Dodge Caliber. Manual — part 156
INTEGRATED CONTROL UNIT (ICU)
DESCRIPTION
The Hydraulic Control Unit (HCU) (2) and the Antilock
Brake Module (ABM) (1) used with this antilock brake
system are combined (integrated) into one unit, which
is called the Integrated Control Unit (ICU).
The ICU (1) is located in the engine compartment,
mounted to the right side body frame rail near the
strut tower.
Two different ICU’s are used on this vehicle depending on whether or not the vehicle is equipped with traction con-
trol and Electronic Stability Program (ESP). The HCU on a vehicle equipped with traction control or ESP has a valve
block that is approximately one inch longer than a HCU on a vehicle that is equipped with ABS only.
The ABS-only ICU consists of the following components: the ABM, eight (build/decay) solenoid valves (four inlet
valves and four outlet valves), valve block, fluid accumulators, a pump, and an electric motor.
The ABS with ESP and All-Speed Traction Control ICU consists of the following components: the ABM, 12 (build/
decay) solenoid valves, two traction control solenoid valves, two hydraulic shuttle valves, valve block, fluid accumu-
lators, a pump, and an electric pump/motor.
The replaceable components of the ICU are the HCU and the ABM. No attempt should be made to service any
components of the HCU or ABM.
For additional information on the ABM, (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ANTILOCK
BRAKE MODULE - DESCRIPTION). For additional information on the HCU, (Refer to 5 - BRAKES - ABS/HYDRAU-
LIC/MECHANICAL/HCU (HYDRAULIC CONTROL UNIT) - DESCRIPTION).
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BRAKES - ABS SERVICE INFORMATION
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OPERATION
For information of the ICU, refer to these individual components of the ICU:
•
ANTILOCK BRAKE MODULE (ABM) (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/AN-
TILOCK BRAKE MODULE - DESCRIPTION)
•
HYDRAULIC CONTROL UNIT (HCU) (Refer to 5 - BRAKES - ABS/HYDRAULIC/MECHANICAL/HCU
(HYDRAULIC CONTROL UNIT) - OPERATION)
REMOVAL
GAS ENGINE
NOTE: Before proceeding, (Refer to 5 - BRAKES - WARNING) (Refer to 5 - BRAKES - CAUTION).
1. Disconnect and isolate battery negative cable from battery post.
2. Using a brake pedal holding tool as shown,
depress the brake pedal past its first one inch of
travel and hold it in this position. This will isolate
the master cylinder from the brake hydraulic sys-
tem and will not allow the brake fluid to drain out of
the master cylinder reservoir while the lines are
disconnected.
3. Remove the engine appearance cover.
4. Loosen lower and upper mounting nuts, then
remove the exhaust heat shield from the dash
panel.
5. Pull the brake tube bundle routing clips (with tubes)
loose from studs on the dash panel.
6. Remove the primary (4) and secondary (1) brake
tubes (from master cylinder) at the hydraulic control
unit (7).
7. Remove the remaining brake tubes (2, 3, 5, 6) at
the hydraulic control unit (7).
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BRAKES - ABS SERVICE INFORMATION
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8. Remove the screw (1) fastening the power steering
pressure hose routing clamp (2) to the exhaust
manifold.
NOTE: Use this figure in the following step to
release the ABM harness connector cover. It
shows the location of the release tabs.
9. Disconnect the ABM harness connector from the
Antilock Brake Module (ABM). To do so:
a. Depress the tabs on each side of the connec-
tor cover, then
b. Pull outward and upward on the lower half of
the cover until it locks into position pointing
straight outward (2). The connector can then
be pulled straight outward off the ABM (1).
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BRAKES - ABS SERVICE INFORMATION
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10. Loosen, but do not remove, the two mounting
screws (2) attaching the ICU (1) mounting bracket
to the body.
11. Lift the ICU and mounting bracket (1) off the
mounting screws (2).
12. Move the brake tubes around as necessary with-
out bending them and remove the ICU with
bracket through the opening between the A/C
lines and the exhaust manifold.
13. To separate the ABM from the HCU, (Refer to 5 -
BRAKES/HYDRAULIC/MECHANICAL/ICU (INTE-
GRATED CONTROL UNIT) - DISASSEMBLY).
DIESEL ENGINE
NOTE: Before proceeding, (Refer to 5 - BRAKES - WARNING) (Refer to 5 - BRAKES - CAUTION).
1. Disconnect and isolate battery negative cable from battery post.
2. Using a brake pedal holding tool as shown,
depress the brake pedal past its first one inch of
travel and hold it in this position. This will isolate
the master cylinder from the brake hydraulic sys-
tem and will not allow the brake fluid to drain out of
the master cylinder reservoir while the lines are
disconnected.
3. Raise and support the vehicle. (Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCE-
DURE)
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BRAKES - ABS SERVICE INFORMATION
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