BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Brake	Section: Brake Control/Dynamic Control System
Model Year: 2008	Model: LX570	Doc ID: RM000001EA300GX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570)

DTC

C1232/32

Stuck in Deceleration Sensor

DTC

C1234/34

Yaw Rate Sensor Malfunction

DTC

C1243/43

Acceleration Sensor Stuck Malfunction

DTC

C1244/44

Open or Short in Deceleration Sensor Circuit

DTC

C1245/45

Acceleration Sensor Output Malfunction

DTC

C1381/97

Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

The skid control ECU receives signals from the yaw rate and G sensor via the CAN communication system.

The yaw rate sensor has a built-in G sensor.

If there is trouble in the bus lines between the yaw rate and G sensor and the CAN communication system, the DTCs U0123/62 (yaw rate sensor communication trouble) and U0124/95 (G sensor communication trouble) are stored.

DTC Code	DTC Detection Condition	Trouble Area
C1232/32	At a vehicle speed of 10 km/h (6 mph) or more, the fluctuation range of the signal from one of either GL1 or GL2 is below 80 mV and the fluctuation range of the signal of the other is higher than 1.9 V for 30 seconds or more.	Yaw rate and G sensor Harness or connector CAN communication system
C1234/34	A sensor malfunction signal is received from the yaw rate sensor.	Yaw rate and G sensor Harness or connector CAN communication system
C1243/43	The following condition repeats 16 times. GL1 and GL2 do not change when the vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph).	Yaw rate and G sensor Harness or connector CAN communication system
C1244/44	When either of the following conditions is detected: 1. Both of the following conditions continue for at least 60 seconds. The vehicle is stopped. The difference between GL1 and GL2 does not drop less than 0.4 G after it reaches 0.6 G or more. 2. A data malfunction signal is received from the G sensor.	Yaw rate and G sensor Harness or connector CAN communication system
C1245/45	The following condition continues for at least 60 seconds. The difference between the values calculated from the G sensor value and vehicle speed exceeds 0.35 G.	Yaw rate and G sensor Harness or connector CAN communication system
C1381/97	A G sensor power source malfunction signal is received for at least 10 seconds at a speed of more than 3 km/h (2 mph).	Yaw rate and G sensor Harness or connector CAN communication system

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the yaw rate and G sensor, perform zero point calibration .

PROCEDURE

CHECK DTC

(a) Clear the DTCs .

(b) Turn the engine switch off.

(d) Check if the DTCs (U0073/94, U0123/62, C1210/36 and/or C1336/98) are output .

Result

Result	Proceed to
DTC U0073/94, U0123/62, C1210/36 and/or C1336/98 are not output.	A
DTC U0073/94 and/or U0123/62 are output.	B
DTC C1210/36 and/or C1336/98 are output.	C

2.	CHECK YAW RATE AND G SENSOR INSTALLATION

(a) Check that the yaw rate and G sensor is installed properly.

OK:

The sensor is tightened to the specified torque. The sensor is not tilted.

3.	INSPECT YAW RATE AND G SENSOR (IG AND GND TERMINAL)

(a) Disconnect the E50 yaw rate and G sensor connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
E50-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
E50-1 (GND) - Body ground	Always	Below 1 Ω

Result

Result	Proceed to
OK (When troubleshooting in accordance with the Diagnostic Trouble Code Chart)	A
OK (When troubleshooting in accordance with the Problem Symptoms Table)	B
NG	C