Dtc C1241/94 Low Power Supply Voltage

Drive Line. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Differential. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

INSPECT FUSE (ECU-IG1)

CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY)

CHECK WIRE HARNESS (4WD CONTROL ECU - BODY GROUND)

RECONFIRM DTC

DTC C1241/94 Low Power Supply Voltage


DESCRIPTION

If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU or in a speed sensor occurs, the 4WD control ECU will prohibit operations by the fail-safe function.

DTC No.
DTC Detection Condition
Trouble Area
C1241/94
When one of following conditions is met:
  1. When following continues for 10 seconds or more:
    - At a vehicle speed of 3 km/h (2 mph) or more, voltage of IG1 terminal is 9.5 V or less.
  2. When both of following continue for 60 seconds or more:
    - With the voltage of IG1 terminal 9.5 V or less, communication with the skid control ECU cannot be performed.
    - A Malfunction in communication with skid control ECU.
  3. When following continue for 3 seconds or more:
    - With the voltage of IG1 terminal 17 V or more, communication with the skid control ECU cannot be performed.
  1. Battery
  1. Generator
  1. ECU-IG1
  1. Wire harness (IG1 circuit, GND circuit)
  1. 4WD control ECU

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Differential.Active Torque Control 4Wd System. Dtc C1241/94 Low Power Supply Voltage


INSPECTION PROCEDURE

HINT:
Check the condition of each related circuit connector before troubleshooting (RAV4_ACA30 RM000000UZ306OX.html).
1.CHECK FOR DTC

  1. Clear the DTC (RAV4_ACA30 RM0000020BA00VX.html).

  1. Turn the ignition switch on (IG) and check that no CAN communication system DTC is output.

  1. Start the engine.

  1. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more, and check that no speed sensor DTC (brake control system DTC) is output (RAV4_ACA30 RM000000ONJ02UX.html and RAV4_ACA30 RM000000ONJ02VX.html).

    Result:

    Result
    		Proceed to
    Neither CAN communication system DTC nor speed sensor DTC (Brake control system DTC) is output
    		A
    CAN communication system DTC is output
    		B
    Speed sensor DTC (Brake control system DTC) is output
    		C
    HINT:
    When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.


B
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM)

C
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (BRAKE CONTROL SYSTEM)
A


2.INSPECT FUSE (ECU-IG1)

  1. Remove the ECU-IG1 fuse from the instrument junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1Ω
    HINT:
    Check for short circuits in all harnesses and connector connected to the ECU-IG1 fuse (RAV4_ACA30 RM0000018UO018X.html).


NG
REPLACE FUSE
OK


3.CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Differential.Active Torque Control 4Wd System. Dtc C1241/94 Low Power Supply Voltage

  1. Disconnect the E67 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E67-11 (IG1) - Body ground
    		Ignition switch on (IG)
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK WIRE HARNESS (4WD CONTROL ECU - BODY GROUND)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Differential.Active Torque Control 4Wd System. Dtc C1241/94 Low Power Supply Voltage

  1. Disconnect the E67 ECU connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E67-23 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.RECONFIRM DTC

  1. Clear the DTC (RAV4_ACA30 RM0000020BA00VX.html).

  1. Start the engine.

  1. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more, and check if the same DTC is output.

    Result:
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B
    HINT:
    Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs.


B
END
A

REPLACE 4WD CONTROL ECU