AC system FORD MUSTANG 2003 Workshop Manual

z
Bleed Hydro-Boost. For additional information, refer to Hydro - Boost Bleeding in this
section.
z Bleed the brake system. For additional information, refer to Section 206 - 00 . Klj . 4 ba
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DESCRIPTION AND OPERATION
Anti-
Lock Control
The four wheel anti- lock brake system (4WABS) consists of the following components:
z anti- lock brake control module (2C346)
z front anti- lock brake sensor (2C205)
z front anti- lock brake sensor indicator (2C182)
z hydraulic control unit (2C286)
z rear anti- lock brake sensor (2C216)
z rear anti- lock brake sensor indicator (2C189)
z yellow anti- lock brake system (ABS) warning indicator
SECTION 206-
09A: Anti-Lock Control — Rear 2003 Mustang Workshop Manual Klj . 1 ba
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DIAGNOSIS AND TESTING
Anti-
Lock Control
Refer to Wiring Diagrams Cell 42 , Anti-
Lock Brake for schematic and connector information.
Principles of Operation
The anti- lock brake control module receives wheel speed readings from each anti- lock brake sensor
and processes this information to determine if an ABS event is necessary. The anti- lock brake sensor
electrically senses each tooth of the anti- lock brake sensor indicators as it passes through the anti- lock
brake sensor's magnetic field.
The anti- lock brake control module continuously monitors and compares the rotational speed of each
wheel, and when it detects an impending wheel lock, modulates hydraulic brake pressure to the
appropriate brake caliper. This is accomplished by the anti- lock brake control module triggering the
hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected
wheel returns to normal speed, the anti- lock brake control module returns the solenoid valves to their
normal position, and normal (base) braking resumes.
The anti- lock brake control module is self- monitoring. When the ignition switch is turned to the RUN
position, the anti- lock brake control module will do a preliminary electrical check, and at approximately
12 km/h (8 mph) the pump motor is turned on for approximately one half- second. Any malfunction of
the ABS will cause the ABS to shut off and the yellow ABS warning indicator to illuminate, however,
normal power assisted braking remains.
The ABS control module has the ability to store multiple DTCs in memory.
Inspection and Verification
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage.
SECTION 206-
09A: Anti-Lock Control — Rear 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent scan
tool 73 Digital Multimeter or
equivalent
105-
R0051 Klj . 1 ba
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3. If the concern remains after the inspection, connect the scan tool to the data link connector
(DLC) located beneath the instrument panel and select the vehicle to be tested from the scan
tool menu. If the scan tool does not communicate with the vehicle: 1. Check that the program card is correctly installed.
2. Check the connections to the vehicle.
3. Check the ignition switch position.
4. If the scan tool still does not communicate with the vehicle, refer to the scan tool Manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with: 1. CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00.
2. NO RESP/NOT EQUIP for the anti- lock brake control module, Go To Pinpoint Test A .
3. SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self- test diagnostics for the anti-lock brake
control module.
6. If the DTCs retrieved are related to the concern, go to the Anti- Lock Brake Control Module
Diagnostic Trouble Code (DTC) Reference Chart to continue diagnostics.
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics.
Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index
NOTE: If a wheel speed signal fault or a pump motor fault is detected, the yellow ABS warning
indicator cannot be reset with the key OFF and key ON method. The vehicle must be driven over 12
km/h (8 mph) for the anti- lock brake control module to carry out a re- check of the system before the
yellow ABS warning indicator is turned OFF. Visual Inspection Chart Mechanical Electrical
z
Low brake fluid
z Anti- lock brake sensor
z Anti- lock brake sensor indicator
z Base brake system z
Central junction box (CJB)Fuse:
„15 (10A)
„ 29 (15A)
„ 33 (15A)
„ 35 (15A)
z Battery junction box (BJB) Fuse:
„ABS 1 (50A)
„ ABS 2 (20A)
z Circuitry
z Damaged or corroded connectors
z Yellow ABS warning indicator
z Loose grounds
Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1318 Battery Voltage Low ABS Go To Pinpoint Test C .
B1342 ECU Is Defective ABS INSTALL a new anti-
lock brake control module;
REFER to Module . REPEAT the self-
test. B1484 Brake Pedal Input Open Circuit ABS Go To Pinpoint Test D . Klj . 2 ba
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Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-
LOCK
BRAKE CONTROL MODULE warning indicator
system. Test K .
z Base brake
system. z
REFER to
Section 206 -
00 .
z Poor vehicle tracking during
anti- lock function z
Air in the brake
system. z
Go To Pinpoint Test L .
z Hydraulic control
unit (HCU).
z Base brake
system. z
REFER to
Section 206 -
00 .
Test Step Result / Action to
Take A1 CHECK CIRCUIT 601 (LB/PK) FOR AN OPEN
z
Key in OFF position.
z Disconnect: Anti- Lock Brake Control Module C135.
z Key in ON position.
z Measure the voltage between anti- lock brake control module C135
Pin 8, Circuit 601 (LB/PK), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
A2 .
No
REPAIR the circuit.
REPEAT the self-
test. A2 CHECK THE ANTI-
LOCK BRAKE CONTROL MODULE GROUNDS z
Measure the resistance between anti- lock brake control module
C135 Pin 12, Circuit 1205 (BK), harness side and ground; and
between anti- lock brake control module C135 Pin 15, Circuit 397
(BK/WH), harness side and ground.
z Are the resistances less than 5 ohms? Yes
INSTALL a new
anti-
lock brake
control module;
REFER to Module .
REPEAT the self-
test.
No
REPAIR the circuit
in question.
REPEAT the self-
test. Klj . 5 ba
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PINPOINT TEST H: DTC C1233 (LF), C1234 (RF), C1235 (RR), C1236
(LR), ANTI-
LOCK BRAKE SENSOR INPUT SIGNAL MISSING Test Step Result / Action to Take
G1 CHECK THE VEHICLE
COMPONENTS z
Check for correct wheel and tire
size, front- to-rear and side- to-
side.
z Check for excessive bearing
end play.
z Check the anti- lock brake
sensor indicator for a
deformation or missing teeth.
z Are the conditions OK? Yes
GO to
G2 .
No
REPAIR as necessary. CLEAR the DTCs. REPEAT the
self- test. G2 TEST DRIVE THE VEHICLE
z
Enter the following diagnostic
mode on the diagnostic tool:
CLEAR the DTCs.
z Key in OFF position.
z Key in ON position.
z Test drive the vehicle over 24
kph (15 mph).
z Enter the following diagnostic
mode on the diagnostic tool:
Retrieve DTCs.
z Is DTC C1222 retrieved? Yes
INSTALL a new anti-
lock brake control module; REFER
to Module . REPEAT the self-
test.
No
If another DTC is retrieved, GO to the Anti- Lock Brake
Control Module Diagnostic Trouble Code (DTC) index.
If no DTCs are retrieved, the system is OK. Test Step Result / Action to Take
H1 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR z
Check the suspect anti- lock brake sensor
mounting.
z Check the suspect anti- lock brake sensor for
excessive dirt build up, obstructions, and
damage.
z Is the suspect anti- lock brake sensor and
mounting OK? Yes
GO to
H2 .
No
REPAIR as necessary. CLEAR the
DTCs. REPEAT the self-test. H2 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR INDICATOR z
Check the suspect anti- lock brake sensor
indicator for corrosion, nicks, bridged teeth,
damaged teeth, correct mounting, and alignment
with the anti- lock brake sensor.
z Check the air gap and bearing end play.
z Is the suspect anti- lock brake sensor
indicator OK? Yes
GO to
H3 .
No
INSTALL a new anti- lock brake sensor
indicator; REFER to Sensor — Front or
Sensor — Rear . CLEAR the DTCs.
REPEAT the self- test. H3 CHECK THE ANTI-
LOCK BRAKE SENSOR
OUTPUT z
Key in ON position.
z Enter the following diagnostic mode on the
diagnostic tool: CLEAR the DTCs..
z Key in OFF position.
z Key in ON position. Yes
INSTALL a new anti-
lock brake control
module; REFER to Module . REPEAT
the self- test. Klj . 12 ba
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PINPOINT TEST J: THE YELLOW ABS WARNING INDICATOR DOES
NOT SELF-
CHECK
PINPOINT TEST K: SPONGY BRAKE PEDAL WITH NO WARNING
INDICATOR PINPOINT TEST L: POOR VEHICLE TRACKING DURING ANTI - LOCK z
Is the resistance less than 5 ohms? No
REPAIR the circuit. CLEAR
the DTCs. REPEAT the self-
test.
Test Step Result / Action to Take
J1 CHECK THE ABS WARNING INDICATOR CIRCUITRY
z
Key in OFF position.
z Disconnect: Anti- Lock Brake Control Module C135.
z Key in ON position.
z Depress and release the shorting bar connector
internal to the anti- lock brake control module C135,
harness side, while checking the yellow ABS warning
indicator in the instrument cluster.
z Does the yellow ABS indicator illuminate with the
shorting bar released and turn OFF with the
shorting bar depressed? Yes
INSTALL a new anti-
lock brake
control module; REFER to
Module . TEST the system for
normal operation.
No
REFER to Section 413 - 01 .
Test Step Result / Action to Take
K1 CHECK THE VEHICLE COMPONENTS
z
Check the brake pedal and power
booster/brake master cylinder for correct
attachment.
z Are the components OK? Yes
GO to
K2 .
No
REPAIR as necessary. TEST the system for
normal operation. K2 BLEED THE BRAKE SYSTEM
z
Bleed the brake system; Refer to Section 206 - 00 .
z Check for spongy brake pedal.
z Is the brake pedal spongy? Yes
INSTALL a new HCU; REFER to
Hydraulic Control Unit . TEST the system for normal
operation.
No
The brake system is OK. TEST the system
for normal operation. Klj . 14 ba
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FUNCTION
Test Step Result / Action to Take
L1 BLEED THE BRAKE SYSTEM
z
Bleed the brake system. Refer to Section 206 - 00 .
z Check for vehicle tracking poorly.
z Does the vehicle track poorly? Yes
GO to
L2 .
No
The brake system is OK. TEST the
system for normal operation. L2 CHECK THE LF ABS VALVE OPERATION
z
Lift the vehicle and rotate all the wheels to
make sure they rotate freely (the vehicle must
be in neutral).
z NOTE: Trigger must be depressed twice.
Each press will run the pump motor for two
seconds.
z Trigger the anti- lock brake control module
active command PMP MOTOR ON for four
seconds.
z Apply moderate brake pedal effort.
z Have an assistant attempt to rotate the LF
wheel while the pump motor is running.
z Does the LF wheel rotate? Yes
INSTALL a new HCU; REFER to
Hydraulic Control Unit
. TEST the system
for normal operation.
No
GO to L3 .
L3 CHECK THE LF ABS VALVE RELEASE
z
Apply moderate brake pedal effort.
z Trigger the anti- lock brake control module
active command LF INLET and LF OUTLET.
z NOTE: The scan tool will energize the valves
for only two seconds per trigger press.
z Have an assistant rotate the LF wheel
immediately after depressing trigger.
z Does the LF wheel rotate? Yes
GO to
L4 .
No
GO to L8 .
L4 CHECK THE RF ABS VALVE OPERATION
z
NOTE: Trigger must be depressed twice.
Each press will run the pump motor for two
seconds.
z Trigger the anti- lock brake control module
active command PMP MOTOR ON for four
seconds.
z Apply moderate brake pedal effort.
z Have an assistant attempt to rotate the RF
wheel while the pump motor is running.
z Does the RF wheel rotate? Yes
INSTALL a new HCU; REFER to
Hydraulic Control Unit
. TEST the system
for normal operation.
No
GO to L5 .
L5 CHECK THE RF ABS VALVE RELEASE
z
Apply moderate brake pedal effort.
z Trigger the anti- lock brake control module
active command RF INLET and RF OUTLET.
z NOTE: The scan tool will energize the valves
for only two seconds per trigger press.
z Have an assistant rotate the RF wheel
immediately after depressing trigger.
z Does the RF wheel rotate? Yes
GO to
L6 .
No
GO to L8 .
L6 CHECK THE REAR ABS VALVE OPERATION
z
NOTE: Trigger must be depressed
twice.Each press will run the pump motor for Yes
INSTALL a new HCU; REFER to Klj . 15 ba
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two seconds.
z Trigger the anti- lock brake control module
active command PMP MOTOR ON for four
seconds.
z Apply moderate brake pedal effort.
z Have an assistant attempt to rotate the LR
and RR wheels while the pump motor is
running.
z Does the LR or RR wheel rotate? Hydraulic Control Unit . TEST the system
for normal operation.
No
GO to L7 .
L7 CHECK THE REAR ABS VALVE RELEASE
z
Apply moderate brake pedal effort.
z Trigger the anti- lock brake control module
active command R INLET and R OUTLET.
z NOTE: The scan tool will energize the valves
for only two seconds per trigger press.
z Have an assistant rotate the LR and RR
wheels immediately after depressing trigger.
z Does the LR or RR wheel rotate? Yes
The ABS system is operating correctly.
No
GO to
L8 .
L8 CHECK FOR DTCS
z
Carry out the anti- lock brake control module
self- test.
z Are any DTCs retrieved? Yes
GO to the Anti-
Lock Brake Control Module
Diagnostic Trouble Code (DTC) Index.
No
INSTALL a new HCU; REFER to
Hydraulic Control Unit . TEST the system
for normal operation. Klj . 16 ba
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REMOVAL AND INSTALLATION
Hydraulic Control Unit
Removal
1. Disconnect the battery ground cable(14301).
2. Disconnect the anti- lock-brake control module electrical connector.
3. NOTE: The 4 wheel anti- lock brake system (4WABS) with traction control is shown , the
4WABS without traction control system is similar with one less hydraulic line.
NOTE: Plug brake lines to prevent any brake fluid loss.
Disconnect the brake lines from the hydraulic control unit (HCU).
4. Remove the HCU bracket nuts to HCU.
5. Remove the HCU.
SECTION 206-
09A: Anti-Lock Control — Rear 2003 Mustang Workshop Manual Klj . 1 ba
32003 Mustang Workshop Manual
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