C1253

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1253: Pump Motor Relay
C1253 - Pump Motor Relay

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.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the master cylinder solenoid, perform calibration Programming and Relearning.
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Start the engine.

(f) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

ABS/VSC/TRAC





(g) Check the operating sound of the motor individually when operating it with the Techstream.

OK:

An operating sound of the motor can be heard.

NG -- CHECK TERMINAL VOLTAGE (+BM1, +BM2)
OK -- Continue to next step.

2. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Depress the brake pedal more than 40 times.

(d) Turn the engine switch on (IG).

(e) Wait until the pump motor stops.

(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)

(g) Wait until the pump stops. (Procedure B)

(h) Repeat the above steps (procedure A and B) 3 more times.

(i) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. CHECK TERMINAL VOLTAGE (+BM1, +BM2)

(a) Disconnect the A7 and A8 skid control ECU connectors.

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





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) C0278

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Depress the brake pedal more than 40 times.

(d) Turn the engine switch on (IG).

(e) Wait until the pump motor stops.

(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)

(g) Wait until the pump stops. (Procedure B)

(h) Repeat the above steps (procedure A and B) 3 more times.

(i) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting