Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 199

ENGINE DRIVEABILITY AND EMISSIONS

6E–37

J1-20

20

No Connection

-

-

-

-

-

-

-

-

-

J1-21

21

Crankshaft Position
(CKP) Sensor Signal

WHT -

-

Wave

form or

approx.

3.7V

Wave

form or

approx.

7.7V

Connect

AC V

21

6

J1-22

22

No.2 Injector

BLU/BLK

Less than

1V

Battery
voltage

Wave form

Connect

DC V

22

GND

J1-23

23

No Connection

-

-

-

-

-

-

-

-

-

J1-24

24

MAP Sensor Signal

GRY/RED

Less than

1V

Approx.

4.8V

Approx.

1.3V

Approx.

0.9V

Connect

DC V

24

16

J1-25

25

No Connection

-

-

-

-

-

-

-

-

-

J1-26

26

No Connection

-

-

-

-

-

-

-

-

-

J1-27

27

Engine Coolant Temp.
(ECT) Sensor Signal

GRY

Less than

1V

Approx. 2.5V at ECT 80°C

Connect

DC V

27

32

J1-28

28

Idle Air Control Valve
(IACV) Coil A High

YEL/BLK

Less than

1V

Less than 1V / Battery voltage

Connect

DC V

28

GND

J1-29

29

Idle Air Control Valve
(IACV) Coil B Low

YEL/GRN

Less than

1V

Less than 1V / Battery voltage

Connect

DC V

29

GND

J1-30

30

Idle Air Control Valve
(IACV) Coil A Low

BLU/WHT

Less than

1V

Less than 1V / Battery voltage

Connect

DC V

30

GND

J1-31

31

MAP Sensor Power
Supply

YEL/RED

Less than

1V

Approx.. 5V

Connect

DC V

31

16

J1-32

32

ECT Sensor, Knock
Sensor, Throttle
Position Sensor
Ground

BLU/PNK

Continuity

with

ground

-

-

-

Connect

Ω

32

GND

Pin
No.

B/Box

No.

Pin Function

Wire

Color

Signal or Continuity

ECM

Connection

Tester Position

Key SW

Off

Key SW

On

Engine

Idle

Engine

2000rpm

Range

(+)

(-)

6E–38

ENGINE DRIVEABILITY AND EMISSIONS

Connector J2 Port: View Looking Into ECM Case

1

17

16

32

PIN32

PIN1

PIN17

PIN16

Pin
No.

B/Box

No.

Pin Function

Wire

Color

Signal or Continuity

ECM

Connection

Tester Position

Key SW

Off

Key SW

On

Engine

Idle

Engine

2000rpm

Range

(+)

(-)

J2-1

33

Intake Air Temp. (IAT)
Sensor Ground

GRN

Continuity

with

ground

-

-

-

Disconnect

Ω

33

GND

J2-2

34

Battery Power Supply

RED/

WHT

Battery voltage

Connect

DC V

34

GND

J2-3

35

Ignition Power Supply

BLU/YEL

Less than

1V

Battery voltage

Connect

DC V

35

GND

J2-4

36

To Data Link
Connector No. 6

BLU Less

than

1V

Approx. 5V

Connect

DC V

36

GND

J2-5

37

No Connection

-

-

-

-

-

-

-

-

-

J2-6

38

Oxygen Sensor
(Ground)

PNK

Continuity

with

ground

-

-

-

Connect

Ω

38

GND

J2-7

39

No Connection

-

-

-

-

-

-

-

-

-

J2-8

40

No Connection

-

-

-

-

-

-

-

-

-

J2-9

41

No Connection

-

-

-

-

-

-

-

-

-

J2-10

42

No Connection

-

-

-

-

-

-

-

-

-

J2-11

43

Fuel Pump Relay

GRN/

WHT

Less than

1V

Less than

1V /

Battery
voltage

while fuel

pump is

activated

Battery voltage

Connect

DC V

43

GND

J2-12

44

No Connection

-

-

-

-

-

-

-

-

-

J2-13

45

A/C Compressor
Relay

GRY/RED

Less than

1V

Battery
voltage

Less than 1V

Connect

DC V

45

GND

J2-14

46

No Connection

-

-

-

-

-

-

-

-

-

J2-15

47

No Connection

-

-

-

-

-

-

-

-

-

J2-16

48

No Connection

-

-

-

-

-

-

-

-

-

J2-17

49

No Connection

-

-

-

-

-

-

-

-

-

J2-18

50

Battery Power Supply

RED/

WHT

Battery voltage

Connect

DC V

50

GND

J2-19

51

No Connection

-

-

-

-

-

-

-

-

-

J2-20

52

Power Steering
Pressure Switch

GRN/YEL

Less than

1V

Less than 1V when switch is turned

on / Battery voltage when switch is

turned off

Connect

DC V

52

GND

J2-21

53

Oxygen Sensor

BLU

Less than

1V

Approx.

0.4V

0.1 - 0.9V

Connect

DC V

53

38

J2-22

54

Intake Air Temp. (IAT)
Sensor (Signal)

YEL/GRN

Less than

1V

Approx. 1.8V at IAT 30°C

Connect

DC V

54

33

ENGINE DRIVEABILITY AND EMISSIONS

6E–39

J2-23

55

Vehicle Speed Signal
(Immobiliser Control
Unit Terminal B8)

WHT

-

-

Approx. 16Hz by wave

form or approx. 4.8V at

20km/h

Connect

AC V

55

GND

J2-24

56

No Connection

-

-

-

-

-

-

-

-

-

J2-25

57

Tachometer Output
Signal

BLK/RED

-

Wave form

-

-

-

-

J2-26

58

Thermo Relay

GRN/BLK

Less than

1V

Battery voltage when A/C request is

activated

Connect

DC V

58

GND

J2-27

59

No Connection

-

-

-

-

-

-

-

-

-

J2-28

60

No Connection

-

-

-

-

-

-

-

-

-

J2-29

61

No Connection

-

-

-

-

-

-

-

-

-

J2-30

62

To Data Link
Connector No. 2

GRN

-

-

-

-

-

-

-

-

J2-31

63

Oxygen Sensor Heater

BLU/WHT

Continuity

with

ground

-

-

-

Connect

Ω

63

GND

J2-32

64

Check Engine Lamp
(Immobiliser Control
Unit Terminal B7)

BRN/YEL

Less than

1V

Less than

1V

Battery voltage while

lamp is turned off

Connect

DC V

64

GND

Pin
No.

B/Box

No.

Pin Function

Wire

Color

Signal or Continuity

ECM

Connection

Tester Position

Key SW

Off

Key SW

On

Engine

Idle

Engine

2000rpm

Range

(+)

(-)

6E–40

ENGINE DRIVEABILITY AND EMISSIONS

GENERAL DESCRIPTION FOR ECM AND

SENSORS

Engine Control Module (ECM)

The engine control module (ECM) is located on the
intake manifold. The ECM controls the following.
• Fuel metering system

• Ignition timing

• On-board diagnostics for electrical functions.

The ECM constantly observes the information from vari-
ous sensors. The ECM controls the systems that affect
vehicle performance. And it performs the diagnostic
function of the system.
The function can recognize operational problems, and
warn to the driver through the check engine lamp, and
store diagnostic trouble code (DTC). DTCs identify the
problem areas to aid the technician in marking repairs.

The input / output devices in the ECM include analog to
digital converts, signal buffers, counters and drivers.
The ECM controls most components with electronic
switches which complete a ground circuit when turned
on.

Inputs (Operating condition read):
• Battery voltage

• Electrical ignition

• Exhaust oxygen content

• Intake manifold pressure

• Intake air temperature

• Engine coolant temperature

• Crankshaft position

• Knock signal

• Throttle position

• Vehicle speed

• Power steering pressure

• Air conditioning request on or off

Outputs (Systems controlled):
• Ignition control

• Fuel control

• Idle air control

• Fuel pump

• EVAP canister purge

• Air conditioning

• Diagnostics functions

Manifold Absolute Pressure (MAP) Sensor

The MAP sensor is a strain gage. A pressure strains the
resistance on the silicon base. At that time the
resistance value changes. And it changes voltage. In
other words it measures a pressure value. It is installed
to the intake manifold. Output voltage of the MAP
sensor is low as pressure is low.

(1) J1 Port
(2) J2 Port

1

2

Output V

oltage

(V)

0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

10

20

30

5

15

25

35

45

40

50 55

Pressure (KPa)

Characteristic of MAP Sensor (Reference)

60 65

75

70

85

80

90 95 100