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 XC70FACTORY OEM SERVICE PROCEDURE
Component specifications
The component specification gives the value of the component when the connector is disconnected. Where no value is given, it is not possible to measure a relevant value at the component.
The value within the brackets indicates the terminal pin on the component to which the value refers.
| Designation | Type | Supply voltage | Value | Other |
| Air conditioning (A/C) relay | Mechanical relay | 12 V (#1 coil) | Approximately 96 Ω (terminals #1-#2) | - |
| A/C pressure sensor | Absolute manifold absolute pressure (MAP) sensor | 5 V (#3) | - | - |
| Stop lamp switch | Position switch | 12 V (#1) | The switch is closed when the pedal is depressed (terminals #1-#5) | - |
| Fuel pump (FP) relay | Mechanical relay | - | Approximately 96 Ω (terminals #1-#2) | The relay is controlled by the central electronic module (CEM) |
| Engine cooling fan (FC) control module | Electronic speed control module with integrated power stage | 12 V (terminal #A1) | - | - |
| Canister purge (CP) valve | Electromagnetic valve | 12 V (#1) | 20-22 Ω at 20°C (#1-#2) |
- |
| Accelerator pedal (AP) position sensor | Electronic pedal sensor with 2 output signals, PWM and a linear analog signal | 12 V (#1) 5 V (terminal #6) Power supply for the analog position sensor |
- | - |
| Throttle unit | Electronic throttle control module with two integrated potentiometers and a damper motor | 5 V (#3) | 1.2-3.5 Ω (terminals #1-#4 motor winding). 1000-1500 Ω (terminals #2-#3 Parallel connection of potentiometers 1 and 2). Approximately 820 Ω when the throttle is closed. Approximately 1580 Ω at wide open throttle (WOT) (terminal #2-#6 potentiometer 1). Approximately 1480 Ω when the throttle is closed. Approximately 500 Ω at wide open throttle (terminals #2-#5 potentiometer 2). |
- |
| Injector | Electromagnetic injector | 12 V (#1) | Approximately 12 Ω at 20°C (#1-#2) |
- |
| Camshaft sensor | Magnetic resistive sensor | 5 V (#1) | - | - |
| Knock sensor (KS) | Piezo electric component | - | Greater than 4 MΩ (applies to both knock sensors (KS)). (terminals #1-#2 front knock sensor (KS)) Greater than 4 MΩ (terminals #3-#4 rear knock sensor (KS)) |
Separate signal ground for the knock sensors (KS) |
| Clutch pedal sensor | Slide potentiometer | 5 V (#2) | Unaffected pedal: 1400-2400 Ω Fully depressed pedal: 200-800 Ω (#2-#4) |
- |
| Cooling fan for control modules | Fan motor | 12 V (#1) | - | The engine cooling fan (FC) is controlled by the engine control module (ECM) |
| Coolant level sensor | Position switch | Connected to ground (terminal #2) | Closed when the engine coolant level is normal | - |
| Boost pressure sensor | Absolute manifold absolute pressure (MAP) sensor | 5 V (#1) | - | - |
| Preheating, front heated oxygen sensor (HO2S) | PTC resistor | 12 V (#3) | 2.6-3.4 Ω at 20°C (#3-#4) |
- |
| Preheating, Heated oxygen sensor (HO2S) | PTC resistor | 12 V (#1) | Approximately 9 Ω at 20°C (terminal #1-#2) | - |
| Mass air flow (MAF) sensor | - | 12 V (#2) 5 V (#4) |
- | - |
| Air temperature sensor, intake | NTC resistor | 5 V (#4) | 1900-2100 Ω at 25°C (#1-#3) |
Built-in in the mass air flow (MAF) sensor |
| Intake air temperature (IAT) sensor, (turbocharged engines) | NTC resistor | 5 V (#1) | 15931 Ω at 0°C 9672 Ω at 10°C 6068 Ω at 20°C 3923 Ω 30°C (#1-#2) |
Applies to a separately installed sensor |
| Leak diagnostic unit | Consists of an air pump, electromagnetic valve and an internal heating element | 12 V (#4) |
Approximately 118 Ω (terminals #1-#4 pump motor winding) 27.9 -34.1 Ω (terminals #3-#4 Valve coil) |
- |
| Engine coolant temperature (ECT) sensor | NTC resistor | 5 V (#1) |
15040 Ω at -20°C 2450 Ω at 20°C 318 Ω at 80°C (#1- #2) |
- |
| PTC resistor air preheating | PTC resistor | 12 V (#1) | Approximately 10 Ω at 20°C | - |
| Oil pressure sensor | Pressure switch (Pressostat) | Grounded in the cylinder block | Closed switch when the oil pressure is low | - |
| Reset valve, camshaft | Electromagnetic valve | 12 V (#1) | 9.9 -11.1 Ω (#1-#2) | - |
| Flywheel sensor | Engine speed sensor | - | 108.5-142.5 Ω at 20°C (#1-#2) |
- |
| System relay | Mechanical relay | 12 V (#1 coil) | Approximately 80 Ω (terminals #1-#2) | - |
| Turbocharger (TC) control valve | Electromagnetic valve (3 way) | 12 V (#1) | 21.8-24.2 Ω at 20°C (terminals #1-#2) | |
| Outside temperature the sensor |
NTC resistor | 5 V (#1) | 18702 Ω at -20 °C 6318 Ω at 0°C 2424 Ω at 20°C 1034 Ω at 40°C (#1- #3) |
- |
Factory Service Tools
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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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