Toyota Venza manuals

Toyota Venza: Main Body ECU Communication Stop Mode

Toyota Venza Service Manual / Networking / Can Communication System / Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Main Body ECU Communication Stop Mode

  • "Main Body" is not displayed on "CAN Bus Check" screen of the Techstream.
  • Applies to Main Body ECU Communication Stop Mode in DTC Combination Table.
  • Power source circuit of main body ECU
  • Main body ECU branch wire or connector
  • Main body ECU (Driver side junction block)

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CHECK CAN BUS WIRE FOR DISCONNECTION (MAIN BODY ECU BRANCH WIRE)

(a) Turn the ignition switch off.

(b) Disconnect the connector of the main body ECU.

Text in Illustration

*1

Front view of wire harness connector

(to Main Body ECU)


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D48-5 (CANH) - D48-6 (CANL)

Ignition switch off

54 to 69 Ω


NG

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU BRANCH WIRE)


OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Disconnect the connector of the driver side junction block.

Text in Illustration

*1

Front view of wire harness connector

(to Driver Side Junction Block)


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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2C-24 (BECU) - Body ground

Always

11 to 14 V


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)


OK

3.

CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Disconnect the connector of the driver side junction block.

Text in Illustration

*1

Front view of wire harness connector

(to Driver Side Junction Block)


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2F-16 (GND1) - Body ground

Always

Below 1 Ω


OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

ECM Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area ECM Communication Stop Mode "Engine" and "ECT" are not disp ...

Power Management Control ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Power Management Control ECU Communication Stop Mode "Electric Power Contr ...

Other materials about Toyota Venza:

How To Use This Manual
General Information GENERAL INFORMATION 1. GENERAL DESCRIPTION (a) This manual is written in accordance with SAE J2008. (b) Repair operations can be separated mainly into the following 3 processes: (1) Diagnosis (2) Removing / Installing, Replacing, Di ...

Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: Perform "Inspection After Repair" after replacing the camshaft, No. 2 camshaft, camshaft timing gear assembly or camshaft timing exhaust gear assembly (See page ). PROCEDURE 1. INSTALL NO. 2 CAMSHAF ...

Communication Malfunction between ECUs Connected by LIN (B2785)
DESCRIPTION This DTC is stored when LIN communication from the certification ECU stops for a certain amount of time. DTC No. DTC Detection Condition Trouble Area B2785 Errors in LIN co ...

© 2016-2019 Copyright www.tovenza.com

0.1894