DTC    C1241/41    Low Battery Positive Voltage or Abnormally High Battery Positive Voltage

for Preparation Click here


DESCRIPTION

If a malfunction is detected in the power supply circuit of the brake actuator assembly (skid control ECU), the skid control ECU (housed in the actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation (Click here).
This DTC is output when the IG1 terminal voltage deviates from the normal condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.
This DTC is cancelled when the IG1 terminal voltage returns to normal (only when the voltage returns to normal from a voltage lower than the specified value).

DTC No.
DTC Detecting Condition
Trouble Area
C1241/41
With vehicle speed more than 6 km/h (4 mph), when any of the following is detected:
  1. Battery voltage is 16.9 V or more.
  2. Battery voltage is 9.4 V or less when ABS does not operate.
  3. Battery voltage is 9.2 V or less when ABS operates.
  1. Battery
  2. Charging system
  3. Power source circuit
  4. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM


C141355E01


INSPECTION PROCEDURE

HINT:
Check the condition of each related circuit connector before troubleshooting (Click here).
1.INSPECT FUSE (ECU-IG NO. 2 FUSE)


    C136048E01

  1. Remove the ECU-IG No. 2 fuse from the instrument panel J/B.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    ECU-IG No. 2 fuse
    		Below 1 Ω (Continuity)

  1. Install the fuse.



NG
REPLACE FUSE
OK


2.INSPECT BATTERY

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V


NG
INSPECT CHARGING SYSTEM
OK


3.INSPECT SKID CONTROL ECU CONNECTOR (IG1 TERMINAL VOLTAGE)


    C131970E07

  1. Disconnect the skid control ECU connector.

  1. Turn the ignition switch to the ON position.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A25-18 (IG1) -
    Body ground
    		Ignition switch on
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK


4.INSPECT SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY)


    C131970E05

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    A25-4 (GND1) - Body ground
    		Below 1 Ω
    A25-1 (GND2) - Body ground
    		Below 1 Ω

  1. Connect the connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK


5.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the ignition switch to the ON position.

  1. Check if the same DTC is recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

    Result:

    Condition
    		Proceed to
    DTC (C1241/41) is output
    		A
    DTC (C1241/41) is output (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE)
    		B
    DTC (C1241/41) is not output (When troubleshooting in accordance with the DTC CHART)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

C
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)