Open in Pump Motor Circuit - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1251/51: Open in Pump Motor Circuit

DTC C1251/51 - Open in Pump Motor Circuit

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information Vehicle Stability Control System.
HINT:
When C0273/13, C0274/14 and/or C1361/91 is output together with C1251/51, inspect and repair the trouble areas indicated by C0273/13, C0274/14 and/or C1361/91 first C0273.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Select the Active Test mode on the Techstream Data List / Active Test.

ABS / VSC / TRAC





(d) Check for the operating sound of the ABS motor relay when operating it using the Techstream.
Result:






B -- RECONFIRM DTC
A -- Continue to next step.
2. INSPECT BRAKE ACTUATOR ASSEMBLY (GND2 TERMINAL)





(a) Turn the engine switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(c) Disconnect the brake actuator connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Reconnect the brake actuator connector.
(b) Clear the DTCs Vehicle Stability Control System.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.
(e) Check if the same DTC is recorded Vehicle Stability Control System.
Result:





HINT:
- If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
- If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU and/or brake actuator assembly. Make sure that no DTCs are output.
- If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and/or brake actuator assembly, inspect and repair the connector or wire harness.
- It is suspected that the DTCs were output due to a bad connection of the connector terminal.

B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)