Anti-Lock Brake System for Hatchback (from 07/2011)

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ANTI-LOCK BRAKE SYSTEM (for Hatchback): C146C, C146D: Open in ABS Motor Relay Circuit
C146D - Short in ABS Motor Relay Circuit

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the ABS pump motor.

If the voltage supplied to the motor relay (+BM) is below the DTC's detection threshold due to low voltage from the battery or generator, the DTC may be stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
When C1241 is output together with C146C and/or C146D inspect and repair the trouble areas indicated by C1241 first Anti-Lock Brake System for Hatchback (from 07/2011).

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Clear the DTC Anti-Lock Brake System (for Hatchback).

(e) Enter the following menu: Chassis / ABS/VSC/TRAC / Active Test.

ABS/VSC/TRAC





(f) Check the operating sound of the ABS motor relay when operating it with the Techstream.

Result





B -- RECONFIRM DTC
A -- Continue to next step.

2. CHECK TERMINAL VOLTAGE (+BM TERMINAL)

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(c) Check the connector case and terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Disconnect the skid control ECU connector.





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

Standard Voltage:





Text in Illustration





(f) Turn the ignition switch off.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

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





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.

4. RECONFIRM DTC Anti-Lock Brake System for Hatchback (from 07/2011)

B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal (from 07/2011)

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Anti-Lock Brake System for Hatchback (from 07/2011)