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  • 00:06

    BMW DME Injector Cutoff Circuit Strategy
    BMW DME Injector Cutoff Circuit Strategy

  • 00:11

    BMW has used the injector cutoff strategy in various forms for many years now.
    BMW has used the injector cutoff strategy in various forms for many years now.

  • 00:17

    The importance of this is that a technician may approach an engine with non pulsing injectors
    The importance of this is that a technician may approach an engine with non pulsing injectors

  • 00:22

    and make it seems as if the DME itself is defective, then the issue is not the DME,
    and make it seems as if the DME itself is defective, then the issue is not the DME,

  • 00:28

    but an ulterior motive that it sees, causing injector cutoff.
    but an ulterior motive that it sees, causing injector cutoff.

  • 00:33

    Injector cutoff comes in two flavors, selective and complete.
    Injector cutoff comes in two flavors, selective and complete.

  • 00:38

    Injector cutoff is a DME programming strategy.
    Injector cutoff is a DME programming strategy.

  • 00:42

    It is programmed into the DME unit and may also render the injector completely inoperative.
    It is programmed into the DME unit and may also render the injector completely inoperative.

  • 00:48

    Here are the conditions where the DME may use injector cutoff.
    Here are the conditions where the DME may use injector cutoff.

  • 00:53

    Condition number 1.
    Condition number 1.

  • 00:55

    Engine or vehicle speed limiter.
    Engine or vehicle speed limiter.

  • 00:57

    For engine or vehicle speed limitation, the DME will deactivate injection for individual
    For engine or vehicle speed limitation, the DME will deactivate injection for individual

  • 01:04

    cylinders, allowing a smoother limitation transition.
    cylinders, allowing a smoother limitation transition.

  • 01:08

    This prevents overreving, when the engine reaches maximum RPM, under acceleration, and
    This prevents overreving, when the engine reaches maximum RPM, under acceleration, and

  • 01:14

    limits top vehicle speed to approximately 128 mph.
    limits top vehicle speed to approximately 128 mph.

  • 01:22

    Condition number 2.
    Condition number 2.

  • 01:24

    Idle speed actuation.
    Idle speed actuation.

  • 01:26

    If a fault is detected with the idle speed actuator, the DME will initiate fail-safe
    If a fault is detected with the idle speed actuator, the DME will initiate fail-safe

  • 01:31

    measures and selectively cut pulsation to the injectors, depending on the effect of
    measures and selectively cut pulsation to the injectors, depending on the effect of

  • 01:36

    the fault, as in increased air flow or decreased air flow.
    the fault, as in increased air flow or decreased air flow.

  • 01:41

    If there is a fault in the idle speed actuator circuit, the MDK will compensate to maintain
    If there is a fault in the idle speed actuator circuit, the MDK will compensate to maintain

  • 01:47

    idle speed.
    idle speed.

  • 01:48

    The check enigine lamp will be illuminated to inform the driver of a fault.
    The check enigine lamp will be illuminated to inform the driver of a fault.

  • 01:53

    If the fault causes increased air flow, as in actuator failed to open, VANOS, and Knock
    If the fault causes increased air flow, as in actuator failed to open, VANOS, and Knock

  • 02:00

    Control are deactivated which noticeably reduces engine performance.
    Control are deactivated which noticeably reduces engine performance.

  • 02:06

    Condition number 3.
    Condition number 3.

  • 02:08

    Fault to the throttle controller.
    Fault to the throttle controller.

  • 02:10

    In the event of an MDK or throttle drive by wire unit malfunction, the following actions
    In the event of an MDK or throttle drive by wire unit malfunction, the following actions

  • 02:16

    occur.
    occur.

  • 02:17

    Activation of the check engine warning lamp.
    Activation of the check engine warning lamp.

  • 02:20

    MDK is deactivated, the throttle valve is opened mechanically by the springs.
    MDK is deactivated, the throttle valve is opened mechanically by the springs.

  • 02:26

    To maintain vehicle control, the MDK opening is compensated for by closing the idle speed
    To maintain vehicle control, the MDK opening is compensated for by closing the idle speed

  • 02:33

    actuator and retarding the ignition for engine power reduction.
    actuator and retarding the ignition for engine power reduction.

  • 02:37

    Engine power is further limited by the DME using fuel injector cut off.
    Engine power is further limited by the DME using fuel injector cut off.

  • 02:44

    Condition number 4.
    Condition number 4.

  • 02:45

    Clear flood mode.
    Clear flood mode.

  • 02:47

    Clear-flood mode is activated strictly by a wide-open throttle or high TPS input.
    Clear-flood mode is activated strictly by a wide-open throttle or high TPS input.

  • 02:54

    For this mode to be active, the DME must read a low engine speed value of under 600 RPM
    For this mode to be active, the DME must read a low engine speed value of under 600 RPM

  • 03:00

    and a throttle opening of 85% or higher, usually wide open throttle.
    and a throttle opening of 85% or higher, usually wide open throttle.

  • 03:07

    At this point, the DME reduces injector pulse to an A/F ratio of 20.0:1 or higher.
    At this point, the DME reduces injector pulse to an A/F ratio of 20.0:1 or higher.

  • 03:15

    In most cases, the DME cuts injector pulsation completely.
    In most cases, the DME cuts injector pulsation completely.

  • 03:20

    All this is done in order to purge the cylinders of excess fuel and correct a flooding condition.
    All this is done in order to purge the cylinders of excess fuel and correct a flooding condition.

  • 03:27

    This mode is not used on all fuel control system, which is why some systems will flood
    This mode is not used on all fuel control system, which is why some systems will flood

  • 03:32

    under heavy cranking.
    under heavy cranking.

  • 03:34

    A condition relating to this mode is an engine that will not start due to a high TPS voltage
    A condition relating to this mode is an engine that will not start due to a high TPS voltage

  • 03:40

    and no injector pulse.
    and no injector pulse.

  • 03:42

    In such case, the DME will perceive the high TPS voltage as a W.O.T.
    In such case, the DME will perceive the high TPS voltage as a W.O.T.

  • 03:49

    condition and activate the clear flood mode, thereby, reducing or cutting injector pulse
    condition and activate the clear flood mode, thereby, reducing or cutting injector pulse

  • 03:55

    altogether.
    altogether.

  • 03:56

    The same can also happen if the TPS ground wire develops an open circuit, which would
    The same can also happen if the TPS ground wire develops an open circuit, which would

  • 04:02

    cause a high TPS voltage input signal as well.
    cause a high TPS voltage input signal as well.

  • 04:07

    Condition number 5.
    Condition number 5.

  • 04:10

    Selective injector cut off.
    Selective injector cut off.

  • 04:12

    Selective injector cut-off mode is activated whenever there is a dangerous condition affecting
    Selective injector cut-off mode is activated whenever there is a dangerous condition affecting

  • 04:17

    the engine.
    the engine.

  • 04:18

    This is a fairly new feature in fuel control systems, designed not only to protect the
    This is a fairly new feature in fuel control systems, designed not only to protect the

  • 04:24

    engine, but the catalytic converter as well.
    engine, but the catalytic converter as well.

  • 04:27

    New regulations require manufacturers to guarantee the converter for up to 8 years or 80 thousand
    New regulations require manufacturers to guarantee the converter for up to 8 years or 80 thousand

  • 04:33

    miles.
    miles.

  • 04:35

    This makes selective injector cut-off a prime feature for catalytic converter protection
    This makes selective injector cut-off a prime feature for catalytic converter protection

  • 04:40

    in case of a misfire.
    in case of a misfire.

  • 04:42

    The selective injector cutoff mode is also used in torque management situations where
    The selective injector cutoff mode is also used in torque management situations where

  • 04:47

    torque reduction is needed.
    torque reduction is needed.

  • 04:49

    An example is the point when the transmission is shifting gears or the traction control
    An example is the point when the transmission is shifting gears or the traction control

  • 04:54

    system is activated.
    system is activated.

  • 04:56

    In these two examples, torque reduction is needed in order to protect the power train
    In these two examples, torque reduction is needed in order to protect the power train

  • 05:01

    components from sudden high torque conditions.
    components from sudden high torque conditions.

  • 05:05

    Another need for this operational mode is during high engine temperature conditions,
    Another need for this operational mode is during high engine temperature conditions,

  • 05:10

    whereby, the fuel injection pulse is cut-off intermittently to four cylinders at a time
    whereby, the fuel injection pulse is cut-off intermittently to four cylinders at a time

  • 05:16

    to prevent the engine from overheating damage.
    to prevent the engine from overheating damage.

  • 05:19

    By reducing the cylinder combustion intermittently, the engine generates less heat, saving it
    By reducing the cylinder combustion intermittently, the engine generates less heat, saving it

  • 05:25

    from damage.
    from damage.

  • 05:28

    Condition number 6.
    Condition number 6.

  • 05:30

    Deceleration fuel cut off.
    Deceleration fuel cut off.

  • 05:32

    When your vehicle is moving forward, with zero throttle and is in gear or engine braking,
    When your vehicle is moving forward, with zero throttle and is in gear or engine braking,

  • 05:38

    the DME cuts off the fuel flow to the injectors.
    the DME cuts off the fuel flow to the injectors.

  • 05:42

    This means you are experiencing forward movement with no fuel cost.
    This means you are experiencing forward movement with no fuel cost.

  • 05:46

    How long does it take the engine to enter and leave the deceleration cut off mode?
    How long does it take the engine to enter and leave the deceleration cut off mode?

  • 05:51

    The transition takes between 500 and 750 milliseconds, depending on several other DME measurements.
    The transition takes between 500 and 750 milliseconds, depending on several other DME measurements.

  • 06:00

    What will make the DME leave deceleration mode?
    What will make the DME leave deceleration mode?

  • 06:03

    Touching the accelerator, Dropping below 1,000 RPM and Putting the transmission in neutral
    Touching the accelerator, Dropping below 1,000 RPM and Putting the transmission in neutral

  • 06:10

    and disengaging the clutch will render deceleration cut off useless.
    and disengaging the clutch will render deceleration cut off useless.

All noun
cutoff
/ˈkədäf/

word

limit

BMW Injector Cutoff Circuit

40,078 views

Intro:

BMW DME Injector Cutoff Circuit Strategy. BMW has used the injector cutoff strategy in various forms for many years now.
The importance of this is that a technician may approach an engine with non pulsing injectors
and make it seems as if the DME itself is defective, then the issue is not the DME,
but an ulterior motive that it sees, causing injector cutoff.
Injector cutoff comes in two flavors, selective and complete.
Injector cutoff is a DME programming strategy.. It is programmed into the DME unit and may also render the injector completely inoperative.
Here are the conditions where the DME may use injector cutoff.
Condition number 1.. Engine or vehicle speed limiter.. For engine or vehicle speed limitation, the DME will deactivate injection for individual
cylinders, allowing a smoother limitation transition.
This prevents overreving, when the engine reaches maximum RPM, under acceleration, and
limits top vehicle speed to approximately 128 mph.. Condition number 2.. Idle speed actuation.. If a fault is detected with the idle speed actuator, the DME will initiate fail-safe
measures and selectively cut pulsation to the injectors, depending on the effect of
the fault, as in increased air flow or decreased air flow.

Video Vocabulary

/pəls/

verb

To beat in a rhythm.

/dəˈpend/

verb

Be controlled or determined by..

/ˈverēəs/

adjective determiner pronoun

different from one another. more than one. more than one.

/ˈprōˌɡramiNG/

noun verb

Writing computer code for a piece of software. To write computer code for a piece of software.

/ˈkämpənˌsāt/

verb

give someone something in recognition of loss.

/ˈsmo͞oT͟Hər/

adjective noun

Being more smooth or flat than. device or substance used to give something flat, regular surface or appearance.

/tekˈniSHən/

noun

person employed to look after technical equipment or do practical work in laboratory.

/ˈmaksəməm/

adjective adverb noun

as great as possible or permitted. at most. greatest amount.

/iˈlo͞ominādəd/

adjective verb

lit with bright lights. To supply light to something.

/əˈprōCH/

noun verb

Request of someone with a specific goal in mind. come nearer to.

/rēCH/

noun verb

act of reaching out with one's arm. To come to or arrive at a goal or destination.

/ˌliməˈtāSH(ə)n/

noun

restriction.

verb

become or make greater in size or degree.

/inˈjektər/

noun

person or thing that injects something.

/kənˈdiSH(ə)n/

noun other verb

state of something. Things necessary in order for some things to occur. To improve something to make it better.