Ford 2003 Mustang Workshop Manual page 826

PINPOINT TEST C: NO POWER IN ACC
C1 CHECK THE RADIO FOR NORMAL OPERATION
Key in ON position.
Check the radio for normal operation.
Does the radio operate correctly?
C2 CHECK THE VOLTAGE AT THE IGNITION SWITCH
Disconnect: Ignition Switch C250 .
Measure the voltage between ignition switch C250 Pin B5,
Circuit 1050 (LG/VT), harness side and ground.
Is the voltage greater than 10 volts?
PINPOINT TEST D: NO POWER IN RUN
Test Step
D1 CHECK THE IGNITION SWITCH
Carry out the ignition switch component test.
REFER to Wiring Diagrams Cell 149,
Component Testing.
Is the ignition switch OK ?
PINPOINT TEST E: NO POWER IN START
E1 CHECK THE VOLTAGE TO THE IGNITION SWITCH
Key in OFF position.
Disconnect: Ignition Switch C250 .
Test Step
Test Step
No
INSTALL a new ignition switch. REFER to
Ignition Switch . TEST the system for
normal operation.
Result / Action to Take
Yes
GO to C2
No
Go To Pinpoint Test D
Yes
INSTALL a new ignition
switch. REFER to
Switch . TEST the system for
normal operation.
No
REPAIR the circuit. TEST the
system for normal operation.
Result / Action to Take
Yes
INSTALL a new BJB. TEST the system for
normal operation.
No
INSTALL a new ignition switch. REFER to
Ignition Switch . TEST the system for
normal operation.
Result / Action to Take
Yes
GO to
.
.
Ignition
E2 .