P0502 (CVT (TCM))

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 (CVT)

1. 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. Enter the VSA maintenance mode .

   -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)

   -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 (female terminals) No. 3 :
   Test point 2	Body ground

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

   Is there about 5 V?

   YES 

   Go to step 4.

   NO 

   Go to step 3.

3. 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 (female terminals) No. 3 :
   Test point 2	TCM 50P connector No. 41

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

   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)

   -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 (female terminals) No. 2 :
   Test point 2	CVT speed sensor 3P connector (female terminals) No. 3 :

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

   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)

   -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 (female terminals) No. 1 :
   Test point 2	Body ground

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

   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)

   -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 (female terminals) No. 1 :
   Test point 2	TCM 50P connector No. 22

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

   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.