Dtc C1251 Open In Pump Motor Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS

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 CodeDTC Detection ConditionTrouble Area
C1251There is an open in the motor system circuit (motor input circuit).
Pump motor wire harness connection
Brake booster with accumulator pump assembly
Skid control ECU (Master cylinder solenoid)

INSPECTION PROCEDURE

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

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

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: , for RHD: ).

  • OK:
  • The harness is tightened to the specified torque.
NG
RETIGHTEN SCREWS
OK
2.CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS

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

Dtc C1251 Open In Pump Motor Circuit. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    Red wire terminal - Black wire terminalAlwaysBelow 2 Ω
Text in Illustration
*1Pump motor wire harness
*aRed wire
*bBlack wire
  • HINT:
Refer to the brake booster with accumulator pump assembly installation procedures:
for LHD ()
for RHD ()
NG
REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY
OK
3.RECONFIRM DTC

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

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

Clear the DTCs ().

Turn the ignition switch off.

Check if the same DTC is output ().

Result
ResultProceed to
DTC is not outputA
DTC is output (for LHD)B
DTC is output (for RHD)C
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
A
CHECK FOR INTERMITTENT PROBLEMS ()