Isuzu N-Series. Service manual - part 457

6E-164 EMISSION AND ELECTRICAL DIAGNOSIS

Auxiliary Engine Control System (Equipped with Exhaust gas recirculation (EGR))

N6A1308E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-165

Vacuum Switching Valve (VSV) Circuit (Equipped with Exhaust gas recirculation (EGR))

Legend

1. Intake throttle chamber

5. Vacuum Switching Valve

2. Vacuum hose

6. Vacuum source

3. Intake throttle valve

7. EGR valve

4. FICD valve

N6A1309E

6E-166 EMISSION AND ELECTRICAL DIAGNOSIS

Exhaust Brake Control

Legend

1. Batteries

13. Magnetic valve: Exhaust brake

2. Fusible link wire

14. Vacuum pump

3. Charge relay

15. Vacuum tank

4. Fuse

16. Vacuum chamber: Exhaust brake

5. Exhaust brake relay

17. Exhaust brake valve

6. Exhaust brake switch

18. Key switch

7. Indicator light

19. Vacuum chamber: Intake throttle

8. Diode

20. Intake throttle

9. Exhaust brake control relay

21. Magnetic valve intake throttle

10. Neutral switch

22. Generator (L)

11. Clutch switch

23. Starter relay coil

12. Accelerator switch

N6A1310E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-167

DTC-13 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Appearance of Water Temperature Sensor and
Connector Pin Assignment

Temperature Sensor

Connector Pin Assignment

N6A1311E

Legend

1. 3 pin connector
2. Engine coolant temperature sensor

N6A1160E

Legend

1. To ECT sensor
2. 3 pin gray

N6A1161E