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Last Modified: 11-27-2007 1.6 J
Service Category: Power Source/Network Section: Networking
Model Year: 2008 Model: LX570 Doc ID: RM000001RSZ00MX
Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570)

ECM Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

ECM Communication Stop Mode

When either condition below is met:

  • "Engine" is not displayed on "CAN Bus Check".
  • Applies to "ECM Communication Stop Mode" in "DTC Combination Table".
  • Power source or ECM
  • ECM main wire or connector
  • ECM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


(a) Disconnect the A38 and C53 ECU connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C53-81 (E1) - Body ground

Always

Below 1 Ω

C53-42 (E02) - Body ground

C53-43 (E01) - Body ground

C53-82 (ME01) - Body ground

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A38-1 (BATT) - Body ground

Always

11 to 14 V

A38-2 (+B2) - Body ground

When battery positive (+) voltage is applied to terminal A38-34 (MREL)

A38-3 (+B) - Body ground
OK