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

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ANTI-LOCK BRAKE SYSTEM (for Hatchback): C1241: Low Power Supply Voltage Malfunction
C1241 - Low Power Supply Voltage Malfunction

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the IG1 terminal voltage deviates from the DTC detection condition due to a malfunction in the power supply or charging circuit such as the battery or generator circuit, etc.

The DTC is cancelled when the IG1 terminal voltage returns to normal.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

NG -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Testing and Inspection
OK -- Continue to next step.

2. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

(a) Disconnect the skid control ECU (brake actuator assembly) connector.

(b) Turn the ignition switch to ON.

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





Standard Voltage:





Text in Illustration





(d) Turn the ignition switch off.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

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





Standard Resistance:





Text in Illustration





(b) Reconnect the skid control ECU (brake actuator assembly) connector.

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

4. RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

(d) Check if the same DTC is recorded Anti-Lock Brake System (for Hatchback).

Result





HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table (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)