DTC P0502: CVT Speed Sensor Circuit Open/Short

NOTE:

Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the Fuel and Emissions Systems How to Troubleshoot the CVT System(CVT System) .
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:

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 the front wheels to rotate freely.

4. Start the engine.

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

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.

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):

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

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

Is there about 5 V?

YES

The VCC2 wire is OK. Go to step 4.

Go to step 3.

3. Open wire check (VCC2 line):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Jump the SCS line with the HDS, and wait more than 1 minute.

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	PCM connector C (51P) No. 30

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

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 .

Repair an open in the VCC2 wire between the CVT speed sensor and the PCM.

4. 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. 2
Test point 2	CVT speed sensor 3P connector No. 3

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

Is there about 5 V?

YES

The SG2 wire is OK. Go to step 5.

Repair an open in the SG2 wire between the CVT speed sensor and the PCM.

5. Shorted wire check (VEL DD line):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Jump the SCS line with the HDS, and wait more than 1 minute.

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. 1
Test point 2	Body ground

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

Is there continuity?

YES

Repair a short to body ground in the VEL DD wire between the CVT speed sensor and the PCM.

The VEL DD wire is not shorted. Go to step 6.

6. 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. 1
Test point 2	PCM connector C (51P) No. 32

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

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 .

Repair an open in the VEL DD wire between the CVT speed sensor and the PCM.