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Home >> Volvo >> 2012 >> XC90 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control - Signal Description And Specification >> Component Specifications, Engine Control Module (ECM) (B8444S; 2005-2011) >> Component Specifications
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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.

Numbers in brackets indicate to which pin of the component the value corresponds.

Designation  Type  Supply voltage  Value  Other 
Air conditioning (A/C) relay Mechanical relay 12V 92 Ω± 10% at +23°C  
System relay
Starter relay
Mechanical relay 12V 82Ω ± 10% at 23°C (coil)  
A/C pressure sensor Absolute manifold absolute pressure (MAP) sensor 5 V (#3)   Air conditioning (A/C) high pressure
Stop lamp switch Position switch 12 V (#1) The switch is closed when the pedal is depressed (terminals #1-#5)  
Intake pressure sensor   5 V (#3)    
Fuel temperature sensor NTC resistor 5V (#3) 2500Ω± 6% at 20°C (terminals #1-#2) Integrated in the fuel pressure sensor
Fuel pressure sensor Piezo resistive pressure sensor 5V (#3)    
Engine cooling fan (FC) control module - 12 V (#2)    
Evaporative emission system (EVAP) valve Electromagnetic valve 12 V (#1) 20.5Ω ± 1.5Ω  
Valve variable inlet Electromagnetic valve 12 V (#1) 37-44 Ω  
Accelerator pedal (AP) position sensor Electronic pedal sensor with two output signals, PWM and a linear analog signal 12 V (#1) voltage supply digital position sensor
5 V (#6) Voltage supply analog position sensor
   
Throttle unit Electronic throttle module (ETM) with two integrated potentiometers and a throttle motor 5 V (#5) 1.2Ω (#1-#2 motor winding) at normal operating temperature. -
Injector Electromagnetic injector valve 12 V (#2) 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 at 25 ± 10°C(#1-#2)  
Oil quality sensor   5 V (#3)    
Ignition coil   12 v (#1) Approximately 0.98Ω (primary winding)  
Coolant level sensor Position switch Ground connection (terminal #2) Closed when the engine coolant level is normal  
Preheating front heated oxygen sensor (HO2S) PTC resistor 12 V (#3) 2.18-2.68 Ω at 20°C (terminals #1-#2)  
Preheating, rear heated oxygen sensor (HO2S) PTC resistor 12 V (#1) Approximately 13 Ω ± 1.3Ω (terminal #1-#2)  
Leak diagnostic unit Consists of pump, electromagnetic valve and an internal heating element (PTC resistor) 12 V (#4) 118Ω (#1-#4 pump motor winding)
29.5Ω ± 10% (terminals #3-#4 Valve coil)
30Ω (#2-#4 Heating element)
 
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 sensor Pressure switch (Pressostat) Grounded in the engine block Closed switch when the oil pressure is low  
Reset valve camshaft Electromagnetic valve 12 V (#1) 7.4 Ω ± 0.5Ω at 20°C (terminals #1-#2)  
Flywheel sensor Engine speed sensor - 125, 5Ω ± 17Ω(#1-#2)  
Outside temperature sensor NTC resistor 5 V (#1) 18702Ω at -20°C
6318Ω at 0°C
2424Ω at 20°C
1034Ω at 40°C
(#1- #3)