C1761

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1761: Continuous Electric Current to Height Control Compressor Motor
C1761 - Continuous Electric Current to Height Control Compressor Motor

DESCRIPTION

The signal from the suspension control ECU operates the suspension control relay and the height control compressor motor starts. The height control compressor motor operates until the targeted vehicle height is reached. Then the height control sensor sends the signal to the suspension control ECU. Then, the suspension control ECU stops the height control compressor motor.

INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Electronic Circuit Inspection Procedure; 2) DTC inspection; and 3) the Techstream inspection (Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.
- The system may output DTC C1761 even when the system is normal if one of the following occurs: 1) the vehicle is full of passengers and the luggage compartment is full; 2) the vehicle is being driven or is stopped on an irregular surface; or 3) the air ducts are frozen.
- When refilling the air, when a current is applied to the height control compressor for 3 minutes or more, DTC C1761 may be output.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Air Suspension System.

NEXT -- Continue to next step.

2. INSPECT FOR AIR LEAK

(a) Check for air leak Operation Check.

OK:

No leaks.

NG -- REPAIR OR REPLACE AIR TUBE
OK -- Continue to next step.

3. INSPECT IF FRONT HEIGHT CONTROL VALVE IS STUCK

(a) Remove the front height control valve Removal.

(b) Check the front height control valve (valve RH).

(1) Apply 12 V battery voltage to the control valve and check the operation of the valve RH.

OK:

(1) Apply 12 V battery voltage to the control valve and check the operation of the valve LH.

OK:

NG -- REPLACE FRONT HEIGHT CONTROL VALVE Removal
OK -- Continue to next step.

4. INSPECT IF REAR HEIGHT CONTROL VALVE IS STUCK

(a) Remove the rear height control valve Removal.

(b) Check the rear height control valve (valve RH).

(1) Apply 12 V battery voltage to the control valve and check the operation of the valve RH.

OK:

(1) Apply 12 V battery voltage to the control valve and check the operation of the valve LH.

OK:

NG -- REPLACE REAR HEIGHT CONTROL VALVE Removal
OK -- Continue to next step.

5. INSPECT IF HEIGHT CONTROL COMPRESSOR IS STUCK

(a) Remove the height control compressor Removal.

(b) Inspect if the exhaust valve is stuck.

(1) Apply 12 V battery voltage to the exhaust valve and check the operation of the valve.

OK:

(1) Apply 12 V battery voltage to the compressor motor and check the operation of the motor.

OK:

NOTICE:
- Do not allow the motor to operate for approximately 60 seconds or more.
- If the compressor 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.

NG -- REPLACE HEIGHT CONTROL COMPRESSOR Removal
OK -- Continue to next step.

6. INSPECT SUSPENSION CONTROL RELAY (AIR SUS)

(a) Turn the power switch OFF.

(b) Remove the suspension control relay from the engine room No. 5 relay block.

NG -- REPLACE SUSPENSION CONTROL RELAY

OK -- REPLACE SUSPENSION CONTROL ECU Removal