Navistar T444 Electronic Diagnostic Manual 1997-2003

Model Years:

Engine serial numbers:

Coverage Includes:

Section 1  Engine Control System Overview

• Fuel Supply System
• Injection Control Pressure System
• HEUI Injector Operation
• Exhaust Back Pressure Device
• Electronic Control Module
• Sensor Operation
• Vehicle Features
• Diagnostic Software Self-test Operation

Section 2 Mechanical Diagnostics

• Diagnostic Forms
• Hard Start / No Start Diagnostics
• Performance Diagnostics
• Performance Specifications

Section 3 Electronic Control System Diagnostics

• Electronic Control System Diagnostic Form
• Flash Code Circuit Index
• Sensor and Actuator Locations
• Sensor and Actuator Diagnostic Procedures
• Circuit Function and Diagnostics

1. Accelerator Pedal Position Sensor / Idle Validation Switch
2. ATA Communications
3. Barometric Pressure Sensor
4. Brake Switch Circuits
5. Camshaft Position Sensor
6. Change Oil Lamp
7. Exhaust Bach Pressure Sensor
8. Engine Crank Inhibit
9. Engine Coolant Level System for Engine Protection
10. Electronic Control Module Self Diagnostics
11. Electronic Control Module Power Supply
12. Engine Coolant Temperature Sensor
13. Engine Data Line Circuits w/ Allison AT/MT Transmissions
14. Engine Fan Control 15. Engine Oil Pressure Sensor
15. Engine Oil Temperature Sensor
16. Exhaust Back Pressure Regulator
17. Glow Plug Control
18. Hydraulic Pressure Governor
19. Intake Air Temperature Sensor
20. Injection Control Pressure Sensor
21. Injector Drive Circuits
22. Injection Pressure Regulator 2
23. Injection Pressure Regulation System
24. Idle Shut-Down Timer
25. Manifold Absolute Pressure Sensor
26. Oil Water Lamp / Engine Warning & Protection
27. Remote Accelerator Pedal Sensor
28. Remote PTO Controls
29. Radiator Shutter Enable
30. Speed Control Command Switches and PTO Controls
31. Self Test Input Switch and Engine Warning Light
32. Tachometer Input Circuits
33. Two Speed Axle Circuit
34. Voltage Reference Circuit
35. Vehicle Retarder
36. Vehicle Speed Signal

1997-2003 Navistar T444 Electronic Diagnostic Manual