MoTeC M8 User Manual
M oTe C M4, M48 & M8 User’s Manual
Contents
Introduction ........................................................................ 1
Additional Documentation ...................................................................................1
Overview ............................................................................. 2
Options ...............................................................................................................2
Calibration & Setup .............................................................................................3
ECU Inputs & Outputs......................................................................................... 5
MoTeC Software .................................................................. 9
Connecting a PC to the ECU ..............................................................................9
DOS Prompt .......................................................................................................9
Software Installation.......................................................................................... 10
Starting the Software ........................................................................................10
Software Versions............................................................................................. 10
E.M.P Software................................................................................................. 11
Data Logging.....................................................................................................12
Upgrading .........................................................................................................13
Installation ........................................................................ 14
Throttle Position or MAP Load Sensing ............................................................14
Sensors............................................................................................................. 15
Wiring................................................................................................................ 18
Fuel System...................................................................................................... 21
Ignition System .................................................................................................25
Auxiliary Valves................................................................................................. 27
ECU Mounting................................................................................................... 27
ECU Cleaning ................................................................................................... 28
Initial Setup....................................................................... 29
Main Setup........................................................................................................ 29
Miscellaneous Setup......................................................................................... 30
Sensor Setup .................................................................................................... 30
RPM Limit ......................................................................................................... 31
Input / Output & Misc Functions........................................................................ 31
Initial Calibration .............................................................. 32
Fuel Tables ....................................................................................................... 32
Ignition Tables .................................................................................................. 33
Cold Start.......................................................................................................... 34
Acceleration Enrichment ...................................................................................34
i
Initial Starting Procedure ................................................ 35
Pre Start Checks............................................................................................... 35
Starting .............................................................................................................37
After Start Checks............................................................................................. 38
Calibration ........................................................................ 41
Site Tables........................................................................................................ 41
Dyno .................................................................................................................42
Fuel - Main Table.............................................................................................. 42
Ignition - Main Table .........................................................................................43
Fuel - Injection Timing....................................................................................... 44
Cold Start.......................................................................................................... 44
Other Calibration Tables ................................................................................... 44
Data Logging & Road Testing........................................................................... 45
E.M.P. Software ................................................................ 46
Main Screen...................................................................................................... 46
Main Menu ........................................................................................................ 47
Context Sensitive Help...................................................................................... 48
Files .................................................................................................................. 48
Calibration and Setup .......................................................................................48
Calibration Screens........................................................................................... 50
For racing and off highway use only
Not legal on emissions controlled vehicles unless appropriately certified
Copyright - Electronic Performance Systems Pty Ltd - 1996
The information in this document is subject to change without notice.
No responsibility will be taken for the consequences of any inaccuracies occurring in this manual.
6 June, 2003
ii
M oTe C Introduction 1
Introduction
Thankyou for purchasing a M oTe C Engine Management System.
This manual will help you understand the installation and calibration
requirements of your M oTe C Engine Management System.
Additional Documentation
Additional documentation is available in the form of Drawings and Tech
Notes. Please consult your local M oTe C distributor for details.
Drawing Categories
Accessories
ECUs
Looms
Ignition Modules
Combined Module & Trigger Systems
Trigger Systems
Valves
Sensors
Miscellaneous
Note that the M48 uses the M4 drawings unless there is a specific M48
drawing.
Tech Notes
Traction Control
Boost Control
Idle Speed Control
Closed Loop Lambda Control
Wide Band Lambda Sensor
Others
2 Overview
Overview
The M oTe C M4, M48 & M8 are powerful and compact programmable Engine
Management Systems or Engine Control Units (ECUs)
M4 ECU
The M4 ECU has 4 Fuel Injector outputs and is referred to as a 4 Group
Engine Management System.
M48 ECU
The M48 ECU has 8 Fuel Injector outputs and is referred to as an 8 Group
Engine Management System but is otherwise similar to the M4 ECU, except
for the following :
Two Ignition outputs instead of four.
Two PWM (Pulse Width Modulated) Auxiliary Outputs and 2 Switched
Auxiliary Outputs instead of 4 PWM Auxiliary Outputs.
No individual cylinder tables (Still does individual cylinder trims).
M8 ECU
The M8 ECU has 8 Fuel Injector outputs and is also referred to as an 8
Group Engine Management System.
The M8 has additional inputs and outputs compared to the M4 & M48.
Options
A number of options are available which allow the ECU to be configured for a
particular need and updated later if necessary.
The options may be enabled at any time by entering an enabling password
using the M oTe C ENABLE Software.
The passwords may be purchased from M oTe C .
The M4 or M8 Software Update Unit (SUU) is required to enable the
options. The SUU must be connected between the ECU and the Computer
Interface Cable. (The M4 SUU is also used for the M48).
M oTe C Overview 3
Advanced Tuning Option (M4 and M48 Only)
Allows access to the Advanced Tuning features, which include :
Traction Control & Launch Control, Narrow Band or Wide Band Lambda
Control, Gear Change Ignition Cut, Individual Cylinder Tuning for Fuel and
Ignition, Boost Enhancement, Wheel Speed Measurement, Programmable
Load Sites, Warning Alarms, User definable Air Pressure, Air Temp, Engine
Temp and other compensations for Fuel and Ignition, Nitrous Oxide, Dual
RPM Limit, Sensor Calibration Tables, Odd Fire Engine capability and more.
Advanced Tuning is standard on the M8 ECU.
The Advanced Tuning setup parameter must also be set to enable
Advanced Tuning.
Data Logging Option
Allows logging of the ECU sensors and operating parameters to the internal
data logging memory. The logged data may then be analysed by the M oTe C
INTERPRET Software.
On the M4 and M48 ECUs the Data Logging option is enabled for an
evaluation period of 6 hrs (engine running time).
Wide Band Lambda Option
Allows Wide Band Lambda (Air Fuel Ratio) measurement, which may be used
for data logging or closed loop control of the Air Fuel Ratio. The measurement
is fully temperature compensated and will accurately measure ratios of 0.75
to 1.2 Lambda (11:1 to 18:1) when used with the M oTe C wide band exhaust
gas sensor.
The M8 ECU has two Lambda Inputs whereas the M4 and M48 have one.
On the M4 and M48 ECUs the Wide Band Lambda option is enabled for a
evaluation period of 6 hrs (engine running time).
Calibration & Setup
Calibration Tables
The Calibration Tables determine how the output devices should be
controlled for various sensor readings. For example the fuel calibration table
determines the base injector pulse width for all combinations of RPM and
4 Overview
Load. Various other calibration tables will also affect the fuel injector pulse
width.
A typical 3 dimensional fuel calibration table is shown below.
LOAD 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
38.0 40.0 41.0 43.0 45.5 55.0 53.0 55.0 56.5 58.0 59.5 60.5 62.0 64.0 62.0
100
38.0 39.0 40.0 42.0 42.0 50.0 50.5 51.0 52.5 52.5 55.5 57.5 59.5 61.5 59.5
90
38.0 39.0 39.5 41.5 40.5 45.5 48.0 45.5 46.5 49.0 51.5 53.5 55.5 56.0 55.5
80
38.0 38.5 39.0 40.0 38.5 42.5 43.5 43.0 43.0 43.5 46.5 44.5 44.0 44.5 44.0
70
38.0 38.0 39.0 39.5 37.5 38.0 41.0 41.0 41.5 41.0 43.5 42.5 41.5 42.0 41.5
60
38.0 38.0 38.5 39.0 37.0 36.0 39.0 39.5 39.0 40.0 41.0 39.0 38.0 38.0 38.0
50
32.0 31.5 32.0 33.0 32.0 31.0 33.0 34.0 33.5 34.5 35.5 34.5 33.5 33.5 33.5
40
25.5 26.0 25.5 27.0 26.0 27.0 28.0 29.0 28.5 28.0 28.0 28.0 28.0 27.0 28.0
30
20.5 21.0 29.5 20.5 21.5 22.5 22.5 25.5 27.5 27.0 26.0 27.0 26.0 25.0 26.0
20
18.0 17.5 17.0 18.5 18.5 19.5 19.5 22.0 24.0 24.5 24.5 24.5 24.5 22.5 24.5
10
14.0 14.0 14.5 15.0 15.5 16.5 18.0 20.0 20.0 21.0 20.5 20.0 20.0 19.5 20.0
0
The calibration tables may be represented graphically as shown below.
FUEL
RPM
LOAD
RPM
The ECU determines the amount of fuel to inject by first calculating the RPM
and Load then extracting the corresponding value from the table. If the RPM
and Load do not match an RPM and LOAD point exactly then the values from
the closest sites are mathematically interpolated to arrive at an intermediate
value.
2D Calibration Tables
2D calibration tables have 3 load sites only : Light Load, Full Load and Boost.
2D calibration is not as precise as 3D calibration, a more accurate result will
be obtained using 3D calibration.
M oTe C Overview 5
Setup Parameters
The Setup Parameters allow the ECU to be configured for almost any engine.
The Setup Parameters include Number of Cylinders, Ignition Type, Sensor
Types, Injector Current, Auxiliary Output Functions etc.
The Setup Parameters must be correct before attempting to start the
engine.
ECU Inputs & Outputs
The ECU analyses signals from the sensors, then controls the Fuel Injectors,
Ignition System and other auxiliary devices according to the Calibration and
Setup Data which is stored in the ECUs programmable memory.
INPUTS OUTPUTS
Main Engine Sensors
Trigger Sensors
Throttle Position
Manifold Pressure
Engine Temp
Inlet Air Temp
Optional Sensors
Wide Band Mixture Sensor
Wheel Speed or Switch
Wheel Speed or Switch
eg. Exhaust Gas Temp
eg. Intercooler Temp
M4 or M48
ECU
REF
SYNC
TP
MAP
ET
AT
Lambda
Dig Input 1
Dig Input 2
Aux Temp
Aux Volt
Injector 1
Injector 2
Injector 3
Injector 4
(Injector 5)
(Injector 6)
(Injector 7)
(Injector 8)
IGN 1
AUX 1
AUX 2
AUX 3
AUX 4
Fuel Injectors
(4 Injectors on M4)
(8 Injectors on M4-8)
Ignition Output 1
Auxiliary Output 1
Ignition or
Auxiliary Outputs
eg. Waste Gate Valve
eg. Idle Speed Valve
eg. Fuel Pump Relay etc
6 Overview
INPUTS OUTPUTS
Main Engine Sensors
Trigger Sensors
Throttle Position
Manifold Pressure
Engine Temp
Inlet Air Temp
Optional Sensors
Wide Band Mixture Sensors
Wheel Speed or Switch
Wheel Speed or Switch
Wheel Speed or Switch
Wheel Speed or Switch
Exhaust Manifold Pressure
Fuel Pressure
Fuel Temp
eg. Exhaust Gas Temp
eg. Intercooler Temp
eg. Gear Box Temp
ECU
REF
SYNC
TP
MAP
ET
AT
Lambda 1
Lambda 2
Dig Input 1
Dig Input 2
Dig Input 3
Dig Input 4
EMAP
FP
FT
Aux Temp 1
Aux Temp 2
Aux Temp 3
Aux Temp 4eg. Diff Temp
Injector 1
Injector 2
Injector 3
Injector 4
Injector 5
Injector 6
Injector 7
Injector 8
IGN 1
IGN 2
IGN 3
IGN 4
PWM1
PWM2
SW1
SW2
Fuel Injectors
Ignition Outputs
Ignition 1 (Shared with Dig Input 4)
Ignition 2 (Shared with Dig Input 3)
Ignition 3 (Shared with Dig Input 2)
Ignition 4 (Shared with Dig Input 1)
Auxiliary Outputs
eg. Waste Gate Valve
eg. Idle Speed Valve
eg. Fuel Pump Relay etc
Main Engine Sensors
The Main Engine Sensors are required for correct operation of the ECU.
The engine RPM is derived from the REF trigger sensor.
The SYNC trigger sensor is required for Sequential Injection or Multi Coil
Ignition Systems.
M8
The Throttle Position, Manifold Pressure, Air Temp and Engine Temp are
used as inputs to the various calibration tables.
Optional Sensors
The Optional Sensors are not required for basic operation of the ECU.
The Digital Inputs may be used for wheel speed measurement or to activate
functions such as Dual RPM Limit, or Nitrous. (Advanced Tuning Only)
The Lambda Inputs may be used for wide band air fuel ratio measurement or
wide band or narrow band closed loop lambda control.
The other inputs may be used for data logging or for special calibration
features.
M oTe C Overview 7
Fuel Injector Outputs
M4 ECU
Up to four groups of injectors may be driven by the ECU.
On engines with more than 4 cylinders 2 or more injectors must be driven in
parallel as follows :
6 cyl 3 groups of 2 injectors (Outputs 1, 2 and 3)
8 cyl 4 groups of 2 injectors
12 cyl 4 groups of 3 injectors
The Injector current must be doubled or trebled as appropriate.
M48 & M8 ECU
Up to eight groups of injectors may be driven by the ECU.
On 12 cylinder engines the injectors must be driven as 6 groups of 2 injectors
in which case the Injector current must be doubled.
Ignition Outputs
The Ignition System Outputs may be used to drive many different types of
ignition modules, which are detailed in the various ignition drawings.
M4 ECU
Up to 4 ignition outputs are available for multi coil applications.
Ignition Outputs 2, 3 & 4 are shared with Auxiliary Outputs 2, 3 & 4.
Outputs not used for ignition may be used as Auxiliary Outputs.
M48 ECU
Two ignition outputs only.
M8 ECU
Up to 4 ignition outputs are available for multi coil applications.
Ignition Outputs 2, 3 & 4 are shared with Digital Inputs 1, 2 & 3.
Any pins not used as Ignition Outputs may be used as Digital Inputs.
8 Overview
All ECUs
All ECUs may drive up to 8 coils when used with the M oTe C Ignition
Expander.
Auxiliary Outputs
The Auxiliary Outputs may be used for :
Turbo Waste Gate Control, Idle Speed Control, Gear Change Light, Driver
Warning Alarm, Tacho Output, Fuel Pump Control, Thermatic Fan Control,
Fuel Used Signal, Air Conditioner Fan Control, Air Conditioner Clutch Control,
RPM / Load Activated Output, others.
M4 & M48
The ECU has four Auxiliary Outputs which may be used as follows :
Standard Tuning
Auxiliary Output 1 : User definable.
Auxiliary Output 2 : Tacho Output on M48, not used on M4.
Auxiliary Output 3 : Tacho Output on M4, not used on M48.
Auxiliary Output 4 : Fuel Pump Control.
Advanced Tuning
All Auxiliary Outputs are user definable.
Note that Auxiliary Outputs 3 and 4 on the M48 ECU cannot be
used for PWM functions such as turbo waste gate control or idle
speed control.
M8
All Auxiliary Outputs are user definable.
Note that the two Switched Outputs cannot be used for PWM functions
such as turbo waste gate control or idle speed control.
M oTe C M oTe C Software 9
MoTeC Software
The M oTe C Software is a collection of software programs that allow the user
to perform various tasks such as Calibration, Setup, Diagnostics, Data
logging Analysis, Upgrading etc.
The software will only run on an IBM PC compatible computer.
Different software is required for all three types of ECU.
Connecting a PC to the ECU
The PC must be connected to the ECU via the M oTe C Computer Interface
Cable as shown below. The cable must be connected the right way around
(one end is labelled ECU), the other end must be connected to the PC
connector marked COM1. The cable is a special cable that contains
electronic circuitry, a standard cable will not work.
M4
ECU
PC
Computer Interface Cable
ECU
DOS Prompt
The M oTe C Software must run from the DOS prompt.
DOS If using a menu program, first exit to DOS
Windows 3.1 First exit to the DOS prompt as follows :
From the Program Manager menu select File - Exit.
Windows 95 First start an MS-DOS box as follows :
Select : Start - Programs - MS-DOS Prompt
10 M oTe C Software
Software Installation
The M oTe C Software must be installed on to the PC hard disk.
To install the software place the M oTe C Software Disk into the floppy disk
drive.
From the DOS prompt type A:INSTALL then press Enter. The software will
be automatically installed onto the hard disk.
A separate directory is automatically created for each version of the software.
Old versions are kept so that they may be used if necessary.
Do not change the M oTe C directory structure or move the software to a
different directory, otherwise the software will not operate correctly.
Starting the Software
Start the M oTe C Software from the DOS prompt [ C:\ ] by typing MOTEC then
press Enter, this will start the M oTe C Program Integrator.
If the software doesn’t start it may be necessary to change to the MOTEC
directory first by typing CD \MOTEC then press Enter.
The M oTe C Program Integrator lists all the available software programs. To
start the required program select it from the menu using the up and down
arrow keys then press Enter.
To exit the M oTe C Program Integrator and return to DOS, hold down the Alt
key then press X.
If using a monochrome screen press the F9 key to change the screen
colours between colour and black and white.
When using Windows 95 it is best to run the software in a full screen
rather than a window. (Press Alt and Enter)
Software Versions
The software will only work with an ECU that is the same type (M4, M48 or
M8) and is running the matching software version.
If multiple versions of the software are installed on the PC a list of the
available ECU types and versions will be displayed when the M oTe C Program
Integrator is started. The appropriate ECU type and version may then be
M oTe C M oTe C Software 11
chosen. The currently selected ECU type and version are shown at the top
right of the screen as shown below.
Currently Selected Type and VersionSelect Version Menu
To check which version of the software a particular ECU is running, start the
latest version of the E.M.P. Software. If the ECU is not the correct type or the
ECU software version does not match, then a screen will be displayed that
will show the current ECU type and version.
To change to another ECU type or version press the Esc key while in the
M oTe C Program Integrator, this will re-display the Select Version menu.
The appropriate ECU type and version may then be chosen.
The ECU software version contains an extra digit which may be ignored. For
example ECU versions 4.60, 4.61 etc are all compatible with PC software
version 4.6 (V46).
If the PC does not contain the matching version then the matching version of
the PC software must be installed onto the PC or the ECU must be upgraded
to an available version.
E.M.P Software
The M oTe C Engine Management Program (E.M.P.) is used for Calibration,
Setup and Diagnostics.
12 M oTe C Software
E.M.P. includes the following features :
Storage of the Calibration Data on disk.
Transfer of any Calibration Data File from the PC into any ECU.
3 Dimensional Graphing of the Calibration Data.
Viewing of all sensor readings and other ECU operating parameters.
Injector, Ignition & Aux Output testing while the engine is stopped.
Extensive Help (Press the F1 key).
The E.M.P. Software is covered in more detail later in this manual.
Data Logging
Data Logging allows the ECU operational data to be recorded in a memory
chip inside the ECU, the data may then be extracted for analysis on a PC.
Data logging is extremely useful for checking mixture readings, sensor
readings, diagnostics errors and other operating information.
The items to be logged and the logging rates must be setup using the M oTe C
E.M.P. Software. This is done in the Misc Setup or Data Logging Setup
menus depending on the software version.
The logged data can be extracted from the ECU using the M oTe C
INTERPRET Software or by using the M oTe C GETLOG Software depending
on the software version.
The M4 & M48 ECUs will remember the logged data even if the ECU
power is turned off. The M8 ECU requires power to be maintained to the
ECU until the logged data has been extracted.
If the logging memory becomes full the oldest data is overwritten so that
the most recent data is always available.
The ECU must have the Logging option to perform data logging.
Data Logging Analysis
The M oTe C INTERPRET Software may be used to analyse the logged data.
The INTERPRET Software makes it easy to analyse mixture readings and
other sensor readings by presenting the data in various graphical formats.
Refer to the INTERPRET help screen for more detail.
M oTe C M oTe C Software 13
Upgrading
The ECU Control Software controls the function of the ECU. Upgrading the
control software allows the latest features to be added to any ECU.
When the ECU control software is upgraded the ECU calibration data must
also be upgraded so that it compatible with the new ECU software.
The M oTe C UPGRADE Software is used to upgrade the ECU control software
and calibration data.
Upgrade ECU
To upgrade the ECU select Upgrade ECU from the UPGRADE Software
menu. This will send the new ECU control software to the ECU and
automatically convert the existing ECU calibration data.
To upgrade the software the M4 or M8 Software Update Unit (SUU) is
required. The SUU must be connected between the ECU and the
Computer Interface Cable. (The M4 SUU is also used for the M48).
Convert Files
The UPGRADE software is also used to convert any old calibration files so
that they are compatible with the new software version, select Convert Files
from the menu.
Calibration files may be converted between the M4 and M48 or vice versa but
M8 files cannot be converted to or from M4 or M48 files.
Software Version Release Notes
The changes between the various software versions may be viewed using the
M oTe C NOTES Software.
14 Installation
Installation
Throttle Position or MAP Load Sensing
The load point for the fuel and ignition calibration tables may be based on the
Throttle Position sensor or the MAP (Manifold Pressure) sensor.
Turbo Charged Engines
Use Manifold Pressure load sensing (connect the MAP sensor to the inlet
manifold).
A Throttle Position sensor is optional and will be used for acceleration
enrichment if fitted.
Partial barometric pressure compensation will be achieved using the MAP
sensor only. For improved compensation an additional pressure sensor must
be connected to the Aux V input on M4 & M48 (EMAP on M8) and the load
calculation method should be selected as MAP / Aux V for M4 & M48 (MAP /
EMAP for M8). This additional sensor should be vented to atmospheric
pressure.
Normally Aspirated Engines
3D Fuel and Ignition Tables
Use Throttle Position load sensing.
The MAP sensor may be used to compensate for barometric pressure
changes by venting it to atmospheric pressure.
If Idle Speed Control is used then the MAP sensor should be connected to
the plenum or Manifold Pressure load sensing should be used. This is
required so that the fuel is varied as the idle speed control valve opens
and closes.
2D Fuel and Ignition Tables
Use Manifold Pressure load sensing, see Turbo Charged Engines above. Not
suitable for multi-runner engines, engines with erratic pressure readings, or
very low vacuum.
M oTe C Installation 15
Sensors
Throttle Position Sensor
The Throttle Position sensor must produce a voltage between 0 and 5 volts,
proportional to the angle of the throttle plate. Switch types are not suitable.
Throttle sensors generally have a dead band at either end and must be preloaded to avoid the dead band.
The Setup Parameters TPHI and TPLO must be set to indicate the fully
closed and fully open positions. These parameters must be set any time the
sensor is moved or replaced. It is very important to set these parameters with
the butterfly in exactly the same place each time.
The resistance element inside the sensor may wear due to vibration in high
performance engines, this can cause erratic readings. It is best to replace the
throttle position sensor periodically.
Avoid high pressure washing as this may penetrate the seals and damage the
sensor.
For wiring details refer to the appropriate M oTe C drawing.
MAP Sensor
The MAP (Manifold Absolute Pressure) sensor measures Absolute Pressure
(ie. pressure relative to a vacuum).
0 kPa Absolute = Complete Vacuum
100 kPa = 1 Bar = 14.5 PSI
Atmospheric Pressure at sea level is approximately 100 to 102 kPa,
depending on the day.
The sensor produces a voltage between 0 and 5V, depending on the
pressure.
The pressure sensor may be used to measure the inlet manifold pressure or
to measure the barometric pressure depending on the Load Sensing
arrangement detailed earlier.
The ECU Sensor Setup parameters must be set to indicate the type and
pressure range of the sensor.
Avoid severe vibration of the sensor as this can cause fluctuations in the
reading. Do not mount rigidly to the engine. Normally the pressure sensor is
mounted to the vehicle body.
16 Installation
If used for Manifold Pressure Sensing
For normally aspirated engines use a 100 kPa sensor.
For turbo charged engines a 300 kPa absolute sensor will measure up to 200
kPa (29 psi) of boost (above Atmospheric). If higher boost will be used a
sensor with a higher pressure range will be needed.
The sensor should be connected to the inlet manifold plenum via a short hose
(less than 1m). The sensor should be mounted above the level of the plenum
with the port facing down to avoid moisture accumulating on the sensor
element. The hose should run downwards all the way to the plenum.
The plenum take off point should be at a position that best represents the
average manifold pressure and has minimal pressure pulsations. A small
restrictor may be needed at the manifold end of the hose to help reduce
pressure pulsations. The take off point should not be teed in with other items
such as idle speed control valves as they can affect the pressure reading.
If used for Barometric Pressure Sensing
Use a 100 kPa or 105 kPa sensor.
Vent the sensor to the atmosphere with the port facing down.
Avoid mounting at a point where air buffeting occurs, any pressure
fluctuations will directly affect the mixture.
It may be desirable to sense the pressure at the air intake as the pressure
may vary due to aerodynamic effects.
Air Temp Sensor
The Air Temperature sensor is mainly used to correct for air density change
due to air temperature variation.
The sensor contains a temperature dependant resistor and is designed for
high speed response in an air flow.
The Air Temp sensor must be placed to measure the air temperature before
the butterfly (and after the inter cooler on turbo charged engines).
Avoid placing the sensor too close to the stand-off vapour in a multi-runner
manifold as this will cool the sensor and give a false reading.
The ECU Sensor Setup parameters must be set to indicate the particular type
of sensor.
M oTe C Installation 17
Engine Temp Sensor
The Engine Temperature sensor is mainly used for cold start enrichment.
The sensor contains a temperature dependant resistor and is designed for
water immersion.
The ECU Sensor Setup parameters must be set to indicate the particular type
of sensor.
Trigger Sensors (REF & SYNC)
The trigger sensors supply the necessary timing information to the ECU so
that it knows when to fire the fuel injectors and ignition system. Generally two
sensors are used, REF and SYNC.
Many different types of trigger sensors and chopper patterns may be used.
The wiring and ECU setup information for the trigger sensors are specific to
the particular system. Refer to the appropriate M oTe C drawing.
Home made sensor systems often cause problems. Do not use Chrome molly
for chopper disks as it is a non magnetic material. Runout of the disk,
imperfections and boltheads are also potential sources of problems. Where
possible it is best to use the manufacturers trigger system.
REF Sensor
Supplies the crank position information.
Some sensors supply one pulse per Top Dead Centre (4 pulses per engine
rev on a V8), others supply as many as 360 pulses per engine rev.
The Engine RPM is derived directly from this signal.
SYNC Sensor
Used to indicate each engine cycle, which is required for sequential injection
and multi coil operation.
Generally supplies one pulse per engine cycle (2 revs on a 4 stroke engine).
On some special trigger systems the ECU can be synchronised using the
REF sensor only (eg. Ford Narrow Tooth)
REF / SYNC Alignment
Most modern distributors supply both REF and SYNC signals in which case
the alignment is preset.
Loading...