STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1527/27,C1528/28; VGRS Actuator Malfunction; 2006 MY LX470 [05/2005

Last Modified: 4-30-2014	6.6 C	Doc ID: RM000001F69000X
Model Year: 2006	Model: LX470	Prod Date Range: [05/2005 - ]
Title: STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1527/27,C1528/28; VGRS Actuator Malfunction; 2006 MY LX470 [05/2005 - ]

DTC

C1527/27

VGRS Actuator Malfunction

DTC

C1528/28

VGRS Actuator Malfunction

DESCRIPTION

The VGRS ECU detects the actuator operation with the turning angle sensor. If a malfunction in the turning angle sensor is found, the VGRS ECU turns on the warning light and records the DTC.

DTC No.	DTC Detection Condition	Trouble Area
C1527/27	The system detects that the difference between the actuator target angle and the actuator position is approximately 30° or more for 1 sec.	VGRS actuator VGRS ECU
C1528/28	The system detects a momentary interruption of the motor rotating angle sensor signal (MSU, MSV and MSW) 10 times or an open circuit for 0.12 sec. minimum.	VGRS actuator VGRS ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK MV WIRE FOR OPEN CIRCUIT

(a) Check for DTC .

OK:

DTC C1561/61 is output.

Go To DTC C1561/61

2.	OBSERVE DATA FOR MTR REV ANG U, V, W ON INTELLIGENT TESTER

HINT:

Determine the trouble area by checking the motor revolution angle sensor signal with the intelligent tester. When not using the intelligent tester, go to *.

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Start the engine.

(d) Check the motor revolution angle sensor signal when slowly turning the steering wheel referring to the DATA LIST.

OK:

MTR REV ANG U High or Low

MTR REV ANG V: High or Low

MTR REV ANG W: High or Low

Result

Result	Proceed to
All OK	A
ALL NG	B
Others	C

REPLACE VGRS ECU

GO TO STEP 4

3.	CHECK GND CIRCUIT OF MOTOR REVOLUTION ANGLE SENSOR *

(a) Turn the ignition switch OFF.

(b) Check the continuity between terminal V13-7 (MGND) and V11-6 (GND) of the VGRS ECU.

OK:

Continuity

REPLACE VGRS ECU

4.	CHECK MOTOR REVOLUTION ANGLE SENSOR SIGNAL

(a) Disconnect the V13 VGRS actuator connector.

CAUTION:

Do not apply 12 V to 10 (MV) for more than 3 minutes.

(b) Connect the positive (+) lead from the battery to terminal V13-10 (MV) and the negative (-) lead to terminal V13-3 (LGND).

(c) Measure the resistance between terminals while slowly turning the steering wheel. The steering wheel must be turned a maximum of + - 10°from center.

Standard resistance:

Tester Connection	Specified Condition
2 (MSW) - 7 (MGND)	Below 1 k Ω or above 100 k Ω
4 (MSU) - 7 (MGND)
8 (MSV) - 7 (MGND)

REPLACE VGRS ACTUATOR

REPLACE VGRS ECU