K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Suspension Strut / Shock Absorber: Description and Operation
SHOCK ABSORBER
The damper consists of an in-piston two position solenoid with a 1.5-3.3 ohm coil. The response time of the damper is less than 40 ms. The damper is
using movement of oil through an orifice for the damping effect.
The suspension damper solenoid is driven ON and OFF by the ESC module. To activate the solenoid, it is initially subjected to full battery voltage for a
short period of time. Once the solenoid is pulled-in, the supply voltage is pulse width modulated (PWM). The amount the suspension damper solenoid is
activated is based on inputs from the driver Tow/Haul switch, road inputs, position sensor inputs and the powertrain control module (PCM). The ESC
module provides a common ground for all 4 of the suspension damper solenoids.
