Ford 2003 Mustang Workshop Manual page 652

PINPOINT TEST B: UNABLE TO ENTER SELF-TEST
Test Step
B1 CHECK THE COMMUNICATIONS TO THE
ANTI-LOCK BRAKE CONTROL MODULE
Check the communications to the anti-lock
brake control module.
Does the scan tool communicate with the
anti-lock brake control module?
PINPOINT TEST C: DTC B1318, BATTERY VOLTAGE LOW
C1 CHECK BATTERY VOLTAGE
Measure the battery voltage between the positive and negative
battery posts with the key ON engine OFF (KOEO), and with the
engine running.
Is the battery voltage between 10 and 13 volts with KOEO, and
between 11 and 17 volts with the engine running?
C2 CHECK THE VOLTAGE TO THE ANTI-LOCK BRAKE CONTROL
MODULE
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?
C3 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE GROUNDS
Yes
INSTALL a new anti-lock brake control
module; REFER to
self-test.
No
Go To Pinpoint Test A
Test Step
Result / Action to Take
Module . REPEAT the
.
Result / Action to
Take
Yes
GO to C2
No
REFER to
414-00 .
Yes
GO to C3
No
REPAIR the circuit.
CLEAR the DTCs.
REPEAT the self-
test.
.
Section
.