes away and the PCM was updated, troubleshooting is complete. If DTC P0502 goes away and the PCM was substituted, replace the original PCM.?