Toyota Venza manuals

Toyota Venza: Diagnosis System

DIAGNOSIS SYSTEM

1. DESCRIPTION

Active torque control 4WD system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. Therefore when there seems to be a problem with the active torque control 4WD system, use the Techstream or SST to check and troubleshoot it.

2. CHECK DLC3

(a) The ECU uses CAN (ISO11898-1) and ISO9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO9141-2 format.


Verify the conditions listed in the table below.

Symbol (Terminal No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus + line

During transmission

Pulse generation

CG (4) - Body Ground

Chassis ground

Always

Below 1 Ω

SG (5) - Body Ground

Signal ground

Always

Below 1 Ω

BAT (16) - Body Ground

Battery positive

Always

10 to 14 V

CANH (6) - CANL (14)

CAN bus line

Ignition switch off*

54 to 69 Ω

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch off*

200 Ω or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch off*

200 Ω or higher

CANH (6) - BAT (16)

HIGH-level CAN bus line

Ignition switch off*

6 kΩ or higher

CANL (14) - BAT (16)

LOW-level CAN bus line

Ignition switch off*

6 kΩ or higher

NOTICE:

*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, other switches or the doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

HINT:

Connect the cable of the Techstream to the DLC3, turn the ignition switch to ON and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream.

  • If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
  • If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream instruction manual.

3. WARNING LIGHT

(a) When a problem occurs in the active torque control 4WD system, the AWD warning light on the combination meter comes on to inform the driver of the problem.


Terminals Of Ecu
TERMINALS OF ECU 1. CHECK AWD CONTROL ECU (a) Measure the voltage and resistance of the connector. Terminal No. (Symbol) Terminal Description Condition ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (When Using Techstream) (a) Check the DTCs. (1) Connect the Techstream to the DLC3. (2) Turn the ignition switch to ON. (3) Turn the Techstream on. (4) Read the DT ...

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Back-up Power Source Circuit
DESCRIPTION The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when the ignition switch is turned off. The power is used for diagnostic trouble code memory, etc. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE ...

Brake Warning Light Remains ON
DESCRIPTION The skid control ECU is connected to the combination meter via CAN communication. If any of the following is detected, the brake warning light remains on: The skid control ECU connector is disconnected from the skid control ECU. T ...

Open in Stop Light Switch Circuit (C1249/49)
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