DTC 51-12

DTC 51-12  : Motor Power Source Circuit Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTCs (VSA)

1. 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, then to the ON mode.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   51-12 Motor Power Source Circuit Malfunction

   Is DTC 51-12 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

2. Fuse check

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

   -2. Check the following fuse.

   Fuse	No. D1-4 (40 A)
   Location	Auxiliary under-dash fuse box A

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 5.

   NO 

   Go to step 3.

3. Shorted wire check (+B ABS/VSA MTR line)

   -1. Disconnect the following connector.

   VSA modulator-control unit 21P connector

   -2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 21P connector: disconnected
   Test point 1	VSA modulator-control unit 21P connector No. 4
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the +B ABS/VSA MTR wire between the No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A and the VSA modulator-control unit.

   NO 

   The +B ABS/VSA MTR wire is OK. Install a new No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A, then go to step 4.

4. VSA modulator-control unit check

   -1. Reconnect the following connector.

   VSA modulator-control unit 21P connector

   -2. Turn the vehicle to the ON mode.

   -3. Clear the DTC with the HDS.

   -4. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   51-12 Motor Power Source Circuit Malfunction

   Is DTC 51-12 indicated?

   YES 

   Go to step 5.

   NO 

   The troubleshooting is complete.

5. Open wire check (+B ABS/VSA MTR line)

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

   -2. Disconnect the following connector.

   VSA modulator-control unit 21P connector

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 21P connector: disconnected
   Test point 1	VSA modulator-control unit 21P connector No. 4
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B ABS/VSA MTR wire is OK. Go to step 6.

   NO 

   Repair an open in the +B ABS/VSA MTR wire between the No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A and the VSA modulator-control unit.

6. VSA modulator-control unit check (update)

   -1. Reconnect the following connector.

   VSA modulator-control unit 21P connector (if disconnected)

   -2. Update the VSA modulator-control unit if it does not have the latest software .

   -3. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame

   Is DTC 51-12 indicated?

   YES 

   Check for loose terminals in the VSA modulator-control unit 21P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit .

   NO 

   Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.