Toyota Venza manuals

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:

  1. IG1 terminal voltage is 16.7 V or more.
  2. IG1 terminal voltage is 9.6 V or less when ABS does not operate.
  3. 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


NG

REPLACE ECU-IG NO. 2 FUSE


OK

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


B

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


C

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


A

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.

(c) Turn the ignition switch to ON.

(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))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)


OK

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))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)


OK

5.

RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTCs (See page ).


(c) Start the engine.

(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 ).



A

CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE BRAKE ACTUATOR ASSEMBLY

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