Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 12

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–43

45

45

Data Link Connector 
(No. 6)

BLU

Less than 1V

Battery voltage

Connect

DC V

45

GND

46

46

No Connection

BRN/RED

-

-

-

-

-

-

-

-

47

47

No Connection

-

-

-

-

-

-

-

-

-

48

48

No Connection

-

-

-

-

-

-

-

-

-

49

49

Throttle Position 
Sensor (TPS) Ground

RED/GRN

Idle: Approx. 

0.4k

Ω/ 

WOT: Approx. 

3.8k

Ω

-

-

-

Disconnect

Ω

38

49

50

50

No Connection

-

-

-

-

-

-

-

-

-

51

51

No Connection

-

-

-

-

-

-

-

-

-

52

52

No Connection

-

-

-

-

-

-

-

-

-

53

53

No Connection

-

-

-

-

-

-

-

-

-

54

54

No Connection

-

-

-

-

-

-

-

-

-

55

55

No Connection

-

-

-

-

-

-

-

-

-

56

56

No Connection

-

-

-

-

-

-

-

-

-

57

57

Throttle Position 
Sensor (TPS) Power 
Supply

BLK/GRN

Less than 1V

Approx. 5V

Connect

DC V

57

49

58

58

ECM Main Relay

BLU/BLK

Battery 
voltage

Less than 1V 

Connect

DC V

58

GND

59

59

No Connection

-

-

-

-

-

-

-

-

-

60

60

No Connection

-

-

-

-

-

-

-

-

-

61

61

No Connection

-

-

-

-

-

-

-

-

-

62

62

No Connection

-

-

-

-

-

-

-

-

-

63

63

ECM Power Supply

BLU/RED

Less than 1V

Battery voltage

Connect

DC V

63

GND

64

64

No Connection

-

-

-

-

-

-

-

-

-

65

65

Brake Switch 2 Signal

WHT/BLK

Less than 1V

Battery voltage when pedal is not 

stepped on

Connect

DC V

65

GND

66

66

No Connection

-

-

-

-

-

-

-

-

-

67

67

No Connection

-

-

-

-

-

-

-

-

-

68

68

Vehicle Speed Sensor 
(VSS) Via Speed Meter

BLU/WHT

-

Approx. 15Hz by wave form or 

approx. 6.4V at vehicle speed 20km/

h

Connect

AC V

68

GND

69

69

Idle Switch

GRN/BLK

Less than 1V

Approx. 5V when pedal is stepped on

Connect

DC V

69

GND

70

70

No Connection

-

-

-

-

-

-

-

-

-

71

71

No Connection

-

-

-

-

-

-

-

-

-

72

72

No Connection

-

-

-

-

-

-

-

-

-

73

73

No Connection

-

-

-

-

-

-

-

-

-

74

74

No Connection

-

-

-

-

-

-

-

-

-

75

75

No Connection

-

-

-

-

-

-

-

-

-

76

76

No Connection

-

-

-

-

-

-

-

-

-

77

77

No Connection

-

-

-

-

-

-

-

-

-

78

78

No Connection

-

-

-

-

-

-

-

-

-

79

79

No Connection

-

-

-

-

-

-

-

-

-

80

80

No Connection

-

-

-

-

-

-

-

-

-

81

81

No Connection

-

-

-

-

-

-

-

-

-

82

82

No Connection

-

-

-

-

-

-

-

-

-

83

83

Mass Air Flow (MAF) 
Sensor  Power Supply

WHT/RED

Less than 1V

Approx. 5V

Connect

DC V

83

92

84

84

Intake Air Temperature 
(IAT) Sensor Signal

BLK/BLU

Less than 1V

Approx. 2.5V at IAT 25°C

Connect

DC V

84

92

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–44

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

85

85

No Connection

-

-

-

-

-

-

-

-

-

86

86

No Connection

-

-

-

-

-

-

-

-

-

87

87

Neutral Switch

BLK/WHT

Less than 1V

Battery voltage at other than neutral 
(MT) / Battery voltage in P or N (AT)

Connect

DC V

87

GND

88

88

Mass Air Flow (MAF) 
Sensor Signal

GRN/RED

Less than 1V

Approx. 1V  Approx. 2V Approx. 3V

Connect

DC V

88

92

89

89

Engine Coolant 
Temperature (ECT) 
Sensor Signal

GRY

Less than 1V

Approx. 1.3V at ECT 80°C

Connect

DC V

89

93

90

90

TDC Sensor Signal

RED

-

-

Approx. 

47Hz by 

wave form 

or approx. 

0.7V at 

700rpm

Approx. 

133Hz by 

wave form 

or approx. 

1.0V

Connect

AC V

90

98

91

91

TDC Sensor Output To 
Pump Control Unit 
(PSG) No.8

PNK

-

-

Approx. 

47Hz by 

wave form

Approx. 

133Hz by 

wave form

-

-

-

-

92

92

Mass Air Flow (MAF) 
Sensor Ground

BLK/RED

Continuity 

with ground

-

-

-

Connect

Ω

92

GND

93

93

Engine Coolant 
Temperature (ECT) 
Sensor Ground

BLK/PNK

Continuity 

with ground

-

-

-

Connect

Ω

93

GND

94

94

Glow Relay

BLK/BLU

Less than 1V

Battery voltage when glow system is 

not activated

Connect

DC V

94

GND

95

95

No Connection

-

-

-

-

-

-

-

-

-

96

96

No Connection

-

-

-

-

-

-

-

-

-

97

97

EGR EVRV

BLK/ORG

-

Approx. 140Hz by wave 

form when EVRV is 

activated

-

-

-

-

98

98

TDC Sensor Ground

WHT

Continuity 

with ground

-

-

-

Connect

Ω

98

GND

99

99

CAN (Controller Area 
Network) to PSG No.1

RED

-

-

-

-

-

-

-

-

100

100

CAN (Controller Area 
Network) to PSG No.2

WHT

-

-

-

-

-

-

-

-

101

101

TDC Sensor Shield 
Line

-

Continuity 

with ground

-

-

-

Connect

Ω

101

GND

102

102

No Connection

-

-

-

-

-

-

-

-

-

103

103

No Connection

-

-

-

-

-

-

-

-

-

104

104

No Connection

-

-

-

-

-

-

-

-

-

105

105

Solenoid Valve Shut 
Off (MAB) Output 
Signal to PSG No.5

ORG 

-

Wave form  

-

-

-

-

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

(+)

(-)

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–45

PSG CONNECTOR PIN ASSIGNMENT & OUTPUT SIGNAL (4JH1-TC)

View Looking Into PSG Case

Pin 
No. 

B/Box 

No.

Pin Function

Wire 

Color

Signal or Continuity

PSG 

Connection

Tester Position

Key SW Off

Key SW 

On

Engine 

Idle

Engine 

2000rpm

Range

(+)

(-)

1

99

CAN (Controller Area 
Network) to ECM 
No.99

RED

Continuity 

between 

ECM & PSG

-

-

-

Disconnect

Ω

1

99

2

100

CAN (Controller Area 
Network) to ECM 
No.100

WHT

Continuity 

between 

ECM & PSG

-

-

-

Disconnect

Ω

2

100

3

-

No Connection

-

-

-

-

-

-

-

-

-

4

-

No Connection

-

-

-

-

-

-

-

-

-

5

105

Solenoid Valve Shut 
Off (MAB) Output 
Signal to ECM No.105

ORG Continuity 

between 

ECM & PSG

-

-

-

Disconnect

Ω

5

105

6

-

Ground

BLK

Continuity 

with ground

-

-

-

Disconnect

Ω

6

GN

D

7

3

Battery Power Supply

BLU/RED

Continuity 

between 

ECM & PSG

-

-

-

Disconnect

Ω

7

3

8

91

TDC Sensor Output 
ECM No.91 To Pump 
Control Unit (PSG)

PNK

Continuity 

between 

ECM & PSG

-

-

-

Disconnect

Ω

8

91

9

-

No Connection

-

-

-

-

-

-

-

-

-

6E–46

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

GENERAL DESCRIPTION FOR ECM AND 

SENSORS

Engine Control Module (ECM)

The engine control module (ECM) is located on the
transmission tunnel.
The fuel quantity and injection timing related functions
are controlled by the pump control unit (PSG).
The engine control module (ECM) performs the
following functions.

• Control of the exhaust gas re-circulation (EGR)

• Control of the quick on start (QOS) glow control

system

• Control of the A/C compressor

• Execution of the immobiliser function

Pump Control Unit (PSG) & Data Exchange 
Between Control Module

The radial plunger distributor type injection pump uses
two control modules to execute full control of the engine

management system.

• Engine Control Module (ECM)

• Pump Control Unit (PSG) = Pumpen Steuer Great

(German)

The pump control unit (PSG) receives signals from the
sensors inside the pump to determine the cam ring
rotation angle, the pump speed and the fuel
temperature .
These values are then compared to the desired values
sent by the engine control module (ECM) such as the
desired injection timing and the desired fuel injection
quantity.
The engine control module (ECM) processes all engine
data and data regarding the surrounding environment
received from external sensors to perform any engine
side adjustments. 
Maps for both are encoded in both control units. The
control units input circuit process sensor data.
A Microprocessor then determines the operating
conditions and calculates set values for optimum
running.
The interchange of data between the engine control
module (ECM) and the pump control unit (PSG) is
perfumed via a CAN-bus system. The abbreviation CAN
stands for Controller Area Network. By having two
separate control modules, the high pressure solenoid
valve. This prevents the discharge of any disturbing
signals.

The following signals are exchanged via the CAN-bus:
From ECM to PSG

• Desired injection quantity

• Desired injection timing

• Engine speed

From PSG to ECM

• Fuel temperature

• Pump speed

• Cylinder identifier

• Control pulse (actual injection quantity + actual

injection timing)

• PSG status

                   Self Diagnosis / Interface / Signal

                                                                           To High Pressure Solenoid

                Engine Speed

                                                                                            Injection Timing

          Accelerator Pedal

                                                                                          Injection Quantity

Intake Air Temperature

                                                                                          Response Signal

                Mass Air Flow

                                              Additional Signal

                              Others

                                                                                                                       

                                                  Additional Operations                                                To Timing Control Valve (TCV)

Engine

Control
Module

(ECM

   Cam Ring Rotational Angle
   Fuel Temperature

                                  High Pressure
                                  Solenoid Valve
 Pump
  Control                Fuel Injection
  Unit                      (Mechanical)
 (PSG

                Timing Device