Circuit Description
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.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| C1742/42 | With the AIR SUS relay activated, a lock, open or short signal of the height control compressor motor is detected for 4 sec. or more. |
|
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.