2003 FORD MUSTANG sensor

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
12003 Mustang Workshop Manual
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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
162003 Mustang Workshop Manual
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Anti-Lock Brake Control Module Parameter Identification (PID) Index B1596 Repair Continuous Codes ABS REPAIR the DTCs retrieved.
C1095 ABS Hydraulic Pump Motor
Circuit Failure ABS Go To Pinpoint Test E .
C1145 RF Anti-
Lock Brake Sensor
Input Circuit Failure ABS Go To Pinpoint Test F .
C1155 LF Anti-
Lock Brake Sensor
Input Circuit Failure ABS Go To Pinpoint Test F .
C1165 RR Anti-
Lock Brake Sensor
Input Circuit Failure ABS Go To Pinpoint Test F .
C1175 LR Anti-
Lock Brake Sensor
Input Circuit Failure ABS Go To Pinpoint Test F .
C1222 Anti-
Lock Brake Sensor
Mismatch ABS Go To Pinpoint Test G .
C1233 LF Anti-
Lock Brake Sensor
Input Signal Missing ABS Go To Pinpoint Test H .
C1234 RF Anti-
Lock Brake Sensor
Input Signal Missing ABS Go To Pinpoint Test H .
C1235 RR Anti-
Lock Brake Sensor
Input Signal Missing ABS Go To Pinpoint Test H .
C1236 LR Anti-
Lock Brake Sensor
Input Signal Missing ABS Go To Pinpoint Test H .
C1266 ABS Valve Power Relay
Circuit Failure ABS Go To Pinpoint Test I .
Anti-Lock Brake Control Module Parameter Identification (PID) Index PID Description Expected Value
CCNTABS Number of Continuous DTCS in
the Anti- Lock Brake Control
Module one count per bit
BOO_ABS Brake Switch Input OFF, ON
PMP_MTR ABS Pump Motor OFF---, OFFO--, OFF
-B-, OFF--G, OFFO- G, OFF-
BG, OFFOBG, ON---, ONO--, ON -B-, ON--G, ONO-
G, ON- BG, ONOBG VLV_CTR ABS Valve Control Relay OFF---, OFFO--, OFF
-B-, OFF--G, OFFO- G, OFF-
BG, OFFOBG, ON---, ONO--, ON -B-, ON--G, ONO-
G, ON- BG, ONOBG LF_WSPD LF Wheel Speed 0-
255 MPH RF_WSPD RF Wheel Speed 0-
255 MPH LR_WSPD LR Wheel Speed 0-
255 MPH RR_WSPD RR Wheel Speed 0-
255 MPH ABSLF_I LF ABS Inlet Valve OFF---, OFFO--, OFF
-B-, OFF--G, OFFO- G, OFF-
BG, OFFOBG, ON---, ONO--, ON -B-, ON--G, ONO-
G, ON- BG, ONOBG ABSLF_O LF ABS Outlet Valve OFF---, OFFO--, OFF
-B-, OFF--G, OFFO- G, OFF-
BG, OFFOBG, ON---, ONO--, ON -B-, ON--G, ONO-
G, ON- BG, ONOBG Klj . 3 ba
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PINPOINT TEST F: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175
(LR), ANTI-
LOCK BRAKE SENSOR INPUT CIRCUIT FAILURE z
Does the pump motor operate? the self-
test. Test Step Result / Action to Take
F1 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR CIRCUIT FOR SHORT TO POWER 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 Pins, harness side and
ground as follows:
z Is any voltage present? DTC Anti-Lock Brake Control
Module C135 Pin Circuit
C1145
(RF) 4 514
(YE/RD) C1155
(LF) 20 521
(TN/OG) C1165
(RR) 1 494
(TN/LG) C1175
(LR) 22 496 (OG) Yes
REPAIR the circuit in question.
CLEAR the DTCs. REPEAT the self-
test.
No
GO to
F2 .
F2 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR CIRCUIT FOR SHORT TO GROUND z
Key in OFF position.
z Measure the resistance between anti- lock brake Yes
GO to
F4 . Klj . 9 ba
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control module C135 Pins, harness side and
ground as follows:
z Is the resistance greater than 10,000 ohms? DTC Anti-Lock Brake Control
Module C135 Pin Circuit
C1145
(RF) 4 514
(YE/RD) C1155
(LF) 20 521
(TN/OG) C1165
(RR) 1 494
(TN/LG) C1175
(LR) 22 496 (OG) No
GO to
F3 .
F3 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR FOR A SHORT TO GROUND z
Disconnect: Suspect Anti- Lock Brake Sensor.
z Measure the resistance between suspect anti- lock
brake sensor Pin 1 (component side) and ground.
z Is the resistance greater than 10,000 ohms? Yes
If RF, REPAIR Circuit 514 (YE/RD)
and Circuit 516 (YE/BK), as
necessary. CLEAR the DTCs.
REPEAT the self-
test. If LF, REPAIR
Circuit 521 (TN/OG) and Circuit 522
(TN/BK), as necessary. CLEAR the
DTCs. REPEAT the self-test. If RR,
REPAIR Circuit 494 (TN/LG) and
Circuit 492 (BN), as necessary.
CLEAR the DTCs. REPEAT the self-
test. If LR, REPAIR Circuit 496 (OG)
and Circuit 499 (GY/BK), as
necessary. CLEAR the DTCs.
REPEAT the self- test.
No
INSTALL a new anti- lock brake
sensor; REFER to Sensor — Front or
Sensor — Rear . CLEAR the DTCs.
REPEAT the self- test. F4 CHECK THE SUSPECT ANTI-
LOCK BRAKE
SENSOR CIRCUIT FOR FOR AN OPEN z
Key in OFF position.
z Measure the resistance between anti- lock brake
control module C135 pins, harness side and
suspect anti- lock brake sensor, harness side as
follows: Yes
GO to
F5 .
No
REPAIR the circuit in question.
CLEAR the DTCs. REPEAT the self- Klj . 10 ba
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PINPOINT TEST G: DTC C1222, ANTI-
LOCK BRAKE SENSOR MISMATCH z
Are the resistances less than 5 ohms? DTC Anti-Lock
Brake Control Module Anti-Lock
Brake
Sensor Circuit
C1145
(RF) C135 Pin 4 C160 Pin 1 514
(YE/RD) C1145
(RF) C135 Pin 5 C160 Pin 2 516
(YE/BK) C1155
(LF) C135 Pin 20 C150 Pin 1 521
(TN/OG) C1155
(LF) C135 Pin 21 C150 Pin 2 522
(TN/BK) C1165
(RR) C135 Pin 1 C3117 Pin 2 494
(TN/LG) C1165
(RR) C135 Pin 3 C3117 Pin 1 492 (BN)
C1175
(LR) C135 Pin 22 C3116 Pin 2 496 (OG)
C1175
(LR) C135 Pin 23 C3116 Pin 1 499
(GY/BK) test.
F5 CHECK THE ANTI-
LOCK BRAKE SENSOR z
Measure the resistance between suspect anti- lock
brake sensor Pin 1 (component side) and suspect
anti- lock brake sensor Pin 2 (component side).
z Is the resistance between 1280 and 1920 (front)
or 1830 and 2760 (rear) ohms? Yes
INSTALL a new anti-
lock brake
control module; REFER to Module .
REPEAT the self- test.
No
INSTALL a new anti- lock brake
sensor; REFER to Sensor — Front or
Sensor — Rear . CLEAR the DTCs.
REPEAT the self- test. Klj . 11 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
162003 Mustang Workshop Manual
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