Toyota Venza: Low Battery Positive Voltage or Abnormally High Battery Positive Voltage (C1241/41)

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Low Battery Positive Voltage or Abnormally High Battery Positive Voltage (C1241/41)

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 cancelled when the IG1 terminal voltage returns to normal.

DTC Code	DTC Detection Condition	Trouble Area
C1241/41	Any of the following is detected: IG1 terminal voltage is 16.7 V or more. IG1 terminal voltage is 9.6 V or less when ABS does not operate. IG1 terminal voltage is 9.2 V or less when ABS operates.	ECU-IG NO. 2 fuse Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU

WIRING DIAGRAM

PROCEDURE

1.	INSPECT ECU-IG NO. 2 FUSE

(a) Remove the ECU-IG NO. 2 fuse from the main body ECU (driver side junction block).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ECU-IG NO. 2 (7.5 A) fuse	Always	Below 1 Ω

Text in Illustration

*1	Main Body ECU (Driver Side Junction Block)
*2	ECU-IG NO. 2 Fuse

REPLACE ECU-IG NO. 2 FUSE

2.	CHECK BATTERY

(a) Install the ECU-IG NO. 2 fuse.

(b) Check the battery voltage.

Standard Voltage:

11 to 14 V

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2GR-FE)

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 1AR-FE)

3.	INSPECT SKID CONTROL ECU (IG1 TERMINAL)

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

(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
A42-28 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

4.	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
A42-4 (GND1) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

5.	RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTCs (See page ).

(d) Perform a road test.

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

Result	Proceed to
DTC (C1241/41) is not output	A
DTC (C1241/41) 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

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