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: RM000001CTP006X
Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570)

DTC

C1756

Suspension Control Relay Malfunction

DESCRIPTION

This relay is to supply the power source to the pump and motor. The relay stays on while the height control is operated.

DTC Code	Detection Condition	Trouble Area
C1756	When either of the following is detected: With the suspension control relay not activated, an open signal of the suspension control relay is detected for 1 second or more. With the suspension control relay activated, a short signal of the suspension control relay is detected 8 times successively.	Harness or connector Suspension control relay 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 BLOCK 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