Suspension Control ( Automatic - Electronic Level )

DTC 42 HEIGHT CONTROL COMPRESSOR CIRCUIT

CIRCUIT DESCRIPTION

DTC Detecting Condition:

When "UP" side of the height control 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.

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

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

Wiring Diagram:

Step 1 - 4:

Step 5:

Step 6:

INSPECTION PROCEDURE