ECU-57N / ECU-88L / ECU-88N

INSTRUCTION MANUAL
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LOW OIL
PRESSURE
HIGHWATER
TEMPERATURE
OVERCRANK

OVERSPEED

ENGINE STARTED

FRONT VIEW SIDE VIEW BACK VIEW SIDE VIEW

These units are the most advanced, rugged and compact engine control modules
we have ever built. They are simple to use but this manual will assist both
engineer and mechanic alike in the installation and operation of these controls.
The following pages have in order: wiring and operation, expansion, adjustment,
specifications, physical drawing, drilling guide and warranty information.

SPECIFICATIONS PHYSICAL DRAWING

Temperature Range -40 TO +85 C
Voltage Range 9 to 28 VDC
Vibration 10 G's
Standby Current 0 Amps
Operating Current 200 mA
Maximum life cycles 50 000
Starter and Fuel Cutout 5 Amps
Signal outputs (total) 1 Amp
Speed input voltage range 2 to 15 Volts
Input Impedance 5 kohms
Weight 12 oz.
Crank Cycle Time Single 2 sec to 1 5 min
Crank Cycle Time Multi 2 to 60 sec
.26
Crank attempts 1 to 8 1.50 6.6
Low oil pressure delay 1 to 60 sec INCH 38.1
MM
Crank disconnect trip 250 Hz to 8500 Hz BACK VIEW SIDE VIEW
Overspeed trip 250 Hz to 8500 Hz
Verify mode 87 % of set point Mounting holes will accept No. 8 or No. 6 screws .

• All specifications are subject to change without notice.

This information front and back is protected by copyright 1996 and ECU® isa registered trademark of
Engineering Concepts Unlimited Inc. 8950 Technology Drive Fishers, IN. 46038 Phone 317-849-8470
 AUTO
REMOTE
REMOTE START
STANDBY

•
CONTACTS OFF

MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

In the Standby mode the Engine Control Switch is in the Auto position as the module monitors the Remote
Start Contacts. All that is required for cranking to begin is the closure of the Remote Start Contacts shown
connected across terminals 13 and 14.

ENGINE
CRANK
CYCLE
REMOTE
START
CONTACTS
AUTO

OFF
•
MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP
2
MAGNETIC
PICKUP 1

Closure of the Remote Start Contacts while in AUTO initiates the Crank mode.The Fuel Relay and Starter Relay
are energized causing the engine to begin cranking. The Crank mode will continue for the duration of the
settings of the Crank Cycle Adjust and the Dip Switch, unless Overcrank occurs first. During the Engine Crank
Cycle the Low Oil Pressure Switch is ignored. To set Cycle Time and Crank Attempts see adjustments page.
•
 AUTO
REMOTE
ENGINE START

•
REST CONTACTS
OFF

CYCLE MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

The REST cycle is a pause in the cranking sequence and only applies if Dip Switch 4 on the module is in the
Off position. In this mode Fuel is still applied to the engine but the Starter Relay signal is turned off. The cycle
continues for the duration of the Cycle time Adjustment Setting. The Low Oil Pressure fault signal input is
ignored. To set Cycle Time and Crank Attempts see adjustments page .

• CRANK
DISCONNECT
REMOTE
START
CONTACTS
AUTO

OFF

MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

• If the internal speed switch detects a speed equal or above the Crank Disconnect Adjustment Setting the
starter relay signal turns off, the Low Oil Pressure delay timer is initiated and the appropriate signals indicate as
shown. The LED versions indicate via an LED also. This is a latched condition and must be reset by placing the
Engine Control Switch in the Off position. The internal speed switch uses the Magnetic Pickup for speed
detection.
 AUTO
REMOTE
OVERCRANK START
FAULT

•
CONTACTS OFF

MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

If the engine does not start in the allotted time, as determined by the Crank Cycle Adjust and the Dip Switch
settings, the Overcrank Fault occurs. The Fuel and Start relays are turned off and the appropriate signals
indicate as shown. The LED versions indicate via an LED also. The Overcrank condition is a latched condition

•
and must be reset via the Engine Control Switch. See Adjustments page for proper settings of adjustments .

AUTO
REMOTE
OVERS PEED START
FAULT CONTACTS OFF

MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

The Overspeed fault is armed at engine cranking. If the internal speed switch detects a speed equal or above
the Overspeed Adjustment Setting the engine is shutdown immediately. The internal speed switch uses the
Magnetic Pickup for speed detection. The Fuel Relay is turned off, the Low Oil Pressure switch is locked out
and the appropriate signals indicate as shown. The LED versions indicate via an LED also. The Engine Switch
must be placed in OFF for reset. See Adjustments page for speed adjustments.
•
 AUTO
HIGH WATER REMOTE
START
TEMPERATURE

•
CONTACTS OFF

FAULT
MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

If the High Water Temperature Switch closes the engine will be shut down immediately. System indicates as
shown and the LED versions indicate via an LED also. The Engine Switch must be placed in OFF and the engine
allowed to cool for reset. The above circuit is grounded fault if you are using positive fault tie your fault switch

•
common to terminal 13 .

AUTO
LOW OIL REMOTE
START
PRESSURE CONTACTS OFF

FAULT
MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

• Upon crank termination the Low Oil Pressure time delay begins. After this delay period if the Low Oil Pressure
switch closes the engine will shutdown immediately. The Fuel Relay is turned off and the appropriate signals
indicate as shown. The LED versions indicate via an LED also. The Engine Switch must be placed in OFF for
reset. The above circuit is grounded fault if you are using positive fault tie your fault switch common to
terminal 13. See Adjustments page for delay time adjustments.
 AUTO
NORMAL REMOTE
START

•
SHUTDOWN CONTACTS OFF

LAMP TEST
MANUAL
88L/88N ONLY
15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
POTS AND
ENGINE STARTED LAMP
3 SWITCHES SEE
ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAGNETIC
PICKUP 1

To stop engine place switch in the OFF position and engine will shut down immediately. The Fuel Relay is
turned off and the unit draws no power. If the unit is an LED version lamp test may be applied as shown and
all LEDS will light. Since the output system is totally independent of the signal system Lamp Test can be

•
actuated at any time with no possibility of backfeed.

ADJUSTMENTS PAGE DRILLING TEMPLATE

TURN POTS CLOCKWISE TO
INCREASE SETTING
- - - - - - - - - - 2.65
POTS ARE 25 TURN AND CAN NOT
BE DAMAGED BY EXCESS TURNS
.35
DRILLING
1 2 3 4 5 8.89
TEMPLATE 7 .62

12345 SWITCH 5 ON FOR

OVERSPEED VERIFY

REDUCES TRIP SPEED

.35
8.89
.35
CENTER
PUNCH 2.8
DIRECTLY - -
BY 13 PERCENT 8.89 THROUGH 71 · 12
.35 PAPER
ALL
8.89
CYCLES SW1 SW2 SW3 HOLES
1 OFF OFF OFF SWITCH 4
.35 .25
2 OFF ON OFF OFF - CYCLE CRANK
3 ON OFF OFF 8.89 6.35
ON - SINGLE CRANK 1.3 DIA.
4 ON ON OFF

•
.65
5 OFF OFF ON 33.02
6 OFF ON ON 16.51
7 ON OFF ON INCH
8 ON ON ON
.3
MM
7.62
 AUTO
REMOTE
EXTRA
START

•
FAULT CONTACTS
OFF

EXPANSION
MANUAL

15 14 13 X1
FUEL RELAY LOW OIL PRESSURE LAMP

START RELAY HIGH WATER TEMP LAMP

6
HIGH WATER TEMP OVERCRANK LAMP
5 FOR
LOW OIL PRESS INFORMATION OVERSPEED LAMP
4 ON SETUP OF
TIE FAULT POTS AND
ENGINE STARTED LAMP
COMMONS TO 3 SWITCHES SEE
TERMINAL 13 ADJUSTMENTS
PAGE COMMON ALARM LAMP

MAG
1
PICKUP

5 1
EXTRA FAULT A EXTRA FAULT A LAMP
4 4
FEX3
EXTRA FAULT B EXTRA FAULT B LAMP
3

•
3 2

The FEX3 is shown expanding the control to 6 total engine faults. The FEX3 provides both the fault combining
signal circuits and the latch circuits. Placing voltage on terminal 7 will place unit in shutdown but it will not
latch. See FEX3 literature for more information.

MANUFACTURER'S
WARRANTY
Engineering Concepts Unlimited, Inc. warrants and
guarantees that its automatic engine starting controls are
free from any defects in workmanship and/or materials for
one (1) year from date of shipment from its factory, and if
they are found defective by the factory, they will be
replaced, F.O.B. Fishers, IN. This warranty does not cover
incidental and consequential damages, nor does this
warranty cover defects caused by misuse, faulty
installation, alteration, accident, or any labor charges,
service charges, or anything else except the replacement
of the product. THIS IS IN LIEU OF ANY OTHER
WARRANTIES, EXPRESSED OR IMPLIED.
ALL MATERIAL IN THIS MANUAL COPYRIGHT 1996
ENGINEERING CONCEPTS UNLIMITED INC. 8950
TECHNOLOGY DRIVE, FISHERS IN 46038
All Specifications are subject to change without notice
We are not responsible for typographical errors

•
®
ECU IS A REGISTERED TRADEMARK OF
ENGINEERING CONCEPTS UNLIMITED INC.