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.
Component Specification (2007)
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 number to the right of the voltage value indicates the terminal pin on the component to which the value refers.
| Designation | Type | Supply Voltage | Value | Miscellaneous |
| Air conditioning (A/C) relay | Mechanical relay | 12V (#1) | Approximately 70 Ω (coil) | |
| A/C pressure sensor | Absolute pressure sensor | 5 V (#3) | - | |
| Air conditioning (A/C) pressure switch | Pressure switch (Pressostat) | 12 V (#2) | 0 Ω at air conditioning (A/C) off | - |
| Stop lamp switch | Position switch | 12 V (#1) | The switch is closed when the pedal is depressed (#1-#2) | |
| Fuel temperature sensor | NTC resistor | 5V (#3) | 2500Ω at 20° (#1-#2) |
Integrated in the fuel pressure sensor |
| Fuel pressure sensor | Piezo resistive pressure sensor | 5V (#3) | - | |
| Evaporative emission system (EVAP) valve | Electromagnetic valve | 12 V (#1) | 17-24 Ω at 20°C (#1-#2) | |
| Accelerator pedal (AP) position sensor | Electronic pedal sensor with two output signals, PWM and a linear analog signal | 12 V (#1) 5 V (#6) | - | |
| Throttle unit | Electronic throttle control module with two integrated potentiometers and a damper motor | Potentiometers: 5 V (#3) | - |
- |
| Fuel injector | Electromagnetic injector valve | 12 V (#1) | Ca 12 Ω at 20°C (#1-#2) | |
| Camshaft sensor | Magneto-resistive sensor | 5 V (#1) | - | |
| Knock sensor (KS) | Piezo electric component | - | - | Separate signal ground for the knock sensor (KS) |
| Preheating front heated oxygen sensor (HO2S) | PTC resistor | Preheating: 12 V (#3) | 2, 6-3, 4 Ω at 20°C (#3-#4) | |
| Preheating, rear heated oxygen sensor (HO2S) | PTC resistor | Preheating: 12 V (#1) | Approximately 9 Ω at 20°C (#1-#2) | |
| Mass air flow (MAF) sensor | - | 12 V (#2) 5 V (#4) |
- | |
| Air temperature sensor, intake | NTC resistor | 5 V (#1) | Approximately 2300 Ω at 20°C (#1-#2) |
Integrated mass air flow (MAF) sensor |
| Leak diagnostic unit | Consists of an air pump, an electromagnetic valve and an internal heating element (PTC resistor) | 12 V (#4) | Approximately 118 Ω (#1-#4 pump motor winding) 27, 9 -34, 1 Ω (#3-#4 Valve coil) |
The heating element for heating up the pulsed secondary air injection system (PAIR) pump is controlled by the central electronic module (CEM) |
| 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) |
|
| Oil pressure switch | Pressure switch (Pressostat) | 12 V (#1) | Grounded in the cylinder block. Closed switch when the oil pressure is low | |
| Intake camshaft reset valve | Electromagnetic valve | 12 V (#1) | 3-5 Ω (#1-#2) | |
| Flywheel sensor | Engine speed sensor | - | 125Ω (+/- 17 Ω) at 20°C (#1-#2) | |
| System relay | Mechanical relay | 12V (#1) | Approximately 80 Ω (coil) | |
| Starter relay | Mechanical relay | 12V (#1) | Approximately 80 Ω (coil) | |
| Intake pressure sensor | Semi-conductor type | +5V (#3) | 10 Ω (#1-#2) |
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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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