Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001A67005X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1243/43,C1245/45; Acceleration Sensor Stuck Malfunction; 2007 MY LX470 [08/2006 -        ]

DTC

C1243/43

Acceleration Sensor Stuck Malfunction

DTC

C1245/45

Acceleration Sensor Output Malfunction

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

C1243/43

When vehicle speed becomes 0 km/h (0 mph) from 30 km/h (18 mph), and the condition that GL1 and GL2 signals of ECU terminals did not change 40 mV or less continued in a sequence 16 times.
  • Deceleration sensor
  • Wire harness for deceleration sensor system

C1245/45

At the vehicle speed of 30 km/h (18 mph) or more, and the condition that the difference between acceleration and deceleration values of computation from deceleration sensor and vehicle speed becomes more than 0.35 G continues for 60 sec. or more.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

PROCEDURE

1.

READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR)*1

(a) Check the DATA LIST for proper functioning of the deceleration sensor.

Skid control ECU assembly

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

DECELERAT SENS

G sensor (GL1 filter) /

Min.: -1.869 G, Max.:1.869

Approximately 0 +- 0.13 when vehicle is stationary

Reading changes when vehicle is bounced

DECELERAT SENS2

G sensor (GL1 filter) /

Min.: -1.869 G, Max.:1.869

Approximately 0 +- 0.13 when vehicle is stationary

Reading changes when vehicle is bounced

OK:

Deceleration value changes.

OK

REPLACE SKID CONTROL ECU ASSEMBLY

NG

2.

INSPECT YAW RATE SENSOR (INCLUDE DECELERATION SENSOR)*2

(a) Remove the console box and deceleration sensor.

(b) Connect 3 dry cell batteries of 1.5 V in series.

(c) Connect terminal 8 (VYS) to the batteries' positive (+) terminal and terminal 5 (GYAW) to the batteries' negative (-) terminal. Apply about 4.5 V between terminals 8 (VYS) and 5 (GYAW).

NOTICE:

Do not apply voltage of 6 V or more to terminals 8 (VYS) and 5 (GYAW).

(d) Measure the voltage when the sensor is tilted forward and rearward.

Standard voltage:

Tester Connection

Sensor Condition

Specified Condition

4 (GL1) - Battery's negative (-) terminal

Horizontal

Approximately 2.3 V

4 (GL1) - Battery's negative (-) terminal

Lean forward

2.3 to 3.5 V

4 (GL1) - Battery's negative (-) terminal

Lean rearward

1.0 to 2.3 V

2 (GL2) - Battery's negative (-) terminal

Horizontal

Approximately 2.3 V

2 (GL2) - Battery's negative (-) terminal

Lean forward

1.0 to 2.3V

2 (GL2) - Battery's negative (-) terminal

Lean rearward

2.3 to 3.5 V

HINT:

  • If the sensor is tilted too much, it may output the wrong value.
  • The sensor removed from the vehicle body should not be placed upside down.
NG

REPLACE YAW RATE SENSOR

OK

3.

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - YAW RATE SENSOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE SKID CONTROL ECU ASSEMBLY