Ford 2003 Mustang Workshop Manual page 694

K8 CHECK THE RR ABS VALVE OPERATION
NOTE: Trigger must be depressed twice.
Each depress runs the pump motor for two
seconds.
Trigger the anti-lock brake control module
active command PMP MOTOR ON for four
seconds.
Apply moderate brake pedal effort.
Have an assistant attempt to rotate the RR
wheel while the pump motor is running.
Does the RR wheel rotate?
K9 CHECK THE RR ABS VALVE RELEASE
Apply moderate brake pedal effort.
Trigger the anti-lock brake control module
active command RF INLET and RF OUTLET.
NOTE: The scan tool will energize the valves
for only two seconds per trigger press.
Have an assistant rotate the RR wheel
immediately after depressing trigger.
Does the RR wheel rotate?
K10 CHECK FOR DTCS
Carry out the anti-lock brake control module
self-test.
Are any DTCs retrieved?
PINPOINT TEST L: THE TRACTION CONTROL IS INOPERATIVE—
DOES NOT OPERATE CORRECTLY
L1 CHECK THE TRACTION CONTROL SWITCH CIRCUITRY
Key in OFF position.
Disconnect: Instrument Cluster C251.
Key in ON position.
Measure the voltage between instrument cluster C251 Pin 9,
Circuit 959 (GY), harness side and ground, while depressing
and releasing the traction control switch.
Is the voltage greater than 10 volts with the traction control
switch depressed and zero volts with the traction control
switch released?
Test Step
Yes
INSTALL a new HCU; REFER to
Hydraulic Control Unit . TEST the system
for normal operation.
No
GO to K9 .
Yes
The ABS system is operating correctly.
No
GO to K10 .
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.
Result / Action to Take
Yes
INSTALL a new
instrument cluster,
REFER to
01 . TEST the system
for normal operation.
No
GO to
Section 413-
L2 .