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:

Arm - Lower
Wheel Studs Removal 1. Remove the wheel hub (1104). For additional information, refer to Wheel Hub and Bearing in this section. 2. Using a press, remove the wheel stud (1107) from the wheel hub. Installation 1. Using a press, install a new wheel stud. 2. I ...

Disc and Pressure Plate - 3.8L and 4.6L (2V) Engines
Clutch (Description and Operation) The primary function of the clutch is to couple and uncouple engine power to the transmission upon driver command. The clutch is a single plate, dry friction clutch disc. The clutch disc has a splined hub (with ...

Generator and Regulator
General Specifications Torque Specifications Generator The charging system consists of the: generator (GEN) internal voltage regulator The generator has an internal voltage regulator that is not installed separately. The generator and v ...