Ford Mustang Service Manual: Starting System (Diagnosis and Testing)

Starting System (Description and Operation)

Starter Motor

The starter motor is a 12-volt unit that has the starter solenoid mounted on the drive end housing and functions as follows:

  • The current flows through the solenoid energizing coil until the solenoid plunger is at the end of its travel.
  • The plunger closes a set of contacts that bypass the energizing coil, letting the holding coil keep the starter drive engaged and passing starting current to the starter motor.
  • The motor is energized when the starter solenoid contacts are closed.
  • The starter drive engages the flywheel ring gear and starts the engine.
  • An overrunning clutch in the starter drive protects the starter motor from excessive speed when the engine starts.

Starter Relay

The starter interrupt relay consists of:

  • pull in coil and contacts
  • When the ignition switch is in the START position:
  • the pull-in coil is activated and pulls the contacts together.
  • current passes through the starter relay from the engine compartment power distribution box to the starter solenoid.

Clutch Pedal Position (CPP) Switch

The CPP switch for:

  • a manual transmission closes when the clutch pedal is depressed, completing the starting circuit.
  • an automatic transmission is a jumper inserted in place of the CPP switch to complete the circuit.

Starter System - Operation

When the ignition switch is turned to the START position the starter relay switches power to the starter solenoid causing the starter motor to engage as long as:

  • the clutch pedal is depressed (manual transmission only).
  • the digital transmission range (TR) sensor is in PARK or NEUTRAL (automatic transmission only).
Starting System (Description and Operation)
Starting System (Description and Operation) Starter Motor The starter motor is a 12-volt unit that has the starter solenoid mounted on the drive end housing and functions as follows: The current fl ...

Inspection and Verification
Inspection and Verification 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 s ...

Other materials:

Oil Filter Adapter
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Output Shaft and Direct Clutch Cylinder
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Inspection and Verification
Inspection and Verification 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 protec ...