NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Power Source/Network	Section: Networking
Model Year: 2008	Model: LX570	Doc ID: RM0000038YW002X
Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570)

DTC

U0114/38

Lost Communication with 4WD Control ECU

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
U0114/38	There is no communication from the 4WD control ECU.	Power source circuit of 4WD control ECU 4WD control ECU 4WD control ECU branch wire or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistance of the main wire and the branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

w/ Navigation System:

After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

When disconnecting the cable, some systems need to be initialized after the cable is reconnected .

2.	CHECK FOR OPEN IN CAN BUS WIRE (4WD CONTROL ECU BRANCH WIRE)

(a) Disconnect the A27 4WD control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A27-19 (CAN+) - A27-20 (CAN-)	Engine switch off	54 to 69 Ω

3.	CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected .

(b) Disconnect the A28 4WD control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-4 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A28-3 (IG) - Body ground	Engine switch on (IG)	11 to 14 V