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Automotive Vehicle Strategies and ECM Modes

Diagnostic Strategies of Modern Automotive Systems

By Mandy Concepcion

This book is divided into two sections, “Vehicle Operational Strategies”,
which detail what’s needed for and engine to start. In other words, this
section concentrates on the signals needed for a particular manufacturer to
make the engine run. These signal strategies are true regardless of the system
and the section simply zeros in on the actual signal, whether it’s a
distributor, DIS, COP, etc.

The second section is the ECM operational modes and goes into details on why
and how the ECM does what it needs to do to run the engine. In other words,
this section has to do with the behavior of the ECM according to outside
conditions.

VEHICLE OPERATIONAL STRATEGIES

This section is designed to serve as a functional guide to some of the more
difficult to diagnose faults. It basically came about from the trial and error
experimentation with different systems, during the diagnostic process. It is
not a study section per se, but will definitely enlighten the technician as to
the logics of different systems on the market today. Hopefully, it will serve
to pinpoint the source of an actual problem.

ECM OPERATIONAL MODES

In this section, we’ll take a look at automotive OPERATIONAL MODES. The
section deals with the specifics of internal ECM programming strategies. The
knowledge gained here will aide the modern technician is deciphering why is
the ECM functioning in a specific way. This section, as in other parts of this
book, helps to answer the technician’s diagnostic basic question “What is the
ECM seeing, that’s causing it to do what it does?”

Table of Contents

VEHICLE OPERATIONAL STRATEGIES

- HONDA IGNITION & INJECTION STRATEGY
- MAZDA IGNITION STRATEGY
- MAZDA EEC IV IGNITION STRATEGY
- MITSUBISHI/HYUNDAI IGNITION STRATEGY
- NISSAN IGNITION STRATEGY
- NISSAN COP IGNITION STRATEGY
- TOYOTA IGNITION STRATEGY

ECM OPERATIONAL MODES

• CRANKING ENRICHMENT MODE

• ENGINE WARM-UP MODE

• OPEN-LOOP MODE

• CLOSE-LOOP MODE

• ACCELERATION ENRICHMENT MODE

• DECELERATION ENLEANMENT MODE

• IDLE SPEED CONTROL MODE

• LOW VOLTAGE CORRECTION MODE

• CLEAR FLOOD MODE

• SELECTIVE FUEL INJECTOR CUT-OFF MODE

• LIMP-HOME MODE

• EXHAUST VARIABLE VALVE TIMING/EGR CONTROL MODE

About the author:

Mandy Concepcion has worked in the automotive field for over 21 years. He
holds a Degree in Applied Electronics Engineering as well as an ASE Master &
L1 certification. For the past 16 years he has been exclusively involved in
the diagnosis of all the different electronic systems found in today's
vehicles. It is here where he draws extensive practical knowledge from his
experience and hopes to convey it in his books. Mandy also designs and builds
his own diagnostic equipment, DVD-Videos and repair software.

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Feb. 15, 2013, 4:10 a.m.

Vehicle Strategies & ECM Modes

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