DTC P2531-00

DTC P2531-00  : Electric Servo Brake Control Unit Power Source Circuit (IG1) Low Voltage

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

DTC (Electric servo brake)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTCs with the HDS.

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

   -4. Wait for 5 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   P2531-00 Electric Servo Brake Control Unit Power Source Circuit (IG1) Low Voltage

   Is DTC P2531-00 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 . 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. Fuse check

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -3. Check the following fuse.

   Fuse

   No. D4

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 3.

   NO 

   Replace the fuse. Turn the vehicle to the ON mode, then to the OFF (LOCK) mode. If the fuse blows again, repair the short to ground on the No. D4 fuse circuit.

3. Open wire check (IG1_HAC line)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -3. Disconnect the following connector.

   Electric servo brake control unit 22P connector

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Electric servo brake control unit 22P connector: disconnected
   Test point 1	Electric servo brake control unit 22P connector No. 17
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The IG1_HAC wire is OK. Check for loose terminals and poor connections in the electric servo brake control unit 22P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric servo brake control unit/pedal feel simulator .

   NO 

   Repair an open in the IG1_HAC wire between the No. D4 fuse and the electric servo brake control unit.