SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Suspension	Section: Suspension Control System
Model Year: 2008	Model: LX570	Doc ID: RM000001CU9006X
Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570)

DTC

C1763

Abnormal Pump Motor Oil Pressure

DESCRIPTION

DTC Code	Detection Condition	Trouble Area
C1763	While the motor relay is in operation, the condition that the fluid pressure is 0.6 MPa (6.1 kgf/cm², 87 psi) or less continues for 0.6 seconds.	Harness or connector Suspension control relay Height control pump and motor Suspension control ECU

NOTICE:

If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed .

1.	INSPECT SUSPENSION CONTROL RELAY (AHC)

(a) Remove the suspension control relay from the engine room relay block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage is not applied to terminal 1 and 2	10 kΩ or higher
3 - 5	Battery voltage is applied to terminal 1 and 2	Below 1 Ω

2.	CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - RELAY (AHC) AND BODY GROUND)

(a) Remove the suspension control relay from the engine room relay block.

(b) Disconnect the K32 ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K32-16 (RC) - Relay block suspension control relay terminal 1	Always	Below 1 Ω
K32-16 (RC) - Body ground	Always	10 kΩ or higher
Relay block suspension control relay terminal 2 - Body ground	Always	Below 1 Ω

3.	CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL RELAY)

(a) Remove the suspension control relay from the engine room relay block.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Relay block suspension control relay terminal 5 - Body ground	Always	11 to 14 V

4.	CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL RELAY - PUMP AND MOTOR AND BODY GROUND)

(a) Remove the suspension control relay from the engine room relay block.

(b) Disconnect the L44 pump and motor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Relay block suspension control relay terminal 3 - L44-2	Always	Below 1 Ω
Relay block suspension control relay terminal 3 - Body ground	Always	10 kΩ or higher
L44-1 - Body ground	Always	Below 1 Ω

5.	CHECK OPERATION OF HEIGHT CONTROL PUMP AND MOTOR

(a) Remove the height control pump and motor .

(b) Apply battery voltage to the height control pump and motor and check the operation of the motor.

OK:

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1	Motor operates

Measurement Condition

Specified Condition

Battery positive (+) → Terminal 2

Battery negative (-) → Terminal 1

Motor operates

NOTICE:

Be careful of fluid spray when the height control pump and motor is operating.
Do not allow the motor to operate for 60 seconds or more.
If the height control pump and motor is shorted, locked, or has a similar type of malfunction, a large amount of current will be flowing. Therefore, if the motor does not operate, immediately stop this inspection.