Circuit Description

DTC

DTC No.

DTC Detecting Condition

Trouble Area

C1751/51⁽¹⁾

With the AIR SUS relay activated, the vehicle does not go up to the standard vehicle height after the 100 sec. elapsed.

Height control compressor assy
Height control compressor circuit
Height control sensor link sub-assy rear
Height control sensor sub-assy rear
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

⁽¹⁾

The relief pressure of the compressed air is 980 kPa (10 kgf/cm² , 142 psi). If the vehicle height control is attempted on a steeply sloping road, when the vehicle is overloaded, or when the vehicle is jacked up with the engine running, the compressor motor operates continuously to raise vehicle height, and causes electric current to flow to the AIR SUS relay for 100 sec. or longer.

Thus DTC C1751/51 may be output and vehicle height control may be suspended (This is not abnormal.). In this case, however, the vehicle height operation is resumed approx. 10 min. after the ignition switch is turned ON after the ECU detects the first error. If ECU detects another error, it takes 70 minutes until the control is resumed.