Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1241/41: Low Battery Positive Voltage

DTC C1241/41 - Low Battery Positive Voltage

DTC C1242/42 - Open in IG1 / IG2 Power Source Circuit

DESCRIPTION

These codes are memorized when the power source voltage for the skid control ECU drops or the voltage for the ABS MAIN1 relay and ABS MAIN2 relay operation drops.
HINT: DTC C1256/57 (accumulator low pressure) may be memorized if the power source voltage drops.





WIRING DIAGRAM









INSPECTION PROCEDURE
NOTE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Programming and Relearning.

PROCEDURE

1. INSPECT BATTERY
(a) Check the battery voltage.
Voltage:
11 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.

2. CHECK DTC
(a) Clear the DTCs Electronically Controlled Brake System.
(b) Turn the engine switch off.
(c) Turn the engine switch on (IG).
(d) Check that the DTCs (Electronically Controlled Brake System and SFI system) are recorded.
Result:






C -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
B -- REPAIR ENGINE CONTROL SYSTEM ACCORDING TO DTC OUTPUT
A -- Continue to next step.

3. INSPECT SKID CONTROL ECU (IG AND DI TERMINALS)




(a) Disconnect the skid control ECU (A13, A15) connectors.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:






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

4. INSPECT SKID CONTROL ECU (GND TERMINAL)




(a) Disconnect the skid control ECU (A13, A15) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






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

5. RECONFIRM DTC
(a) Clear the DTC Electronically Controlled Brake System.
(b) Turn the engine switch on (IG).
(c) Check if the same DTCs are recorded Electronically Controlled Brake System.
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.

B -- REPLACE SKID CONTROL ECU
A -- END