Description - engine management (ENGINE MANAGEMENT SYSTEM - V8) (page 4 of 43)

ENGINE MANAGEMENT SYSTEM - V8

DESCRIPTION AND OPERATION

18-2-9

Pin out details connector C0634

Connector 2 (C0635): This connector contains 24 pins and is primarily used for Heated Oxygen Sensors (HO

2

S) 

control and earth. The HO

2

S sensors require a heater circuit to assist in heating the tip of the sensors to enable closed 

loop fuelling to be implemented quickly after cold starting.

Pin out details connector C0635

Pin No.

Function

Signal type

Reading

1

Ignition position II

Input

12 V

2

Not used

-

-

3

Not used

-

-

4

Chassis earth

Earth

0V

5

Fuel injectors earth

Earth

0V

6

Power stage earth

Earth

0V

7

Permanent battery supply

Input battery supply

12V

8

Switched relay  positive

Input switched

0-12V

9

Not used

-

-

Pin No.

Function

Signal type

Reading

1

HO

2

S heater RH bank - downstream

Output

PWM 12-0V

2

Not used

-

-

3

Not used

-

-

4

Not used

-

-

5

Thermostat monitoring sensor

Earth

0V

6

Not used

-

-

7

HO

2

S heater LH bank - downstream

Output

PWM 12-0V

8

HO

2

S sensor RH bank - downstream

Earth/ Signal

0V

9

HO

2

S sensor LH bank - upstream

Earth/ Signal

0V

10

HO

2

S sensor RH bank - upstream

Earth/ Signal

0V

11

HO

2

S sensor LH bank - downstream

Earth/ Signal

0V

12

Not used

-

-

13

HO

2

S heater RH bank - upstream

Output

PWM 12-0V

14

HO

2

S sensor RH bank - downstream

Input/ Signal

Analogue 0-5V

15

HO

2

S sensor LH bank - upstream

Input/ Signal

Analogue 0-5V

16

HO

2

S sensor RH bank - upstream

Input/ Signal

Analogue 0-5V

17

HO

2

S sensor LH bank - downstream

Input/ Signal

Analogue 0-5V

18

Fuel pump relay

Output

Switch to earth

19

HO

2

S heater LH bank - upstream

Output

PWM 12-0V

20

Not used

-

-

21

Thermostat monitoring sensor

Signal

Analogue 0-5V

22

Not used

-

-

23

Main relay

Output

Switch to earth

24

EVAP system leak detection pump motor (NAS 
vehicles with positive pressure type, EVAP system 
leak detection capability only)

Output

Switch to earth