Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ICU (Integrated Control Unit): Description
The hydraulic control unit (HCU) and the controller antilock brake (CAB) used with this antilock brake system are combined (integrated) into one unit, which is called the integrated control unit (ICU) (Fig 1 ). The ICU is located below the master cylinder in the engine compartment. It is mounted to the left frame rail.
The ABS ICU consists of the following components: the CAB, eight (build/decay) solenoid valves (four inlet valves and four outlet valves) and one hydraulic pump motor.
The ABS ICU with traction control consists of the following components: the CAB, eight (build/decay) solenoid valves (four inlet valves and four outlet valves), two master cylinder isolation valves, two low pressure feed valves and one hydraulic pump motor.
The replaceable components of the ICU are the HCU and the CAB. No attempt should be made to service any individual components of the HCU or CAB. For information on the CAB, (Refer to CONTROLLER ANTILOCK BRAKE ).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.