Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Volvo V40 BaseFACTORY OEM SERVICE PROCEDURE
Engine compartment
| Component | Location | |
|---|---|---|
| 1 | Turbo control valve (TCV) | On the rear side of the air filter cover |
| 2 | Engine speed sensor (RPM) | On the engine, on the flywheel side |
| 3 | Throttle position sensor (TP) | On the throttle housing |
| 4 | EVAP purge valve | The electrical valve is situated on the coolant radiator |
| 5 | A/C linear pressure sensor | In the A/C dryer |
| 6 | Engine coolant fan (FC) | The left fan behind the radiator |
| 7 | Condenser fan | The right fan (small) behind the radiator |
| 8 | Intake air temperature sensor (IAT) | On the cold intercooler side. Underneath the connecting pipe to the inlet manifold |
| 9 | Manifold absolute pressure sensor (MAP) | Located on the inlet manifold between cylinder 3 and 4 |
| 10 | Engine coolant temperature sensor (ECT) | Central coolant temperature sensor. The EMS 2000 communicates the temperature to the instrument as well |
| 11 | Knock sensor (KC) | On the front side of the engine between cylinders 2 and 3 |
| 12 | Idle air control valve (IAC) | On the inlet manifold |
| 13 | PCV heating | The crankcase ventilation heating is on the hose, near the turbo compressor |
| 14 | Ignition coil | Cylinders 2 and 3 |
| 15 | Ignition coil | Cylinders 1 and 4 |
| 16 | VVT valve | Mounted on the cylinder head. Regulates the exhaust camshaft |
| 17 | Camshaft position sensor (CMP) | On the exhaust camshaft |
| 18 | Altitude sensor | On the bracket, with the connectors underneath the cover |
| 19 | Mass airflow sensor (MAF) | Outlet air filter |
| 20 | Relay A/C compressor | In relay box |
| 21 | Relay coolant fan (FC) speed 2 | In relay box |
| 22 | System relay | In relay box |
| 23 | Relay condenser fan | In relay box |
| 24 | Relay FC speed 1 | In relay box |
| 25 | EVAP canister | Located on the fuel tank |
| 26 | LDP pump | Located on the member to the rear |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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