Last Modified: 4-30-2014 6.6 C Doc ID: RM000001A6Y001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1291/48; VGRS ECU Communication Error; 2006 MY LX470 [05/2005 -        ]

DTC

C1291/48

VGRS ECU Communication Error

DESCRIPTION

The circuit is used to send TRAC & VSC control information from the skid control ECU to the VGRS ECU (VSC+, VSC-), and VGRS control information from the VGRS ECU to the skid control ECU (AFS+, AFS-).

DTC No.

DTC Detection Condition

Trouble Area

C1291/48

Either of the following 1. or 2. continues for 5 sec.:

  1. ECU IG1 terminal voltage is 9.5 V to 17.0 V and data transmission to the VGRS ECU is impossible.
  2. ECU IG1 terminal voltage is 9.5 V to 17.0 V and receiving data from the VGRS ECU is impossible.
  • AFS+ or AFS- circuit
  • VSC+ or VSC- circuit
  • VGRS ECU
  • Skid control ECU assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK SKID CONTROL ECU COMMUNICATION

(a) Remove the skid control ECU.

(b) Connect an oscilloscope to terminals AFS+ and AFS- or VSC+ and VSC- of skid control ECU.

(c) Start the engine, and check the signal waveform.

OK:

A waveform is output, as shown in the illustration.
NG

REPLACE SKID CONTROL ECU ASSEMBLY

OK

2.

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - VGRS ECU)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE VGRS ECU