Starting System - 2.0L Ecoboost: Other Ford Focus III

Starting System - with Push Button Start

The starting system controls the cranking of the engine. The starter motor is enabled by the starter relay when the relay is activated by the PCM. The PCM receives inputs from the ignition switch - push button start, BCM and CPP switch before activating the starter relay to initiate cranking of the engine.

Scheme 19

Network Message Chart

MODULE NETWORK INPUT MESSAGES POWERTRAIN CONTROL MODULE (PCM)

MODULE NETWORK INPUT MESSAGES BODY CONTROL MODULE (BCM)

This vehicle is equipped with a PATS that disables the engine from cranking 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. For additional information

Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description ( PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION ).

Ignition modes are controlled by the RFA module and the BCM. For additional information on the ignition switch - push button start modes

Refer to: Steering Wheel and Column Electrical Components - System Operation and Component Description ( STEERING WHEEL AND COLUMN ELECTRICAL COMPONENTS - SYSTEM OPERATION AND COMPONENT DESCRIPTION ).

The ignition switch - push button start is connected to the RFA module and the BCM as a backup in case of a failure. If there is a circuit failure to either module from the ignition switch - push button start, the modules communicate the ignition switch - push button start request to each other over the Medium Speed Controller Area Network (MS-CAN).

During a start event, the ignition switch - push button start is pressed in combination with the clutch pedal. The RFA module, the BCM and the PCM receive a request to start the engine. The PCM recognizes the correct inputs and provides voltage and ground to energize the starter relay coil and close the starter relay contacts. The starter relay contacts close, providing voltage to the starter solenoid, allowing the starter motor to crank the engine. The PCM disengages the starter motor once an engine Revolutions Per Minute (RPM) threshold is reached, a set crank time is exceeded or the ignition switch - push button start is pressed indicating an engine shutdown.

Body Control Module (BCM)

Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description ( PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION ).

Intelligent Access (IA) Key

Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description ( PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION .

Ignition Switch - Push Button Start

The ignition switch - push button start is a momentary contact switch that is hardwired to the BCM, PCM and RFA module. The ignition switch - push button start is used to obtain the OFF, ON or START ignition modes.

Remote Function Actuator (RFA) Module

Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description ( PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION ).

Powertrain Control Module (PCM)

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

Engine Does Not Crank

Refer to OEM WIRING DIAGRAMS for schematic and connector information.

Possible Sources

1. Battery
2. Battery cables
3. Starter motor
4. BJB starter relay
5. CPP switch

1. Engine
2. Starter motor
3. Starter motor mounting

1. Wiring, terminals or connectors
2. PCM

1. Ignition switch - push button start
2. Wiring, terminals or connectors
3. PCM

B10E5:11 or B10E5:15

Refer to ELECTRONIC ENGINE CONTROLS for schematic and connector information.

1. BCM
2. PCM
3. Wiring, terminals or connectors