Ford F150 Pickup. Manual — part 362

the key to spring back from the START position to the RUN position. The Yellow ABS warning indicator
should prove-out by illuminating for approximately 1-2 seconds and then turning off.

If the ABS indicator light remains on after prove-out, the module has detected a currently existing fault and has
stored a DTC in memory. This is referred to as a hard fault. A soft fault is one that occurred, caused the
indicator to come on and then went away. These are an intermittent type of fault and will not cause a DTC to be
stored in the module's memory. Continue to Diagnostic Trouble Codes, Retrieving for obtaining diagnostic
trouble codes. If the Yellow ABS warning indicator fails to illuminate, go to the SYMPTOM CHART .

Diagnostic Trouble Codes (DTCs), Retrieving

Verify the ignition switch is in the RUN position (engine does not need to be running). Next, locate the black
RABS diagnostic connector C207. The diagnostic connector C207 has two mating halves, one of which has a
Black/Orange (BK/OG) wire connected to it. Disconnect the two halves.

Attach one end of a jumper wire to the Black/Orange (BK/OG) wire side of the diagnostic connector C207.
Ground the opposite end of the jumper wire by connecting it to a ground until the ABS light begins to flash.
Grounding this wire should start the Yellow ABS warning indicator flashing. If grounding this wire does not
start the Yellow ABS warning indicator flashing, go to the SYMPTOM CHART .

The code consists of a number of short flashes and ends with a long flash. Count the short flashes and include
the following long flash in the count to obtain the code number. For example, three short flashes followed by
one long flash indicates diagnostic trouble code 4. The code will continue to repeat itself until the key is turned
off. It is recommended that the code be verified by reading it several times. This code will be used later for
system repair manuals. It should be written down for future use. A diagnostic trouble code 16 is obtained
when the anti-lock brake control module detects normal system operation.

Diagnostic Trouble Codes (DTCs), Erasing

The last step of the system pre-check always includes clearing the Keep Alive Memory (KAM). Turn off the
ignition while the diagnostic connector C207 halves are separated as described in Diagnostic Trouble Codes,
Retrieving. The diagnostic connector C207 should be re-assembled to provide KAM power to the anti-lock
brake control module.

If a valid code has been obtained, go to the SYMPTOM CHART .

Symptom Chart

CAUTION: Care must be taken to connect only the black/orange stripe wire to

ground. Connecting the mating connector wire to ground will result in a
blown fuse.

NOTE:

Code 16 is always present, unless a system concern has been detected and a
DTC has been stored. This code should be used by the technician to verify that
the RAB system is OK. Code 16 will be output by the RABS module when the
technician grounds circuit 571 (BK/OG), or the RABS keep-alive memory fuse
(CJB Fuse 15 [5A]) has blown.

2003 Ford Pickup F150

2003 BRAKES Anti-Lock Control-Rear - F150 Pickup

There are times when a customer concern will not cause the Yellow ABS warning indicator to illuminate or a
code to be stored.

The Symptom Chart gives the technician a starting point in resolving these types of concerns. The chart also
describes conditions that will illuminate the Yellow ABS warning indicator.

SYMPTOM CHART

NOTE:

Both the Red BRAKE warning indicator diagnosis procedure and test drive are
required prior to performing the tests in this section. Failure to carry out these
procedures will greatly diminish the effectiveness of the diagnosis.

NOTE:

Refer to the Wiring Diagrams for connector numbers stated in the Pinpoint
Tests.

Condition

Possible Sources

Action

z

The red BRAKE
warning indicator is
always off

z

Circuitry.

z

Red BRAKE warning
indicator bulb.

z

Instrument cluster.

z

REFER to INSTRUMENT
CLUSTER-CONVENTIONAL -
F150 , INSTRUMENT
CLUSTER-BI-FUEL - F150 or
INSTRUMENT CLUSTER-
NATURAL GAS - F150 .

z

The red BRAKE
warning indicator is
always on

z

Parking brake switch.

z

Master cylinder fluid level
switch.

z

Circuitry.

z

Daytime running lamp
(DRL) (if equipped).

z

REFER to DISC - BLACKWOOD,
F150 HERITAGE PICKUP &
F150 .

z

The yellow ABS
warning indicator is
always off

z

Circuitry.

z

Yellow ABS warning
indicator bulb.

z

Instrument cluster.

z

REFER to INSTRUMENT
CLUSTER-CONVENTIONAL -
F150 , INSTRUMENT
CLUSTER-BI-FUEL - F150 or
INSTRUMENT CLUSTER-
NATURAL GAS - F150 .

z

The yellow ABS
warning indicator is
always on

z

Circuitry.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST A:
YELLOW ABS WARNING
INDICATOR IS ALWAYS ON .

z

The yellow ABS
warning indicator
self-checks OK but
automatically begins
flashing

z

Circuitry.

z

Fuse junction panel Fuse
15 (5A).

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST B:
YELLOW ABS WARNING
INDICATOR SELF-CHECKS
OK BUT AUTOMATICALLY
BEGINS FLASHING .

z

The yellow ABS

z

Fuse.

z

Go To PINPOINT TEST C:

2003 Ford Pickup F150

2003 BRAKES Anti-Lock Control-Rear - F150 Pickup

warning indicator
self-checks OK but
no diagnostic
trouble codes are
retrieved when
diagnostics are
started

z

Stoplamps.

z

Circuitry.

z

Anti-lock brake control
module.

YELLOW ABS WARNING
INDICATOR SELF-CHECKS
OK BUT NO DIAGNOSTIC
TROUBLE CODES (DTCS) ARE
RETRIEVED WHEN
DIAGNOSTICS ARE STARTED .

z

DTC 2-open RABS
isolation solenoid
circuit

z

Bulkhead connector
(between engine
compartment and
instrument panel).

z

Anti-lock brake control
module or RABS valve
connectors not fully
seated with component.

z

Circuitry.

z

RABS valve.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST D:
DIAGNOSTIC TROUBLE CODE
(DTC) 2 - OPEN RABS
ISOLATION SOLENOID
CIRCUIT .

z

DTC 3-open RABS
dump solenoid
circuit

z

Bulkhead connector
(between engine
compartment and
instrument panel).

z

Anti-lock brake control
module or RABS valve
connectors not fully
seated with component.

z

Circuitry.

z

RABS valve.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST E:
DIAGNOSTIC TROUBLE CODE
(DTC) 3 - OPEN RABS DUMP
SOLENOID CIRCUIT .

z

DTC 4-
open/grounded
RABS valve reset
circuit

z

Bulkhead connector
(between engine
compartment and
instrument panel).

z

Anti-lock brake control
module or RABS valve
connectors not fully
seated with component.

z

Circuitry.

z

RABS valve.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST F:
DIAGNOSTIC TROUBLE CODE
(DTC) 4 - GROUNDED/OPEN
RABS VALVE RESET SWITCH
CIRCUIT .

2003 Ford Pickup F150

2003 BRAKES Anti-Lock Control-Rear - F150 Pickup

z

DTC 5-excessive
dump solenoid
activity

z

Parking brake.

z

4WD indicator switch
(4x4 vehicles only).

z

Rear brake assembly.

z

Circuitry.

z

Wire insulation to battery
power (4x4 vehicles
only).

z

Go To PINPOINT TEST G:
DIAGNOSTIC TROUBLE CODE
(DTC) 5 - EXCESSIVE DUMP
SOLENOID ACTIVITY .

z

DTC 6-erratic rear
anti-lock brake
sensor circuit

z

Bulkhead connector
(between engine
compartment and
instrument panel).

z

Anti-lock brake control
module or rear anti-lock
brake sensor connectors
not fully seated with
component.

z

Circuitry.

z

Rear anti-lock brake
sensor.

z

Rear anti-lock brake
sensor indicator.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST H:
DIAGNOSTIC TROUBLE CODE
(DTC) 6 - ERRATIC REAR
ANTI-LOCK BRAKE SENSOR
CIRCUIT .

z

DTC 7-no isolation
solenoid during
selfcheck

z

Circuitry.

z

RABS valve.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST I:
DIAGNOSTIC TROUBLE CODE
(DTC) 7 - NO ISOLATION
SOLENOID DURING SELF-
CHECK .

z

DTC 8-no dump
solenoid during
selfcheck

z

Circuitry.

z

Bulkhead connector
between engine
compartment and
instrument panel terminals
shorted.

z

RABS valve.

z

Anti-lock brake control
module.

z

Go To PINPOINT TEST J:
DIAGNOSTIC TROUBLE CODE
(DTC) 8 - NO DUMP SOLENOID
DURING SELF-CHECK .

z

DTC 9-speed sensor
high resistance/open
circuit

z

Anti-lock brake control
module or rear anti-lock
brake sensor connectors
not fully seated with

z

Go To PINPOINT TEST K:
DIAGNOSTIC TROUBLE CODE
(DTC) 9 - SPEED SENSOR HIGH
RESISTANCE/OPEN CIRCUIT .

2003 Ford Pickup F150

2003 BRAKES Anti-Lock Control-Rear - F150 Pickup