Vehicle Stability Control System

VEHICLE STABILITY CONTROL SYSTEM: C1241/41: Low Battery Positive Voltage

DTC C1241/41 - Low Battery Positive Voltage

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the 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 alternator circuit, etc.
The DTC is cancelled when the IG1 terminal voltage returns to normal.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the brake actuator assembly, perform zero point calibration (Programming and Relearning).

PROCEDURE

1. INSPECT ECU-IG FUSE





(a) Remove the ECU-IG fuse from the main body ECU (driver side junction block).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE ECU-IG FUSE
OK -- Continue to next step.
2. CHECK BATTERY
(a) Install the ECU-IG fuse.
(b) Check the battery voltage.
Standard voltage:
11 to 14 V
NG -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU (IG1 TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (GND TERMINAL)





(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Reconnect the skid control ECU connector.
(b) Clear the DTC (Vehicle Stability Control System).
(c) Turn the ignition switch to the ON position.
(d) Check if the same DTC is recorded (Vehicle Stability Control 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 BRAKE ACTUATOR ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)