Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Low or High Power Supply Voltage (C1241)

Toyota Corolla Cross (2022-2026) Service Manual / Drivetrain / Gf1a (transfer / 4wd / Awd) / Dynamic Torque Control Awd System / Low or High Power Supply Voltage (C1241)

DESCRIPTION

If a malfunction in the power source circuit occurs, or a malfunction in communication between the skid control ECU (brake actuator assembly) and 4WD ECU assembly occurs, the 4WD ECU assembly will detect a decreased supply voltage malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1241

Low or High Power Supply Voltage
  • At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is 9.5 V or less for 10 seconds or more.
  • At an engine speed of 300 rpm or more, the IG1 terminal voltage is 9.5 V or less for 10 seconds or more.
  • When the IG1 terminal voltage is 9.5 V or less, speed sensor decreased supply voltage continues for 60 seconds or more, or data cannot be received from the skid control ECU (brake actuator assembly)
  • When the IG1 terminal voltage is 17 V or more, data cannot be received from the skid control ECU (brake actuator assembly) for 3 seconds or more.
  • Auxiliary battery
  • Charging system
  • Wire harness or connector
  • Electronically controlled brake system
  • CAN communication system
  • 4WD ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check if CAN communication system DTCs are output.

Click here

(b) Start the engine.

(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the speed sensor DTC (electronically controlled brake system DTC) is output.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

Neither CAN communication system DTC nor speed sensor DTC (electronically controlled brake system DTC) is output

A

CAN communication system DTC is output

B

Speed sensor DTC (electronically controlled brake system DTC) is output

C
B

GO TO CAN COMMUNICATION SYSTEM

C

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

2.

INSPECT AUXILIARY BATTERY

(a) Check the auxiliary battery voltage.

Standard voltage:

11 to 14 V

NG

CHECK CHARGING SYSTEM

OK

3.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

(a) Disconnect the 4WD ECU assembly connector.

*a

Front view of wire harness connector

(to 4WD ECU Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O201-3 (IG1) - Body ground

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O201-4 (GND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

RECONFIRM DTC

(a) Clear the DTC.

Chassis > Four Wheel Drive > Clear DTCs

(b) Start the engine.

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

Chassis > Four Wheel Drive > Trouble Codes

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.

A

REPLACE 4WD ECU ASSEMBLY

B

CHECK FOR INTERMITTENT PROBLEMS

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