C1752
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1752: Height Control Compressor Motor Circuit Malfunction
C1752 - Height Control Compressor Motor Circuit Malfunction
DESCRIPTION
The signal from the suspension control ECU turns on the suspension control relay. At that time, battery voltage is input to the height control compressor motor through the suspension control relay. The height control compressor motor starts.
WIRING DIAGRAM
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) 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.
PROCEDURE
1. INSPECT SUSPENSION CONTROL RELAY (AIR SUS)
(a) Turn the engine switch off.
(b) Remove the suspension control relay from the engine room No. 1 relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE SUSPENSION CONTROL RELAY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECU - COMPRESSOR, COMPRESSOR - BATTERY AND BODY GROUND)
(a) Remove the suspension control relay from the engine room No. 1 relay block.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(c) Disconnect the A57 compressor connector.
(d) Disconnect the A39 ECU connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT HEIGHT CONTROL COMPRESSOR (COMPRESSOR MOTOR)
(a) Remove the height control compressor Removal.
(b) Connect terminal 1 (B) to the battery positive (+) terminal, and terminal 2 (E) to the battery negative (-) terminal.
(c) Check the operating of the compressor motor.
OK:
Motor operates
NOTICE:
- Do not operate the height control compressor for 60 seconds or more.
- Since a short and a lock-up inside the height control compressor cause excessive current to flow, stop operation immediately when it does not rotate.
NG -- REPLACE HEIGHT CONTROL COMPRESSOR Removal
OK -- REPLACE SUSPENSION CONTROL ECU Removal