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

DTC Code DTC Name
C1241/41 Low Battery Positive Voltage

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU 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.

DTC Code DTC Detection Condition Trouble Area
C1241/41

When any of the following is detected:


  1. At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is 19 V or less for 10 seconds or more.

  2. IG1 terminal voltage is 34 V or more for 1.2 seconds or more.

  3. When IG1 terminal voltage is 19 V or less, the detection condition for an open in the solenoid relay or motor relay is met.

  4. When AST terminal voltage is 19 V or less, the detection condition for a solenoid malfunction is met for 0.5 seconds or more.

  • ECU-IG fuse

  • Battery

  • Charging system

  • Power source circuit

  • Internal power supply circuit of the skid control ECU

WIRING DIAGRAM

A01CHLOE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT ECU-IG FUSE


    1. A01CJ21E01

      Remove the ECU-IG fuse from the No. 1 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      ECU-IG (15 A) fuse Always Below 1 Ω

    NG

    REPLACE ECU-IG FUSE

    OK

  2. CHECK BATTERY


    1. Install the ECU-IG fuse.

    2. Check the battery voltage.

      Standard voltage
      20 to 32 V
      Result
      Result Proceed to
      OK A
      NG (N04C-TQ) B
      NG (N04C-TW) C

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  3. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A01CIMFE01

      Disconnect the skid control ECU connector.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S13-7 (IG1) - Body ground Ignition switch ON 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A01CJEKE01

      Turn the ignition switch off.

    2. Disconnect the skid control ECU connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-2 (GND1) - Body ground Always Below 1 Ω
      S14-3 (GND2) - Body ground Always Below 1 Ω
      S11-15 (GND3) - Body ground Always Below 1 Ω
      S11-14 (GND4) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Reconnect the skid control ECU connectors.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. Drive the vehicle at the speed of 3 km/h (2 mph) or more for 10 seconds or more.

    4. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Result
      Result Proceed to
      DTC (C1241/41) is not output A
      DTC (C1241/41) is output B

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here