BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1241; Low Power Supply Voltage Malfunction; 2016 MY Sienna [12/2015

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000000VIVO
Model Year Start: 2016	Model: Sienna	Prod Date Range: [12/2015 - 08/2016]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1241; Low Power Supply Voltage Malfunction; 2016 MY Sienna [12/2015 - 08/2016]

DTC

C1241

Low Power Supply Voltage Malfunction

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the 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 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 cleared when the IG1 terminal voltage returns to normal.

DTC Code	DTC Detection Condition	Trouble Area
C1241	Any of the following is detected: 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. When the solenoid relay remains ON and the IG1 terminal voltage is less than 9.5 V, the relay contact is open for 0.22 seconds or more. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply decreases for 60 seconds or more. When 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 0.22 seconds or more.	ECU-IG NO.1 fuse Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration and store system information (See page ).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

2.	INSPECT SKID CONTROL ECU (IG1 TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(b) Disconnect the skid control ECU connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A4-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

3.	INSPECT SKID CONTROL ECU (GND1 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
A4-1 (GND1) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

4.	RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTCs (See page ).

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

(e) Check if the same DTC is recorded (See page ).

Result

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

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page ).

CHECK FOR INTERMITTENT PROBLEMS

REPLACE BRAKE ACTUATOR ASSEMBLY