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

?4.
Start the engine.

?5.
Disable the VSA by pressing the VSA OFF button.

NOTE: Enter the VSA maintenance mode in case of the vehicle speed above 31 mph (50 km/h).

?6.
Test-drive the vehicle in D position/mode, and the engine speed at 1,000 rpm or higher, then release the accelerator without pressing it again, for at least 4 seconds. Slow down and stop the wheels.

?7.
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. 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 (VCC2 line, others):

Determine possible failure area (VCC2 line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following 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 circuit
VCC2
Test point 1
CVT speed sensor 3P connector No. 3 (TAN)
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
The VCC2 wire is OK. Go to step 4.
     
NO
     
     
     
Go to step 3.
3.
Open wire check (VCC2 line):

Open wire check (VCC2 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?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 circuit
VCC2
Test point 1
CVT speed sensor 3P connector No. 3 (TAN)
Test point 2
PCM connector C (51P) No. 30 (TAN)


Is there continuity?

     
YES
     
     
     
The VCC2 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 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 circuit
VCC2, SG2
Test point 1
CVT speed sensor 3P connector No. 2 (GRY)
Test point 2
CVT speed sensor 3P connector No. 3 (TAN)


Is there about 5 V?

     
YES
     
     
     
The SG2 wire is OK. Go to step 5.
     
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.

?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 circuit
VEL DD
Test point 1
CVT speed sensor 3P connector No. 1 (WHT)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to body 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 circuit
VEL DD
Test point 1
CVT speed sensor 3P connector No. 1 (WHT)
Test point 2
PCM connector C (51P) No. 32 (WHT)


Is there continuity?

     
YES
     
     
     
The VEL DD wire is OK.Replace the CVT speed sensor.?
     
NO
     
     
     
Repair an open in the VEL DD wire between the CVT speed sensor and the PCM.?