ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1241/41

DTC Code DTC Name
C1241/41 Low Battery Positive Voltage

DESCRIPTION

If there is a problem with the brake actuator assembly (skid control ECU) power supply circuit, the skid control ECU outputs the DTC and prohibits the ABS operation with the fail safe function.

If the voltage supplied to the IG1 terminal is not within the DTC detection threshold due to malfunctions in such as the battery and alternator circuit, this DTC is stored.

DTC No. DTC Detection Condition Trouble Area
C1241/41

When any of the following is detected:


  • Vehicle speed is 1.8 mph (3 km/h) or more and IG1 terminal voltage is 9.5 V or less for at least 10 seconds.


  • While the solenoid relay is ON, the IG1 terminal voltage is 9.5 V or less and the relay contact is open for at least 0.2 seconds.


  • While the motor relay is ON, the IG1 terminal voltage is 9.5 V or less and the relay contact is open for at least 0.2 seconds.

  • Battery


  • ECU-IG NO. 1 fuse


  • Charging system


  • Power source circuit

WIRING DIAGRAM

A003BKUE01

INSPECTION PROCEDURE

Tech Tips

After steps 1 and 2 are completed, start the inspection from step 3 when using the intelligent tester, and from step 4 when not using the intelligent tester.

PROCEDURE


  1. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V

    NG

    INSPECT CHARGING SYSTEM

    OK

  2. INSPECT FUSE (ECU-IG NO. 1 FUSE)


    1. A003CECE02

      Remove the ECU-IG NO. 1 fuse from the instrument panel junction block.

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

      Standard resistance
      Tester Connection Specified Condition
      ECU-IG NO. 1 (7.5 A) fuse Below 1 Ω (Continuity)

    NG

    REPLACE FUSE (ECU-IG NO.1 FUSE)

    OK

  3. READ VALUE USING INTELLIGENT TESTER (IG1 POWER SUPPLY)


    1. Install the ECU-IG NO. 1 fuse.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

    4. Start the engine.

    5. Select the DATA LIST mode on the intelligent tester.

      ABS:
      Item (Display) Measurement Item / Range (Display) Normal Condition Diagnostic Note
      ECU IG Power Voltage ECU IG power supply voltage / TOO LOW/NORMAL

      TOO LOW: 9.5 V or less

      NORMAL: 9.5 to 14.0 V

      		 -

    6. Measure the voltage output from the ECU displayed on the intelligent tester.

      OK
      "Normal" is displayed.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)


    1. A003DPCE14

      Disconnect the skid control ECU connector.

    2. Turn the ignition switch to ON position.

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

      Standard voltage
      Tester Connection Specified Condition
      B19-25 (IG1) - Body ground 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)


    1. A003DPCE11

      Turn the ignition switch off.

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

      Standard resistance
      Tester Connection Specified Condition
      B19-2 (GND1) - Body ground Below 1 Ω
      B19-24 (GND2) - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  6. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check that the same DTC is recorded Click here.

      Tech Tips

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

    B

    END

    C

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY