Dtc C1251 Open In Pump Motor Circuit

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK CONNECTION OF PUMP MOTOR WIRE HARNESS

CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS

RECONFIRM DTC

DTC C1251 Open in Pump Motor Circuit


DESCRIPTION

The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU (master cylinder solenoid).

DTC Code
DTC Detection Condition
Trouble Area
C1251
There is an open in the motor system circuit (motor input circuit).
  1. Pump motor wire harness connection
  2. Brake booster with accumulator pump assembly
  3. Skid control ECU (Master cylinder solenoid)

INSPECTION PROCEDURE

NOTICE:
After replacing the master cylinder solenoid, perform zero point calibration (Click here).
HINT:
Remove the hydraulic brake booster assembly before the inspection (for LHD: Click here, for RHD: Click here).
1.CHECK CONNECTION OF PUMP MOTOR WIRE HARNESS

  1. Remove the hydraulic brake booster assembly (for LHD: Click here, for RHD: Click here).

  1. Check the tightening torque of the 2 screws which secure the wire harness connecting the master cylinder solenoid and brake booster with accumulator pump assembly (for LHD: Click here, for RHD: Click here).

OK:
The harness is tightened to the specified torque.


NG
RETIGHTEN SCREWS
OK


2.CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS

  1. Using a screwdriver, remove the 2 screws and pull out the wire harness from the master cylinder solenoid.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1251 Open In Pump Motor Circuit

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Red wire terminal - Black wire terminal
    		Always
    		Below 2 Ω
    Text in Illustration
    *1
    		Pump motor wire harness
    *a
    		Red wire
    *b
    		Black wire
HINT:
Refer to the brake booster with accumulator pump assembly installation procedures:
  1. for LHD (Click here)
  2. for RHD (Click here)


NG
REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY
OK


3.RECONFIRM DTC

  1. Reassemble the hydraulic brake booster assembly (for LHD: Click here, for RHD: Click here).

  1. Install the hydraulic brake booster assembly (for LHD: Click here, for RHD: Click here).

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Check if the same DTC is output (Click here).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output (for LHD)
    		B
    DTC is output (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)