Volvo FH Workshop Manual. Wiring Diagram
Welcome to the Volvo FH Truck Electrical Wiring Diagrams Technical Guide. This section is a detailed guide to the electrical wiring system for mechanics, electricians and service technicians. Here you will find:
- Complete electrical wiring diagrams and components
- Description of engine management, lighting, ABS, air conditioning and other systems
- Information about connectors, wire colors and component locations
- Step-by-step instructions for diagnostics and troubleshooting
This manual will help you ensure accurate maintenance and repair of your Volvo FH electrical system, increasing the reliability and safety of your vehicle.
| Volvo FH/NH Lubrication service and oil changes, Service Bulletin | Download |
| Volvo FM, FH Driver’s Handbook 1998 | Download |
| Volvo Vehicle Management System / Fault Codes | Download |
| Volvo VE D12, D12A, D12B Engine Brake | Download |
Volvo FH/NH Gen.1 1993–2006 Wiring Diagram
| Volvo FH/NH General. Example of Wiring Diagram | Download |
| Volvo FH/NH Component wiring diagrams | Download |
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Volvo FH/NH Illustrations index |
Download |
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Volvo FH/NH Circuit card electrical centre |
Download |
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Volvo FH/NH Fuses & Relays on circuit card electrical centre
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Download |
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Volvo FH/NH Cable harness |
Download |
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Volvo FH/NH List of Connectors and Components |
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Volvo FH/NH Abbreviations |
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Volvo FH12, FH16 LHD 1993–2001 Wiring Diagram
| FH12, FH16 LHD General. Example of Wiring Diagram | Download |
| FH12, FH16 LHD Component Wiring Diagrams | Download |
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FH12, FH16 LHD Illustrations index |
Download |
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FH12, FH16 LHD Circuit card electrical centre |
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FH12, FH16 LHD Fuses & Relays on circuit card electrical centre
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Download |
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FH12, FH16 LHD Cable harness |
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FH12, FH16 LHD List of Connectors and Components |
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FH12, FH16 LHD Abbreviations |
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| FH12, FH16 LHD Cable colour code | Download |
Volvo FH, NH12 2006 Service Manual. Wiring Diagram
| Password for PDF: truckfixdiagn.com | |
| Volvo FH 2006 Example of Wiring Diagram | Download |
| Volvo FH 2006 Component Wiring Diagrams | Download |
| Volvo FH 2006 Illustrations index. Wiring harnes | Download |
| Volvo FH 2006 Fuses & Relays Diagram | Download |
| Volvo FH 2006 Wiring harness illustration index | Download |
| Volvo FH 2006 Ground connections List of ground connections | Download |
| Volvo FH 2006 List of connectors | Download |
| Volvo FH 2006 List of components | Download |
| Volvo FH 2006 Cable colour code | Download |
Volvo FH 2001-2008 Wiring Diagram
CHID A652195–, CHID B486535–, CHID E735697–, CHID CKD875563–
| FH, FM, NH12, Version2 Example of Wiring Diagram | Download |
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FH, FM, NH12, Version2 Component Wiring Diagrams |
Download |
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FH, FM, NH12, Version2 Illustrations index. Wiring harness |
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FH, FM, NH12, Version2 Fuses & Relays on circuit card electrical
centre |
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FH, FM, NH12, Version2 Cable harness |
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FH, FM, NH12, Version2 Ground Connections |
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| FH, FM, NH12, Version2 List of Connectors | Download |
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FH, FM, NH12, Version2 Abbreviations |
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FH, FM, NH12, Version2 Cable colour code |
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Volvo FH Typical Faults
🔧 Engine and fuel system
Clogged EGR (exhaust gas recirculation) system:
Symptoms: loss of power, smoke, environmental errors.
Cause: carbon deposits and contamination of valves.
Worn injectors (especially on D13 engines):
Signs: difficult starting, unstable engine operation, excessive fuel consumption.
Cause: low-quality fuel or high mileage.
Turbo problems:
Often associated with oil starvation or bearing wear.
Oil or antifreeze leaks:
Can be caused by aging gaskets, especially at high mileage.
⚙️ Transmission and clutch
I-Shift (automatic transmission):
Possible failures in electronic control, especially if the harnesses are damaged.
Clutch wear is a common problem after 600–800 thousand km.
Gear shift fork defects:
Sometimes "thoughtfulness" or failures during shifting are observed.
💡 Electronics
CAN bus glitches and control unit failures:
Can manifest themselves in the form of "circuit errors", inability to start.
Instrument panel problems:
Flickering, shutdown, errors due to oxidized contacts or voltage drops.
Batteries and charging:
Generator wear, especially after 700 thousand km; weak charging current.
🚛 Suspension, frame and brakes
Wear of jet rod bushings, shock absorbers:
Manifests itself in cabin rocking, vibration when driving.
Problems with air suspension:
Leaks in the lines, wear of the compressor or level sensors.
ABS/ESP errors:
Often caused by damage to the sensors on the hubs or wiring.
🛠 Other common faults
Leaking cabin heater (stove).
Rusting of the exhaust system, especially at the connections.
Wear of the cabin silent blocks, especially the rear