Introduction to the Service Manual
This service manual provides detailed information for Volvo Trucks, specifically models VN, VHD VERSION2, and VT, focusing on MID 128 fault codes related to 2007 emissions. It is designed for service technicians and outlines diagnostic procedures and system overviews.
Key Systems and Components
The manual covers the Engine Control System, including the Engine Management System (EMS) Module, Instrument Cluster Module (ICM), Vehicle Electronic Control Unit (VECU), Transmission Electronic Control Unit (TECU), and Gear Selector Electronic Control Unit (GSECU). These modules communicate via J1939 and J1587 serial data lines to manage various engine and vehicle functions.
Diagnostic capabilities are integrated into these modules to detect and log faults. When a fault is detected, the operator is alerted via a malfunction indicator lamp and a message on the driver information display. The system may enter a 'limp home' mode to allow continued operation, potentially with reduced performance.
Diagnostic Tools and Procedures
The 'Premium Tech Tool' (PTT) is the recommended tool for diagnostic work. For further information or to obtain the tool, contact a local Volvo dealer or visit www.premiumtechtool.com.
The manual details various sensors critical to engine management, including:
- Ambient Air Temperature Sensor
- Crankshaft Position Sensor
- Engine Coolant Temperature Sensor
- Intake Manifold Pressure Sensor
- Throttle Position Sensor
- Turbo Speed Sensor
Each sensor's function, location, and operational principles are explained to aid in troubleshooting and repair.
Important Safety Information
The manual emphasizes safety procedures, using distinct levels of warnings: Note, Caution, Warning, and Danger, to highlight potential hazards and necessary precautions during service operations.
