SM4 ECU

Pin Name

Pin Number

I / O

Main function / Characteristic

Alternate function / Characteristic

Usage Limits / Characteristic

Injector 1

17

Output

Injector control with Group 1-4 selectable Peak/Hold

current (High = 4Amp/1Amp)

or (Low = 2Amp/0.5Amp) ¹

Nil

Injector 2

32

Output

Outputs with same current as Injector group

Outputs are ON/OFF or 10Hz only PWM functions. (Other PWM frequencies not allowed).

Switch inputs are switch to Ground type

Injector 3

31

Output

Injector 4

16

Output

Injector 5

4

Output

Injector control with Group 5-8 selectable Peak/Hold

current (High = 4Amp/1Amp)

or (Low = 2Amp/0.5Amp) ¹

Injector 6

/ Switch 1

18

Output

or Input

Switch Inputs with ECU internal Pull-up resistor,

(SW1 - 700Hz max, SW2/3 - 200Hz max frequencies) or,

Outputs with same current as Injector group

Injector 7

/ Switch 2

3

Output

or Input

Injector 8

/ Switch 3

2

Output

or Input

Ignition 1

5

Output

Ignition trigger control,

Push / Pull driver, 0.8A cont.

(1A peak) per Ignition

Nil

Ignition 2

6

Output

Outputs with Push / Pull driver, 0.8A cont. (1A peak) per Output

Only 10Hz PWM or ON/OFF functions

Ignition 3

19

Output

Ignition 4

33

Output

Output 1

7

Output

Stepper motor (4 or 6 wire), Push / Pull driver, 0.8A cont. (1A peak) per Output

Output with Push / Pull driver, 0.8A cont. (1A peak) per Output

Outputs are ON/OFF, 10-500Hz PWM or H-Bridge.

Multi-Select 10-500Hz PWM outputs & parallel connect the O/P pins to increase drive current

Output 2

34

Output

Output 3

20

Output

Output 4

35

Output

Output 5

27

Output

Open-collector, 2.5 Amp per Output. Constant or Switched power supply

Output 6

13

Output

Output 7

42

Output

Open-collector, 3.5 Amp

Output 8

12

Output

Tacho, Open-collector, 1A

Constant or Switched supply

PWM 1

28

Output

Open-collector 9.5-1220 Hz PWM, 5A cont. (6A peak)

PWM 2

14

Output

Open-collector 9.5-1220 Hz PWM, 3.5Amp cont. (5A peak)

HSI 1

10

Input

Speed inputs or Camshaft position inputs

Switch or Digital Airflow

7 kHz max

HSI 2

24

Input

Switch or Digital Flex fuel

HSI 3

39

Input

Speed input³

Switch³

2.2 kHz max³

Analog 1

8

Input

Spare temp / pressure

Temperature / Pressure,

Control potentiometers,

High-side switches

2 wire sensors require Pull-up resistor

Analog 2

38

Input

External MAP / BARO

O2

37

Input

Air fuel ratio input

TPS

21

Input

Throttle position input

Nil

Linear, voltage rising with TPS opening

Air intake temperature

23

Input

Air intake temperature

Nil

Autronic & most NTC & PTC sensors

Coolant temperature

9

Input

Coolant temperature

Nil

Most NTC or PTC sensors

Sync

26

+ve Input

Sync input (Hall / Reluctor)

Speed input

7 kHz max

Scope function

41

-ve Input ²

Cylinder

25

+ve Input

Hall or Reluctor sensor, Generic and OEM trigger patterns

40

-ve Input ²

+5v sensor supply

36

Supply output

Supply for TPS and other sensors

Nil

45 mA max

+8v trigger supply

11

Supply output

Supply for Hall & other sensors

Nil

30 mA max

Signal Gnd

22

Input

Sensor Ground

Nil

Do not connect to engine block or vehicle ground

Ign Switch I/P

1

Supply Input

Ignition “on” power supply

Nil

< 100mA

+12v SUPPLY

15

Supply Input

Main Power supply ⁴

Nil

Current drain is application dependant

+12v RAM supply

30

Continuous power input

Keep alive memory supply

Nil

< 1mA

Gnd

29

Supply gnd

Power supply ground

Nil

12-Oct-2016