303-06A Starting System - 1.6L Duratec-16V Ti-VCT (88kW/120PS) - Sigma	2014 Fiesta
Description and Operation	Procedure revision date: 04/25/2013

Starting System - Vehicles Without: Keyless Entry and Push Button Start - System Operation and Component Description

System Diagram

System Operation

Network Message Chart

Module Network Input Messages Powertrain Control Module (PCM)

Broadcast Message	Originating Module	Message Purpose
Selector lever (PRNDL) status	TCM	Provides the PCM with the selector lever status. The PCM only energizes the starter relay if the selector lever is in PARK or NEUTRAL.
Crank request	BCM	Provides the PCM with indication that the driver has commanded the engine to crank.
Power mode	BCM	Provides the PCM with ignition mode.

Starting System

This vehicle is equipped with a PATS that disables the engine from cranking and starting if an unprogrammed PATS key is used or an invalid PCM ID is received. The PATS is controlled by the BCM . If there is a PATS concern that causes the engine to be disabled, the IPC displays the corresponding message in the message center.
Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01B Passive Anti-Theft System (PATS) - Vehicles Without: Keyless Entry and Push Button Start, Description and Operation).

Under normal operation, when the ignition is turned to START, the PCM receives the inputs:

Voltage signal on the crank detect circuit from the ignition switch.
PATS enable message from the BCM .
Correct transmission park or neutral input from the TCM (automatic transmission).
Correct bottom of travel input from the CPP switch (manual transmission).

When the PCM receives the correct inputs, voltage and ground is supplied to the starter relay coil. When the starter relay coil is energized, it provides voltage to the starter solenoid, allowing the starter motor to crank and start the engine.

The PCM disengages the starter once an engine Revolutions Per Minute (RPM) threshold is reached, a set crank time is exceeded or the ignition is turned OFF.

Component Description

Integrated Keyhead Transmitter (IKT)

For more information,
Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01B Passive Anti-Theft System (PATS) - Vehicles Without: Keyless Entry and Push Button Start, Description and Operation).

Passive Anti-Theft Transceiver

Ignition Switch

The ignition switch provides the PCM with a request to crank the engine. For more information,
Refer to: Steering Wheel and Column Electrical Components - System Operation and Component Description (211-05 Steering Column Switches, Description and Operation).

Powertrain Control Module (PCM)

The PCM provides power and ground to the starter relay to initiate cranking of the engine.