Pinpoint Tests
The red BRAKE warning
indicator is always/never on
Wiring, terminals or
connectors
Parking brake switch
Brake fluid level switch (part
of the master cylinder)
Brake fluid level
Instrument cluster
REFER to
Section 413-01
to continue diagnosis of the warning indicator.
The stability/traction control
indicator (in the instrument
cluster) is always/never on
DTCs present in the ABS
module or PCM
PCM
Instrument cluster
RETRIEVE and RECORD any ABS module DTCs. GO to the ABS Module DTC
Chart. If there are no DTCs present in the ABS module, RETRIEVE and RECORD
any PCM DTCs. REFER to the Powertrain Control/Emissions Diagnosis (PC/ED)
manual. If there are no PCM DTCs, REFER to Diagnosis and Testing in
Section
413-01
.
The stability/traction control
OFF indicator (in the switch) is
always/never on
Wiring, terminals or
connectors
Stability/traction control
switch
PCM
GO to Pinpoint Test Q
.
The stability/traction control
indicator (in the instrument
cluster) is flashing at all times
NOTE: It is normal for the
indicator to flash during a
traction control event.
ABS module not configured
or system not initialized
RETRIEVE and RECORD all ABS module DTCs and GO to the ABS Module DTC
Chart.
No communication with the ABS
module
Wiring, terminals or
connectors
ABS module
REFER to
Section 418-00
to diagnose the no communication concern.
The stability/traction control
system cannot be
disabled/enabled
Fuse
Wiring, terminals or
connectors
Stability/traction control
switch
PCM
GO to Pinpoint Test P
.
The stability/traction control
system is inoperative
Stability/traction control
system is turned off
Stability/traction control
system is not configured
Fuse
Wiring, terminals or
connectors
ABS wheel speed sensor
fault
High-speed controller area
network (HS-CAN) bus fault
PCM
GO to Pinpoint Test P
.
ABS false activation, ABS too
sensitive, ABS activates on a
normal stop
Brake pads
Brake calipers and/or guide
pins
ELIMINATE the base brake system as the cause of the problem. REFER to
Diagnosis and Testing in
Section 206-00
.
Parking brake shoes out of
adjustment (dragging)
CHECK and if necessary, ADJUST the parking brake shoes. REFER to
Section
206-05
.
Wheel speed sensor tone
rings
INSPECT the wheel speed sensor tone rings for damaged teeth and excessive air
gap. INSTALL new wheel speed sensor rings as necessary. For front tone rings,
REFER to
Wheel Speed Sensor Ring — Front
in this section. For rear tone rings,
REFER to Wheel Hub Removal and Installation in
Section 205-02B
.
Wheel speed sensor
GO to Pinpoint Test J
.
Chafed wheel speed sensor
wire insulation or pinched
wheel speed sensor wire
INSPECT the wiring harness from the wheel speed sensor knuckle to the frame
and from the rear axle to the frame. REPAIR as necessary.
Open or shorted wheel
speed sensor circuit
GO to Pinpoint Test I
.
Vehicle pulls during braking
Brake pads
Brake discs
Brake calipers and/or guide
pins
Wheel speed sensor
DISCONNECT the ABS module electrical connector. DRIVE the vehicle and
VERIFY the condition. If the condition is still present, REFER to
Section 206-00
to
diagnose the base braking system. If the condition is no longer present,
GO to
Pinpoint Test J
.
Wheels lock up
Brake pads
Brake calipers and/or guide
pins
ELIMINATE the base brake system as the cause of the problem. REFER to
Diagnosis and Testing in
Section 206-00
.
Parking brake shoes out of
adjustment (dragging)
CHECK and if necessary, ADJUST the parking brake shoes. REFER to
Section
206-05
.
Hydraulic outlet (dump)
valve
Leaky inlet (isolation) valve
during ABS (soft)
BLEED the HCU. REFER to Brake System Bleeding in
Section 206-00
. TEST the
system for normal operation. If the symptom returns, INSTALL a new HCU. REFER
to
Hydraulic Control Unit (HCU)
in this section. Using the scan tool, CARRY OUT
the IVD Initialization sequence. TEST the system for normal operation.
Soft/excessive brake pedal
travel
Air in brake system
Brake calipers and/or guide
pins
Brake flexible hose
Brake master cylinder
Brake pads
Brake pedal
ELIMINATE the base brake system as the cause of the problem. REFER to
Diagnosis and Testing in
Section 206-00
.
Inlet (isolation) valve or
hydraulic outlet (dump)
valve
Leaky inlet (isolation) valve
during ABS applications
(soft)
BLEED the hydraulic control unit (HCU). REFER to Brake System Bleeding in
Section 206-00
. TEST the system for normal operation. If the symptom returns,
INSTALL a new HCU. REFER to
Hydraulic Control Unit (HCU)
in this section.
Using the scan tool, CARRY OUT the IVD Initialization sequence. TEST the system
for normal operation.
Page 6 of 6
2008 E-Series Workshop Manual
1/18/2010
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS8M/~MUS~LEN/19/...
