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Home >> Volvo >> 2002 >> V70 XC >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition And Control Systems - Specifications, Electrical/Electronic >> Signal Specification, Engine Control Module (ECM) (B5244S; 2003-2007) >> Signal specification
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Signal specification

General 

All values listed below should be measured between the respective terminal in column 2 (control module terminal) and terminal #B2 unless stated otherwise in column 6 (Other).

NOTE:

It is important to connect the breakout box and check the ground terminals before taking readings.

HINT: If the numbering of the connector is different from the numbering on the breakout box, the connector number is given first, terminal #A61, followed by the breakout box number in brackets, (terminal #B1). Example: #A61 (#B1). 

U= DC voltage in volts (V) UAC = AC voltage in volts (V)
Ubat = Battery voltage in volts (V) f = Frequency in Hertz (Hz)
Ulow = Voltage approximately 0 V %pulse = Pulse ratio (%)
t = Time in milliseconds (ms) I = Current in amperes (A)
Breakout box terminal  Control module terminal  Signal type  Ignition on  Engine idling  Other 
(#A1) #A1 - - - -
(#A2) #A2 Control signal
Canister purge (CP) valve		 U = Ubat - PWM signal during activation of the canister purge (CP) valve
(#A3) #A3 - - - -
(#A4) #A4 Intake air temperature (IAT) sensor signal - (+10°C) U=2.95 V
(+20°C) U = 2.38 V
(+30°C) U=1.93 V
(+40°C) U=1.58 V		 The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor
(#A5) #A5 Power supply, throttle unit - - -
(#A6) #A6 Signal, throttle sensor 1 - - -
(#A7) #A7 Engine cooling fan (FC) control signal U = Ubat Ulow =1.5 V, U high =Ubat - 1.5 V, f=100 Hz, pulse ratio=10-90% Pulse width modulation (PWM) signal
(#A8) #A8 - - - -
(#A9) #A9 - - - -
(#A10) #A10 - - - -
(#A11) #A11 Control signal
preheating rear heated oxygen sensor (HO2S)		 U = Ubat Preheating of U=Ubat
Preheating U=Ulow		 -
(#A12) #A12 Control signal, intake camshaft reset valve - Utop =Ubat , f=250 Hz 5%, pulse ratio 20-95% Pulse width modulation (PWM), pulse ratio governs control of the camshaft
(#A13) #A13 Exhaust camshaft reset valve control signal - Utop =Ubat , f=250 Hz 5%, pulse ratio 20-95% Pulse width modulation (PWM), pulse ratio governs control of the camshaft
(#A14) #A14 Control signal
injector 5		 U = Ubat tlow =2-3 ms t increases with engine speed (RPM) and load
(#A15) #A15 Control signal
injector 3		 U = Ubat tlow =2-3 ms t increases with engine speed (RPM) and load
(#A16) #A16 Control signal
injector 1		 U = Ubat tlow =2-3 ms t increases with engine speed (RPM) and load
(#A17) #A17 Signal ground preheating front heated oxygen sensor (HO2S) U=Ulow - -
(#A18) #A18 Control signal
preheating front heated oxygen sensor (HO2S)		 U = Ubat Preheating of: U=Ubat
Preheating on: U=Ulow		 Pulse width modulation (PWM) signal
(#A19) #A19 Fuel pressure sensor signal - U=3.7 V -
(#A20) #A20 - - - -
(#A21) #A21 Signal
A/C pressure sensor		 U=0.9 V (at approximately 20°C) - -
(#A22) #A22 Mass air flow (MAF) sensor signal U=0.7 V U=1.3 V U increases with increasing air mass
(#A23) #A23 Boost pressure sensor signal U=3.63 V - U increases with pressure in the intake pipe
(#A24) #A24 Signal (+) rear heated oxygen sensor (HO2S) signal - (λ=0.95) U>700 mV
(λ=1.10) U<200 mV		 -
(#A25) #A25 Signal, throttle sensor 2 - - -
(#A26) #A26 - - - -
(#A27) #A27 Signal (+) camshaft position (CMP) sensor 2, exhaust camshaft U =5 V U=Pulsed signal, Utop =5V, U offset =2.5V The frequency varies according to engine speed (RPM)
(#A28) #A28 Signal
ignition discharge module (IDM) check, ignition coils		 - - -
(#A29) #A29 Control signal
ignition coil no. 3		 U=Ulow U=2.5 V
thigh =2 ms		 The frequency varies according to engine speed (RPM)
(#A30) #A30 Control signal
ignition coil no. 2		 U=Ulow U=2.5 V
thigh =2 ms		 The frequency varies according to engine speed (RPM)
(#A31) #A31 Control signal
ignition coil no. 1		 U=Ulow U=2.5 V
thigh =2.5 ms		 The frequency varies according to engine speed (RPM)
(#A32) #A32 Control signal
injector 2		 U = Ubat tlow =2-3 ms t increases with engine speed (RPM) and load
(#A33) #A33 Control signal
injector 4		 U = Ubat tlow =2-3 ms t increases with engine speed (RPM) and load
(#A34) #A34 Electronic throttle unit (ETM) damper motor power supply U = Ubat U = Ubat -
(#A35) #A35 Control signal (-) damper motor for the electronic throttle module (ETM) - PWM signal Utop =U bat , pulse ratio=10-90%. The polarity of the control signal changes when the damper motor is operated against the direction of rotation. The damper motor is controlled from the integrated power stage in the engine control module (ECM). Take readings to terminal #A36 (#A36)
(#A36) #A36 Control signal (+) damper motor for the electronic throttle module (ETM) - PWM signal Utop =U bat , pulse ratio=10-90%. The polarity of the control signal changes when the damper motor is operated against the direction of rotation. The damper motor is controlled from the integrated power stage in the engine control module (ECM). Take readings to terminal #A35 (#A35)
(#A37) #A37 - - - -
(#A38) #A38 - - - -
(#A39) #A39 Oil pressure switch signal U=Ulow U = Ubat -
(#A40) #A40 Signal (+) engine coolant temperature (ECT) sensor - (+30°C) U=2.63 V
(+80°C) U=0.87 V
(+100°C) U=0.55 V		 -
(#A41) #A41 Signal (-)
front heated oxygen sensor (HO2S)		 - λ= 1 when the current is approximately +0.2 mA Negative current when the fuel air mixture is rich. Range: [-12 mA, +12 mA]
(#A42) #A42 Signal (+)
front heated oxygen sensor (HO2S)		 - λ= 1 when the current is approximately +0.2 mA Positive current when the fuel air mixture is lean Range: [-12 mA, +12 mA]
(#A43) #A43 Signal ground, damper motor for the electronic throttle module (ETM) U=Ulow U=Ulow -
(#A44) #A44 - - - -
(#A45) #A45 - - - -
(#A46) #A46 Signal (+) knock sensor (KS) 1 - - Built-in resistance: 200 kΩ
(#A47) #A47 Signal (+) camshaft position (CMP) sensor 1, intake camshaft U =5 V U=Pulsed signal, Utop =5V, U offset =2.5V The frequency varies according to engine speed (RPM)
(#A48) #A48 Signal (+), flywheel sensor U=Ulow U=sine wave voltage, Utop =5 V, U offset =2.5 V Take readings to terminal #A66 (#B6). The frequency increases with engine speed (RPM)
(#A49) #A49 - - - -
(#A50) #A50 Control signal
ignition coil no. 5		 U=Ulow U=2.5 V
thigh =2 ms		 The frequency varies according to engine speed (RPM)
(#A51) #A51 Control signal
ignition coil no. 4		 U=Ulow U=2.5 V
thigh =2 ms		 The frequency varies according to engine speed (RPM)
(#A52) #A52 Power supply, damper motor for the electronic throttle module (ETM) U = Ubat U = Ubat -
(#A53) #A53 Power ground 3 U=Ulow - -
(#A54) #A54 Power ground 2 U=Ulow - -
(#A55) #A55 - - - -
(#A56) #A56 - - - -
(#A57) #A57 Power supply, camshaft position (CMP) sensor U =5 V - -
(#A58) #A58 Power supply, manifold absolute pressure (MAP) sensor
A/C pressure sensor, oil quality sensor		 U =5 V - Oil quality sensor only MY2005- and only certain markets
(#A59) #A59 Fuel temperature sensor signal - (+10°C) U=3.96 V, (+20°C) U=3.57 V, (+30°C) U=3.15 V, (+40°C) U=2.70 V Temperature range: -40°C - +125°C
(#A60) #A60 Signal ground
mass air flow (MAF) sensor		 U=Ulow - -
(#B1) #A61 Signal ground
Intake air temperature (IAT) sensor inlet
the engine coolant temperature (ECT) sensor
rear λ-sensor, oil quality sensor		 U=Ulow - Oil quality sensor only MY2005- and only certain markets
(#B2) #A62 Power ground 1 U=Ulow - -
(#B3) #A63 - - - -
(#B4) #A64 Signal ground, knock sensor (KS) 1 - - Built-in resistance: 200 kΩ
(#B5) #A65 Signal ground
the camshaft position (CMP) sensor		 U=Ulow - -
(#B6) #A66 Signal (-) flywheel sensor U=Ulow U=sine wave voltage, Utop =5 V, U offset =2.5 V Take readings to terminal #A48 (#A48). The frequency increases with engine speed (RPM)
(#B7) #A67 - - - -
(#B8) #A68 Signal oil quality sensor - PWM-signal Utop =5 V Pulse ratio 17-83% T=120ms Pulse train with three pulses then pause of 1.2 seconds. Pulse no. 1= not used. Pulse no. 2= oil level. Pulse no. 3= not used. Pulse ratio for pulse no. 2 changes according to current oil level. The PWM-signal is generated by the oil quality sensor. Only MY2005- and only certain markets.
(#B9) #A69 - - - -
(#B10) #A70 Power supply 12 V U = Ubat U = Ubat -
Breakout box terminal  Control module terminal  Signal type  Ignition on  Engine idling  Other 
(#B11) #B1 Control modules communication cable (CAN L) low speed - - -
(#B12) #B2 - - - -
(#B13) #B3 - - - -
(#B14) #B4 Signal ground
intake manifold air temperature sensor
fuel tank pressure sensor
clutch pedal sensor
brake pedal sensor		 U=Ulow - -
(#B15) #B5 Signal ground
accelerator pedal (AP) position sensor		 U=Ulow - -
(#B16) #B6 - - - -
(#B17) #B7 Control signal, leak diagnostic unit, pump U = Ubat - -
(#B18) #B8 Signal, coolant level sensor U=Ulow U=Ulow -
(#B19) #B9 Power supply, 5 V accelerator pedal (AP) position sensor U =5 V - -
(#B20) #B10 - - - -
(#B21) #B11 30-supply (power supply from battery) U = Ubat U = Ubat Ignition off: U = Ubat
(#B22) #B12 - - - -
(#B23) #B13 Control module communication cable (CAN H) high speed - - -
(#B24) #B14 - - - -
(#B25) #B15 Clutch pedal sensor signal - - Analogue signal, varies depending on the position of the clutch pedal
(#B26) #B16 - - - -
(#B27) #B17 Signal, accelerator pedal (AP) position sensor - - Analogue signal, varies depending on the position of the accelerator pedal (AP)
(#B28) #B18 - - - -
(#B29) #B19 - - - -
(#B30) #B20 - - - -
(#B31) #B21 - - - -
(#B32) #B22 Diagnostic lead C-link U=90% of Ubat - Other values apply if a generic fault-tracing instrument is connected to the data link connector (DLC)
(#B33) #B23 Signal crank, 50-supply U=Ulow U=Ulow At crank: U = Ubat
(#B34) #B24 - - - -
(#B35) #B25 Signal, accelerator pedal (AP) position sensor Utop =Ubat
t = 4 ms
pulse ratio = 8-88%		 - Pulse width modulation (PWM) signal from the accelerator pedal (AP) position sensor to the engine control module (ECM)
(#B36) #B26 Brake lamp switch signal When the brake pedal is depressed: U=U bat . When the brake pedal is not pressed: U=Ulow - -
(#B37) #B27 - - - -
(#B38) #B28 - - - -
(#B39) #B29 Signal, outside temperature sensor (0°C) U = 3.99 V
(+10°C) U = 3.53 V
(+20°C) U = 3.01 V
(+30°C) U = 2.47 V		 - Temperature range: [-50°C, +120°C]
(#B40) #B30 - - - -
(#B41) #B31 - - - -
(#B42) #B32 - - - -
(#B43) #B33 - - - -
(#B44) #B34 - - - -
(#B45) #B35 - - - -
(#B46) #B36 - - - -
(#B47) #B37 Signal, ignition on, 15-supply U = Ubat U = Ubat Ignition off: U=Ulow
(#B48) #B38 System relay control signal U=Ulow U=Ulow Relay activated: U=Ulow , Relay not activated: U=Ubat , The system relay runs on (2-5 minutes)
(#B49) #B39 - - - -
(#B50) #B40 Control signal, leak diagnostic unit, valve - - Valve activated: U=Ulow Valve not activated: U = Ubat
(#B51) #B41 - - - -
(#B52) #B42 - - - -
(#B53) #B43 - - - -
(#B54) #B44 Control signal, air conditioning (A/C) relay - - Air conditioning (A/C) relay activated: U=Ulow Air conditioning (A/C) relay not activated: U = Ubat
(#B55) #B45 Fuel pump (FP) activation control signal - - PWM signal to the central electronic module (CEM) to control the fuel pump (FP) relay
(#B56) #B46 Malfunction indicator lamp (MIL) control signal U=Ulow Not activated: U=Ubat Activated: U=Ulow -
(#B57) #B47 Fuel pump control signal - - -
(#B58) #B48 Control signal, engine cooling fan (FC), control modules - Not activated: U=Ubat Activated: U=Ulow The engine cooling fan (FC) is controlled by the engine control module (ECM)
(#B59) #B49 - - - -
(#B60) #B50 - - - -
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