Ford 2003 Mustang Workshop Manual page 651

warning indicator
Poor vehicle tracking during
anti-lock function
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 C135.
Key in ON position.
Measure the voltage between anti-lock brake control module C135
Pin 8, Circuit 601 (LB/PK), harness side and ground.
Is the voltage greater than 10 volts?
A2 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE GROUNDS
Measure the resistance between anti-lock brake control module
C135 Pin 12, Circuit 1205 (BK), harness side and ground; and
between anti-lock brake control module C135 Pin 15, Circuit 397
(BK/WH), harness side and ground.
Are the resistances less than 5 ohms?
system.
Base brake
system.
Air in the brake
system.
Hydraulic control
unit (HCU).
Base brake
system.
Test Step
Test K .
REFER to
Section 206-
00 .
Go To Pinpoint
Test L .
REFER to
Section 206-
00 .
Result / Action to
Take
Yes
GO to A2 .
No
REPAIR the circuit.
REPEAT the self-
test.
Yes
INSTALL a new
anti-lock brake
control module;
REFER to Module .
REPEAT the self-
test.
No
REPAIR the circuit
in question.
REPEAT the self-
test.