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.
Signal Specification, Engine Control Module (ECM)
2009 Volvo C30 R-Design, AutomaticSECTION Signal Specification, Engine Control Module (ECM)
General
All the values given below are measured between the terminal in column 1 (Term. control module) and terminal #A5 (#A5) unless otherwise indicated in column 6 (Other).
Control module connections:
- #A1-#A52 correspond to adapter connector A (breakout box #A1-#A52).
- #B1-#B42 correspond to adapter connector B (breakout box #B1-#B42).
NOTE:
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | Ulow = | Voltage approximately 0 V |
| Ubat = | Battery voltage (V) |
CONNECTOR A
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Idling | Other |
|---|---|---|---|---|---|
| #A1 | #A1 | Ignition coil cylinders 2 and 3, control signal | 12 V | - | - |
| #A2 | #A2 | - | - | - | - |
| #A3 | #A3 | Ignition coil cylinders 1 and 3, control signal | 12 V | - | - |
| #A4 | #A4 | - | - | - | - |
| #A5 | #A5 | Power ground 4 | U=Ulow | U=Ulow | - |
| #A6 | #A6 | Throttle unit, potentiometer 1 and 2, signal ground | - | - | - |
| #A7 | #A7 | Generator, control signal | - | - | Pulse width modulation (PWM) signal |
| #A8 | #A8 | System relay, control signal | U=Ulow | - | - |
| #A9 | #A9 | Air conditioning (A/C) relay, control signal | - | - | A/C-relay activated: U=Ulow A/C-relay not activated U=Ubat |
| #A10 | #A10 | Cooling fan control module, control signal | - | - | PWM signal to cooling fan control module. |
| #A11 | #A11 | - | - | - | - |
| #A12 | #A12 | Injector cylinder 4, control signal | U=Ubat | t = 1-3 ms | t increases with engine speed and load |
| #A13 | #A13 | Injector cylinder 2, control signal | U=Ubat | t = 1-3 ms | t increases with engine speed and load |
| #A14 | #A14 | - | - | - | - |
| #A15 | #A15 | - | - | - | - |
| #A16 | #A16 | - | - | - | - |
| #A17 | #A17 | Air conditioning (A/C) pressure sensor, power supply | 5 V | - | - |
| #A18 | #A18 | - | - | - | - |
| #A19 | #A19 | Power supply, sensor | 5 V | - | - |
| #A20 | #A20 | Pressure/temperature sensor, intake pipe, pressure signal | - | - | Working range: 10-115 kpa (0.40 V - 4.65V). |
| #A21 | #A21 | Throttle unit, potentiometer 2, signal | - | - | - |
| #A22 | #A22 | Throttle unit, potentiometers 1 and 2, power supply | 5 V | - | - |
| #A23 | #A23 | - | - | - | - |
| #A24 | #A24 | - | - | - | - |
| #A25 | #A25 | - | - | - | - |
| #A26 | #B26 | - | - | - | - |
| #A27 | #B27 | Injector cylinder 1, control signal | U=Ubat | t = 1-3 ms | t increases with engine speed and load |
| #A28 | #A28 | Injector cylinder 3, control signal | U=Ubat | t = 1-3 ms | t increases with engine speed and load |
| #A29 | #A29 | - | - | - | - |
| #A30 | #A30 | - | - | - | - |
| #A31 | #A31 | Knock sensor, signal ground (-) | - | - | - |
| #A32 | #A32 | Knock sensor, signal (+) | - | - | - |
| #A33 | #A33 | Generator, control signal | - | - | - |
| #A34 | #A34 | - | - | - | - |
| #A35 | #A35 | Ground | U=Ulow | U=Ulow | - |
| #A36 | #A36 | - | - | - | - |
| #A37 | #A37 | - | - | - | - |
| #A38 | #A38 | Rear heated oxygen sensor (HO2S), signal (+) | - | - | - |
| #A39 | #A39 | Air conditioning (A/C) pressure sensor, ground | - | - | - |
| #A40 | #A40 | Brake light signal from central electronic module (CEM) | U=Ubat | - | - |
| #A41 | #A41 | - | - | - | - |
| #A42 | #A42 | Power ground 3 | U=Ulow | U=Ulow | - |
| #A43 | #A43 | - | - | - | - |
| #A44 | #A44 | - | - | - | - |
| #A45 | #A45 | Ground | U=Ulow | U=Ulow | - |
| #A46 | #A46 | Ground | U=Ulow | U=Ulow | - |
| #A47 | #A47 | Accelerator pedal (AP) position sensor | - | - | Pulse width modulation (PWM) signal |
| #A48 | #A48 | Electronic throttle unit, potentiometer 1 | - | - | - |
| #A49 | #A49 | Front heated oxygen sensor (HO2S), signal (+) | - | - | - |
| #A50 | #A50 | - | - | - | - |
| #A51 | #A51 | Power supply, sensor | 5 V | - | - |
| #A52 | #A52 | Pressure/temperature sensor, inlet manifold, power supply | 5 V | - | - |
CONNECTOR B
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Idling | Other |
|---|---|---|---|---|---|
| #B1 | #B1 | Ground | U=Ulow | U=Ulow | - |
| #B2 | #B2 | Front heated oxygen sensor (HO2S), signal ground | U=Ulow | U=Ulow | - |
| #B3 | #B3 | Pressure/temperature sensor, inlet manifold, temperature signal | - | - | - |
| #B4 | #B4 | Ground | U=Ulow | U=Ulow | - |
| #B5 | #B5 | Ground | U=Ulow | U=Ulow | - |
| #B6 | #B6 | Front heated oxygen sensor preheating, control signal | U=Ubat | Preheating off: U=Ubat . Preheating on: U=Ulow . | Frequency increases at high engine speed. |
| #B7 | #B7 | Power ground 1 | U=Ulow | U=Ulow | - |
| #B8 | #B8 | Power supply via system relay | U=Ubat | U=Ubat | 12 V power supply to engine control module (ECM) from system relay. |
| #B9 | #B9 | Power supply (30- supply) | U=Ubat | U=Ubat | Power supply 12 V directly from the battery. |
| #B10 | #B10 | - | - | - | - |
| #B11 | #B11 | - | - | - | - |
| #B12 | #B12 | - | - | - | - |
| #B13 | #B13 | Engine coolant temperature (ECT) sensor, signal ground | - | - | - |
| #B14 | #B14 | Rear heated oxygen sensor (HO2S), signal ground | - | - | - |
| #B15 | #B15 | - | - | - | - |
| #B16 | #B16 | EVAP valve, control signal | U=Ubat | - | - |
| #B17 | #B17 | Pressure/ temperature sensor, inlet manifold, ground | - | - | - |
| #B18 | #B18 | - | - | - | - |
| #B19 | #B19 | HS CAN L (-) | - | - | - |
| #B20 | #B20 | - | - | - | - |
| #B21 | #B21 | Power supply (wake up, 15-feed) | 12 V | 12 V | - |
| #B22 | #B22 | Air conditioning (A/C) pressure switch, low pressure side, signal | - | - | - |
| #B23 | #B23 | - | - | - | - |
| #B24 | #B24 | - | - | - | - |
| #B25 | #B25 | Power supply, sensor | 5 V | - | - |
| #B26 | #B26 | Impulse sensor, signal ground | - | U=sinus voltage | Frequency increases at high engine speed. |
| #B27 | #B27 | Camshaft position (CMP) sensor, signal ground | - | - | - |
| #B28 | #B28 | - | - | - | - |
| #B29 | #B29 | Power steering switch, signal | - | - | - |
| #B30 | #B30 | Starter relay, control signal | - | - | - |
| #B31 | #B31 | HS CAN H (+) | - | - | - |
| #B32 | #B32 | - | - | - | - |
| #B33 | #B33 | - | - | - | - |
| #B34 | #B34 | Air conditioning (A/C) pressure sensor, signal | - | - | - |
| #B35 | #B35 | Oil pressure switch | - | - | Supplied Ubat from the engine control module (ECM). Switch closed (oil pressure): Ulow Switch open circuit (no/low oil pressure): Ubat . |
| #B36 | #B36 | Engine coolant temperature (ECT) sensor, signal | - | - | Approx. 3.1 V at +20 °C Approx. 2.9 V at +25 °C. Approx. 0.8 V at +80 °C. |
| #B37 | #B37 | Impulse sensor, signal (+) | - | U=sinus voltage | Frequency increases at high engine speed. |
| #B38 | #B38 | Camshaft position sensor, signal (+) | - | - | - |
| #B39 | #B39 | Rear heated oxygen sensor preheating, control signal | U=Ubat | Preheating off: U=Ubat Preheating on: U=Ulow | - |
| #B40 | #B40 | Power ground 2 | U=Ulow | U=Ulow | - |
| #B41 | #B41 | Throttle motor, power supply | - | - | - |
| #B42 | #B42 | Throttle motor, ground | - | - | - |
RENDER: 1.0x
NO RELATED
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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.