C1742

DTC C1742/42 Height Control Compressor Circuit

DESCRIPTION

DTC Detecting Condition:

When the "UP" side of the height control switch is pressed, a signal is sent from terminal RC of the suspension control ECU to switch the AIR SUS relay ON. As a result, the relay contacts close and the compressor motor turns on, producing compressed air.

The suspension control ECU detects the amount of current flow to the compressor motor by means of the differences in potential at terminals RM+ and RM- of the suspension control ECU. In this way, the suspension control ECU monitors the compressor circuit for abnormalities.

HINT: Once the ECU stores DTC C1742/42 in the memory, the vehicle height control is not carried out until the normal signal is input to the ECU from the compressor motor. However, the control automatically resumes approx. 70 min. after the ignition switch is turned ON.

Wiring Diagram:

Step 1-3:

Step 4-5:

Step 5(Continued)-6:

INSPECTION PROCEDURE