DTC C1751/51: Continuous Electric Current to Height Control Compressor: Description

The signal from the suspension control ECU operates the air suspension relay, and the height control compressor motor starts.

The height control compressor assembly operates until the targeted vehicle height is reached. Then the height control sensor sub-assembly sends the signal to the suspension control ECU, and stops the height control compressor.

DTC No.	DTC Detecting Condition	Trouble Area
C1751/51	When the ECU detects (a) or (b) for 1 trip, it outputs DTCs. (a) Continuity exists for 2 minutes in total within past 4 minutes. (b) Continuity has existed for more than 100 seconds in succession.	Height control compressor motor Height control compressor circuit Height control sensor link sub-assembly Height control sensor sub-assembly Relief valve AIR SUS relay comes off Air leakage from the air tube or each valve Clogging in the air tube or each valve Suspension control ECU