LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2009 >> C70 Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control Module (ECM) - Specifications, Electrical/Electronic >> Specifications, Engine Control Module (ECM) (B5254T3; 2006-2007) >> Component Specifications
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 figure within the brackets 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 -
Brake 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) 5896 Ω at 0 °C
3792 Ω at 10 °C
2500Ω at 20 °C
1707Ω at 30 °C
1175 Ω at 40 °C
(#1-#2)
Integrated in the fuel pressure sensor
Fuel pressure sensor Piezoresistive pressure sensor 5V (#3) -  
Engine cooling fan (FC) control module - 12 V (#2) -  
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 5 V (#1) 12 V (#6) -  
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 (terminals #2-#6 potentiometer 1).
Approximately 1480 Ω when the throttle is closed. Approximately 500 Ω at wide open throttle (terminals #2-#5 potentiometer 2)
-
Fuel injector Electromagnetic injector valve 12 V (#1) Approximately 12 Ω at 20 °C (terminal #1-#2)  
Camshaft position (CMP) sensor Magneto-resistive sensor 5 V (#1) -  
Knock sensor (KS) Piezo electric component - Greater than 1 MΩ (terminal #1-#2 front knock sensor (KS).
Greater than 1 MΩ
(terminals #3-#4 rear knock sensor (KS)
Separate signal ground for the knock sensors (KS)
Clutch pedal switch Position switch 12 V (#1), ground terminal (#2) - Closed at 75% pressed down.
Charge pressure sensor Absolute pressure sensor 5 V (#3) -  
Preheating front heated oxygen sensor (HO2S) PTC resistor 12 V (#3) 2.6-3.4 Ω at 20 °C (#3-#4)  
Preheating, rear heated oxygen sensor (HO2S) PTC resistor 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 (#3) 5886 Ω at 0 °C
3791 Ω at 10 °C
2510 Ω at 20 °C
1715 Ω 30 °C
(#1-#2)
Integrated in the boost pressure 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 (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)
 
Oil pressure switch Pressure switch (Pressostat) 12 V (#1) Grounded in the cylinder block. Closed switch when the oil pressure is low  
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)  
Turbocharger (TC) control valve Electromagnetic valve (3 way) 12 V (#1) 23 Ω (+/- 1, 2 Ω) at 20 °C (#1-#2)