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, 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).

?5.
Run the vehicle with the shift lever in D position/mode, and the engine speed at 1,000 rpm or higher, then release the accelerator pedal without pressing it again, for at least 4 seconds. Slow down and stop the wheels.

?6.
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 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/on-board snapshot.?
2.
Determine possible failure area (VCC3 line, others):

Determine possible failure area (VCC3 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. 1
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 3.
3.
Open wire check (VCC3 line):

Open wire check (VCC3 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
TCM 50P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
TCM 50P connector: disconnected
Test point 1
CVT speed sensor 3P connector No. 1
Test point 2
TCM 50P connector No. 41


Is there continuity?

     
YES
     
     
     
The VCC3 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 VCC3 wire between the CVT speed sensor and the TCM.?
4.
Open wire check (SG3 line):

Open wire check (SG3 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 SG3 wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the SG3 wire between the CVT speed sensor and the TCM.?
5.
Shorted wire check (VEL-PWM line):

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

?2.
Disconnect the following connector.
TCM 50P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
TCM 50P connector: 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-PWM wire between the CVT speed sensor and the TCM.?
     
NO
     
     
     
The VEL-PWM wire is not shorted. Go to step 6.
6.
Open wire check (VEL-PWM line):

Open wire check (VEL-PWM line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
TCM 50P connector: disconnected
Test point 1
CVT speed sensor 3P connector No. 3
Test point 2
TCM 50P connector No. 22


Is there continuity?

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