VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1241

DTC Code	DTC Name
C1241	Low Power Supply Voltage Malfunction

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the +BS terminal voltage deviates from the DTC detection condition 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 +BS terminal voltage returns to normal.


DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1241	Low Power Supply Voltage Malfunction	Either of the following is detected: When vehicle speed is 3 km/h (2 mph) or more, +BS terminal voltage is continuously below 9.5 V for 10 seconds or more. When solenoid relay is on, +BS terminal voltage is below 9.5 V and relay contact is off for 0.22 seconds or more. When +BS terminal voltage is below 9.5 V, power supply voltage of vehicle speed sensor is continuously low for 60 seconds or more. When fail-safe motor relay is on and +BS terminal voltage is below 9.5 V, fail-safe motor relay overcurrent continues for 0.05 seconds or more.	ABS NO. 2 fuse Battery Charging system Wire harness or connector Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

C283800E10

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.
Click here
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

INSPECT BATTERY

Check the battery voltage.

Standard voltage

11 to 14 V

Result


Proceed to
OK
NG (for 2AD-FHV)
NG (for 2AD-FTV)
NG (for 2AR-FE)
NG (for 3ZR-FAE)
NG (for 3ZR-FE)
NG (for 2WW)

NG (for 2AD-FHV)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

NG (for 2AD-FTV)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

NG (for 2AR-FE)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

NG (for 3ZR-FAE)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

NG (for 3ZR-FE)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

NG (for 2WW)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

OK

CHECK TERMINAL VOLTAGE (+BS TERMINAL)

Turn the ignition switch off.
Make sure that there is no looseness in the locking part and connecting part of the connectors.

C342353C25

Disconnect the A80 skid control ECU (brake actuator assembly) connector.

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

Standard Voltage


Tester Connection	Condition	Specified Condition
A80-38 (+BS) - Body ground	Always	11 to 14 V

Result


Proceed to
OK
NG (w/o Stop and Start System)
NG (w/ Stop and Start System)

NG (w/o Stop and Start System)

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

NG (w/ Stop and Start System)

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)

OK

CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

Turn the ignition switch off.

C342353C26

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

Standard Resistance


Tester Connection	Condition	Specified Condition
A80-25 (GND1) - Body ground	Always	Below 1 Ω

Result


Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

OK

RECONFIRM DTC

Reconnect the A80 skid control ECU (brake actuator assembly) connector.
Clear the DTC.
Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.
Check if the same DTC is recorded.
Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Tip:
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

Result


Proceed to
DTC C1241 is not output
DTC C1241 is output

DTC C1241 is not output

USE SIMULATION METHOD TO CHECK

DTC C1241 is output

REPLACE BRAKE ACTUATOR ASSEMBLY