Ford 2003 Mustang Workshop Manual page 683

test.
Condition
No communication with the anti-
lock brake control module
Unable to enter self-test
The yellow ABS warning indicator
does not self-check
Spongy brake pedal with no
warning indicator
Poor vehicle tracking during anti-
lock function
The traction control is
inoperative—does not operate
correctly
The traction control indicator is
inoperative—traction control
switch
Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-LOCK
BRAKE CONTROL MODULE
A1 CHECK CIRCUIT 601 (LB/PK) FOR AN OPEN
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Measure the voltage between anti-lock brake control module C141
Pin 8, Circuit 601 (LB/PK), harness side and ground.
Possible Sources
CJB Fuse 29
(15A).
Circuitry.
Anti-lock brake
control module.
Anti-lock brake
control module.
Circuitry.
Anti-lock brake
control module.
Instrument
cluster.
Air in the brake
system.
Base brake
system.
Hydraulic control
unit (HCU).
Air in the brake
system.
Hydraulic control
unit (HCU).
Base brake
system.
CJB 5 (15A).
Circuitry.
Traction control
switch.
Instrument
cluster.
Anti-lock brake
control module.
Circuitry.
Traction control
switch.
Instrument
cluster.
Test Step
Action
Go To Pinpoint
Test A .
Go To Pinpoint
Test B .
Go To Pinpoint
Test I .
Go To Pinpoint
Test J .
REFER to
Section 206-
00 .
Go To Pinpoint
Test K .
REFER to
Section 206-
00 .
Go To Pinpoint
Test L .
Go To Pinpoint
Test M .
Result / Action to
Take
Yes
GO to A2 .
No
REPAIR the circuit.