C1742

DTC C1742 Height Control Compressor Circuit

CIRCUIT DESCRIPTION

DTC Detection Condition:

While the vehicle height is raised, a signal is sent from terminal RC of the ECU to switch the height control relay ON. As a result, the relay contacts close and the compressor motor turns, producing compressed air. At this time, the ECU senses the amount of current flow to the compressor motor by means of the differences in potential at the terminals RM+ and RM- of the ECU. In this way, the ECU monitors the compressor circuit for abnormalities.

Once the ECU stores DTC C1742/42 in memory, the vehicle height control is not carried out until the normal signal is input to the ECU from the compressor motor.

The control is resumed, however, approx. 70 min. after the ignition switch is turned on.

Wiring Diagram:

Step 1:

Step 2 - 3:

Step 4 - 5:

Step 6 - 7:

INSPECTION PROCEDURE