Isuzu N-Series. Manual - part 638

ENGINE ELECTRICAL 6D-45

Charge Relay
Inspect the continuity

If apply the battery voltage to terminal between 2 — 4

3 — 5

Continuity

1 — 5

No Continuity

3 — 5

No Continuity

1 — 5

Continuity

N6A3734E

N6A3735E

EXHAUST GAS RECIRCULATION (EGR) SYSTEM 6E-1

ENGINE 4J SERIES

SECTION 6E

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

Contents

GENERAL DESCRIPTION ................................... 6E-2
EGR SYSTEM WIRING DIAGRAM ...................... 6E-4
EGR SYSTEM OPERATION ................................ 6E-5
INSPECTION ........................................................ 6E-6
EGR COOLER ...................................................... 6E-7

Component ........................................................ 6E-7
Removal ............................................................ 6E-7
Installation ......................................................... 6E-8

6E-2 EXHAUST GAS RECIRCULATION (EGR) SYSTEM

GENERAL DESCRIPTION

4JB1-TC

This system controls the formation of NOx emission by recirculating the exhaust gas into the combustion chamber
through the intake manifold.
The EGR valve are controlled by VSV, also VSV are controlled by EGR controller according to signals from RPM sen-
sor and Potentiometer.
The amount of EGR depends on the number of engine rotations and the opening of the accelerator.

Legend

1. EGR valve

5. Vacuum pump

2. Potentiometer

6. V.S.V

3. Thermo switch

7. EGR controller

4. Injection pump

8. RPM sensor

N6A3578E

EXHAUST GAS RECIRCULATION (EGR) SYSTEM 6E-3

4JH1-TC

The 4JH1-TC engine is equipped with the EGR cooler. The cooler reduces the temperature of the air being drawn
into the engine and the combustion temperatures. This results in reducing nitrogen oxide (NOx) emissions.

Legend

1. Intake manifold

6. Exhaust manifold

2. Oil pan

7. Wast gate

3. Inter cooler

8. Fresh air

4. EGR valve

9. Turbocharger

5. EGR cooler

10. Exhaust gas

N6A3579E