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

Toyota Venza Service Manual / Mf1a Transfer / 4wd / Awd / Active Torque Control 4wd System / 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	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. 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. 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

REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM)

REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (BRAKE CONTROL SYSTEM)

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

INSPECT CHARGING SYSTEM (2GR-FE)

INSPECT CHARGING SYSTEM (1AR-FE)

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)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	RECONFIRM DTC

(a) Clear the DTC (See page ).

(b) Start the engine.

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.

REPLACE AWD CONTROL ECU

CHECK INTERMITTENT PROBLEMS

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART ACTIVE TORQUE CONTROL 4WD SYSTEM DTC Code Detection Item Trouble Area See page C1241/94 Low Powe ...

Control Module Communication Bus OFF (U0073/86,U0100/85,U0129/83)

DESCRIPTION The AWD control ECU inputs the signals sent from the ECM and skid control ECU via the CAN communication system. When DTCs indicating a CAN communication system malfunction ...

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