Dtc C1241/41 Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK BATTERY

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

INSPECT SKID CONTROL ECU (GND1 TERMINAL)

RECONFIRM DTC

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


DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the brake 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 standard due to a malfunction in the power supply or charging circuit such as the battery or generator circuit, etc.
The DTC is canceled when the IG1 terminal voltage returns to normal.

DTC Code
DTC Detection Condition
Trouble Area
C1241/41
When one of the following conditions is met:
  1. At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9.5 V for 10 seconds or more.
  2. The solenoid relay remains ON, the IG1 terminal voltage is less than 9.5 V, and the relay contact is open for 0.2 seconds or more.
  3. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply voltage decreases and stays at or below a certain value for 60 seconds or more.
  4. While the motor fail-safe relay is ON after the motor relay turns ON, the IG1 terminal voltage is 9.5 V or less and the actuator pump drive motor is OFF for 0.2 seconds or more.
  5. The IG1 terminal voltage is more than 17.4 V for 0.8 seconds or more.
  1. ECU-IG&GAUGE fuse
  2. Battery
  3. Charging system
  4. IG power source circuit
  5. Internal power supply circuit of skid control ECU

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1241/41 Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (Toyota Fortuner RM000000XHR02TX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK BATTERY

  1. Check the battery voltage.

    Standard Voltage:
    11 to 14 V


NG
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY
OK


2.INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1241/41 Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage

  1. Disconnect the skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    S25-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V


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


3.INSPECT SKID CONTROL ECU (GND1 TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1241/41 Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S25-1 (GND1) - Body ground
    		Always
    		Below 1 Ω


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


4.RECONFIRM DTC

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV03YX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

  1. Check if the same DTC is recorded (Toyota Fortuner RM000000XHV03YX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		B
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (Toyota Fortuner RM000000XHN03SX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

CHECK FOR INTERMITTENT PROBLEMS