2003 FORD MUSTANG Workshop Manual

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Page 2041 of 4378

FORD MUSTANG 2003 Workshop Manual 12, circuit 33 (WH/PK) and the starter motor relay pin 86, circuit
33 (WH/PK).
�z Is the resistance less than 5 ohms? B4 CHECK DIGITAL TRANSMISSION RANGE (TR) SENSOR
ADJUSTMENT �z
Carry out the d

Page 2042 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Measure the voltage between the central junction box fuse 6,
circuit 33 (WH/PK) and ground while holding the key in the
START position.
�z Is the voltage greater than 10 volts? system for norma

Page 2043 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST C: THE ENGINE CRANKS SLOWLY
PINPOINT TEST D: UNUSUAL STARTER NOISE �z
Measure the resistance between the starter motor relay pin 86,
circuit 1205 (BK) and ground.
�z Is the resistanc

Page 2044 of 4378

FORD MUSTANG 2003 Workshop Manual Component Tests
Starter Motor —Voltage Drop Test
WARNING: When servicing starter motor or carrying out other underhood work in the
vicinity of the starter motor, be aware that the heavy gauge ba

Component Tests
Starter Motor —Voltage Drop Test
WARNING: When servicing starter motor or carrying out other underhood work in the
vicinity of the starter motor, be aware that the heavy gauge battery input lead at the starter
solenoid is "electrically hot" at all times. A protective cap or boot is provided over this terminal
that must be installed after servicing. Be sure to disconnect the battery negative cable before
servicing the starter. Failure to follow these instructions may result in personal injury.
WARNING: When using a remote starter switch or jumper wire, be sure the ignition switch
is in the OFF position and the transmission is in PARK (A/T) or Neutral (M/T) with the parking
brake control fully applied.
Always make the Digital Multimeter connections at the component terminal rather than at the wiring
end connector. Making a connection at the wiring end connector could result in false readings because
the meter will not pick up a high resistance between the wiring connector and the component.
Starter Motor— Motor Feed Circuit
1. Make sure the battery is fully charged. Perform a battery load test. For additional information, refer to Section 414 - 00 .
2. Disconnect the inertia fuel shut off (IFS) switch.
3. Connect a remote starter switch between the starter solenoid S- terminal and the battery positive
(+) terminal.
4. Connect the Digital Multimeter positive lead to the battery positive (+) post. Connect negative lead to the starter solenoid M- terminal. brackets for cracks.
z Check the starter motor mounting
bolts for looseness.
z Is the starter motor mounted
correctly? GO to
D2 .
No
REINSTALL the starter motor correctly. REFER to
Starter Motor — 3.8L or
Starter Motor — 4.6L in this
section. D2 INSPECT THE STARTER MOTOR
z
Remove the starter motor; refer to
Starter Motor — 3.8L or
Starter Motor — 4.6L in this section.
z Inspect the starter motor for
damage.
z Is the starter motor damaged? Yes
INSTALL a new starter motor. REFER to
Starter Motor — 3.8L or
Starter Motor — 4.6L in this section.
TEST the system for normal operation.
No
CHECK the starter drive. REFER to Component
Tests, Starter Drive Test in this section. INSTALL a
new starter motor. TEST the system for normal
operation. Klj . 8 ba
112003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Page 2045 of 4378

FORD MUSTANG 2003 Workshop Manual 5. Engage the remote starter switch. Read and record the voltage. The voltage reading should be
0.5 volt or less.
6. If the voltage reading is less than 0.5 volts, go to the Starter Motor- Ground Ci

Page 2046 of 4378

FORD MUSTANG 2003 Workshop Manual reading is still greater than 0.5 volts when checked at the M-
terminal and less than 0.5 volts
when checked at the B- terminal, the concern is in the solenoid contacts. Install a new starter
motor.

Page 2047 of 4378

FORD MUSTANG 2003 Workshop Manual Klj . 11 ba
112003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Page 2048 of 4378

FORD MUSTANG 2003 Workshop Manual GENERAL PROCEDURES
Starter Drive and Flywheel Ring Gear Inspection
1. Remove the starter motor. For additional information, refer to Starter Motor — 3.8L or
Starter Motor — 4.6L in this sec

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