Toyota Venza manuals

Toyota Venza: Low Power Supply Voltage (C1241/94)

DESCRIPTION

If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU or in a speed sensor occurs, the AWD control ECU will prohibit operations by the fail-safe function.

DTC No.

DTC Detection Condition

Trouble Area

C1241/94

  1. When the following continues for 10 seconds or more:
    • At a vehicle speed of 2 mph (3 km/h) or more, the IG1 terminal voltage is 9.5 V or less.
  2. When either of the following is detected:
    • With the IG1 terminal voltage 9.5 V or less, communication with the skid control ECU is impossible.
    • Vehicle speed sensor voltage is reduced for 60 seconds or more.
  3. When the following continues for 3 seconds or more:
    • The IG1 terminal voltage 17 V or more.
  • Battery
  • ECU-IG No.1 fuse
  • Wire harness and connector (IG1 circuit, GND circuit)
  • Brake control system
  • CAN communication system
  • AWD control ECU

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

Check the condition of each related circuit connector before troubleshooting (See page ).


PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND BRAKE CONTROL SYSTEM)

(a) Check if the CAN communication system DTC is output (See page ).


(b) Start the engine.

(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more, and check if the speed sensor DTC (brake control system DTC) is output (See page ).


Result

Proceed to

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

A

CAN communication system DTC is output

B

Speed sensor DTC (brake control system DTC) is output

C


B

REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM)


C

REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (BRAKE CONTROL SYSTEM)


A

2.

INSPECT BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

Result

Proceed to

OK

A

NG (2GR-FE)

B

NG (1AR-FE)

C


B

INSPECT CHARGING SYSTEM (2GR-FE)


C

INSPECT CHARGING SYSTEM (1AR-FE)


A

3.

CHECK WIRE HARNESS (AWD CONTROL ECU - BATTERY)


(a) Disconnect the ECU connector.

(b) Measure the voltage of the wire harness side connector.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D38-11 (IG1) - Body Ground

Ignition switch ON

11 to 14 V

Text in Illustration

*1

Rear view of wire harness connector

(to AWD Control ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

CHECK WIRE HARNESS (AWD CONTROL ECU - BODY GROUND)


(a) Disconnect the ECU connector.

(b) Measure the resistance of the wire harness side connector.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D38-23 (GND) - Body Ground

Always

Below 1 Ω

Text in Illustration

*1

Rear view of wire harness connector

(to AWD Control ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

RECONFIRM DTC

(a) Clear the DTC (See page ).


(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.

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 AWD CONTROL ECU


B

CHECK INTERMITTENT PROBLEMS

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