The ECS is the abbreviation for "Electronic Control Suspension". This ECS system automatically controls the height of a vehicle level and the damping force of shock absorbers according to road condition. So it improves riding comfort and steering stability. Among components of the ECS system, a height sensor is set up between an axle and an chassis body. And this sensor measures the height of an vehicle and gives it to ECS ECU. This height sensor converts the movement of rod into pulses. And ECS ECU receives these pulses and becomes aware of a vehicle's height.
The ECS ECU monitors the PWM output signals of height sensor and if it is out of normal range, this DTC is set.
Item
Detecting Condition
Possible cause
DTC Strategy
Monitoring the PWM signals of height sensor
Open or short in the rear-left height sensor
Faulty rear-left height sensor
Threshold value
Case 1
When the frequency of the PWM signal is less than 588 Hz or more than 1000 Hz
Case 2
When abnormal PWM signal is outputted
Fail-Safe
Airspring
In a case of one sensor's failure
- Controlling a vehicle height by three sensors
In a case of two or more sensor's failure
- Inhibition of a vehicle level control
CDC
damper
Stopping the CDC damper's output ( 0 mA) or Controlling current at certain value ( 600 mA)