BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1244/44; Open or Short in Deceleration Sensor Circuit; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM000001A68005X
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1244/44; Open or Short in Deceleration Sensor Circuit; 2007 MY LX470 [08/2006 - ]

DTC

C1244/44

Open or Short in Deceleration Sensor Circuit

DESCRIPTION

This sensor detects vehicle deceleration. The sensor signal is used in ABS & BA & TRAC & VSC control. If the sensor functions abnormally, the ABS warning light comes on.

DTC No.	DTC Detection Condition	Trouble Area
C1244/44	One of the following 1., 2., 3. or 4. is detected: The condition that ECU terminals GL1 and GL2 values are -1.5 G or less or 1.5 G or more continues for 1.2 sec. or more. The condition that the deceleration sensor terminal VGS voltage is 4.4 V or less or 5.6 V or more continues for 1.2 sec. or more. At a vehicle speed of 0 km/h (0 mph), after the difference of output value between deceleration sensor terminals GL1 and GL2 becomes 0.6 G or more, and the condition that does not become 0.4 G or less continues for 60 sec. or more. Deceleration sensor signal momentary open occurs 7 times or more.	Deceleration sensor Deceleration sensor circuit

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 G when vehicle is stationary

Reading changes when vehicle is bounced

DECELERAT SENS2

G sensor (GL2 filter) /

Min.: -1.869 G, Max.: 1.869

Approximately 0 +- 0.13 G when vehicle is stationary

Reading changes when vehicle is bounced

OK:

Deceleration value changes.

REPLACE SKID CONTROL ECU ASSEMBLY

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 2.3 V
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.

REPLACE YAW RATE SENSOR

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

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE SKID CONTROL ECU ASSEMBLY