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.
2011 Volvo V50 T-5FACTORY OEM SERVICE PROCEDURE
Signal Specification
General
All values given below are between the terminals stated in column 1 and breakout box terminal in the terminal) and terminal #B1 (#C1) unless otherwise indicated in column 6 (Miscellaneous).
Control module terminals:
- #A1-#A60 correspond to adapter connector A (breakout box #A1-#A60)
- #A61-#A96 correspond to adapter connector B (breakout box #B1-#B36)
- #B1-#B58 correspond to adapter connector C (breakout box #C1-#C58).
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 | Idle | Other |
|---|---|---|---|---|---|
| #A1 | #A1 | Injector no. 1, control signal | U = Ubat | t= 1-3 ms | time increases with engine speed (RPM) and load |
| #A2 | #A2 | Injector no. 3, control signal | U = Ubat | t= 1-3 ms | time increases with engine speed (RPM) and load |
| #A3 | #A3 | Injector no. 5, control signal | U = Ubat | t= 1-3 ms | time increases with engine speed (RPM) and load |
| #A4 | #A4 | - | - | - | |
| #A5 | #A5 | - | - | - | |
| #A6 | #A6 | - | - | - | |
| #A7 | #A7 | Knock sensor (KS) 1, signal (+) | U=Ulow | - | |
| #A8 | #A8 | - | - | - | |
| #A9 | #A9 | Oil pressure sensor | - | - | Supplied with Ubat from the engine control module (ECM). Closed switch (oil pressure): Ulow Switch open-circuit (no/low oil pressure):Ubat. |
| #A10 | #A10 | - | - | - | |
| #A11 | #A11 | - | - | - | |
| #A12 | #A12 | Engine coolant temperature (ECT) sensor, signal ground | U=Ulow | U=Ulow | |
| #A13 | #A13 | Sensor, signal ground | U=Ulow | U=Ulow | |
| #A14 | #A14 | Throttle position (TP), signal ground | U=Ulow | U=Ulow | |
| #A15 | #A15 | Fuel pressure sensor, signal ground | U=Ulow | U=Ulow | |
| #A16 | #A16 | Intake camshaft position (CMP) sensor, power supply 5 V | U =5 V | - | |
| #A17 | #A17 | Camshaft position (CMP) sensor, exhaust, power supply 5 V | U =5 V | - | |
| #A18 | #A18 | Mass air flow sensor, power supply 5 V | U =5 V | - | Connected internally via power amplifier in Engine Control Module (ECM) with boost pressure sensor, fuel pressure sensor and AC high pressure sensor. |
| #A19 | #A19 | Throttle position (TP) sensor, power supply 5 V | U =5 V | - | |
| #A20 | #A20 | - | - | - | |
| #A21 | #A21 | - | - | - | |
| #A22 | #A22 | - | - | - | |
| #A23 | #A23 | - | - | - | |
| #A24 | #A24 | - | - | - | |
| #A25 | #A25 | Injector no. 2, control signal | U = Ubat | t= 1-3 ms | time increases with engine speed (RPM) and load |
| #A26 | #A26 | Injector no. 4, control signal | U = Ubat | t= 1-3 ms | time increases with engine speed (RPM) and load |
| #A27 | #A27 | - | - | - | |
| #A28 | #A28 | - | - | - | |
| #A29 | #A29 | - | - | - | |
| #A30 | #A30 | - | - | - | |
| #A31 | #A31 | Knock sensor (KS) 2, signal (-) | U=Ulow | - | |
| #A32 | #A32 | - | - | - | |
| #A33 | #A33 | - | - | - | |
| #A34 | #A34 | Ignition coil cyl 3, control signal | U=Ulow | - | The frequency increases with engine speed (RPM). |
| #A35 | #A35 | - | - | - | |
| #A36 | #A36 | Intake camshaft position (CMP) sensor, signal ground | U=Ulow | U=Ulow | |
| #A37 | #A37 | Exhaust camshaft position (CMP) sensor, signal ground | U=Ulow | U=Ulow | |
| #A38 | #A38 | Boost pressure sensor (T-MAP), signal ground | U=Ulow | U=Ulow | |
| #A39 | #A39 | - | - | - | |
| #A40 | #A40 | - | - | - | |
| #A41 | #A41 | Fuel pressure sensor, signal fuel temperature | U≈ 0.5-4.5 V | U≈ 0.5-4.5 V | U drops with increased fuel temperature. The fuel temperature sensor is integrated in the fuel pressure sensor. |
| #A42 | #A42 | Engine coolant temperature (ECT) sensor, signal | (+30°C) U=1.22 V (+80°C) U=0.29 V (+100°C) U=0.17 V | (+30°C) U=1.22 V (+80°C) U=0.29 V (+100°C) U=0.17 V | U drops with increased engine coolant temperature. |
| #A43 | #A43 | Boost pressure sensor, power supply 5 V | U =5 V | - | Connected internally via power amplifier in Engine Control Module (ECM) with mass air flow sensor, fuel pressure sensor and AC high pressure sensor. |
| #A44 | #A44 | Fuel pressure sensor, power supply | U =5 V | U =5 V | Connected internally via power amplifier in Engine Control Module (ECM) with boost pressure sensor, mass air flow sensor and AC high pressure sensor. |
| #A45 | #A45 | - | - | - | |
| #A46 | #A46 | LIN bus (Local Interconnect Network) | - | - | Alternator control module (ACM) 2005-. |
| #A47 | #A47 | - | - | - | |
| #A48 | #A48 | - | - | - | |
| #A49 | #A49 | Rear heated oxygen sensor (HO2S) preheating, control signal | U = Ubat | Preheating off: U=Ubat Preheating on: U=Ulow | Pulsed signal. |
| #A50 | #A50 | Evaporative emission system (EVAP) valve, control signal | U = Ubat | Pulse width modulation (PWM) signal during opening (control) of the evaporative emission system (EVAP) valve. % duty varies depending on control. | |
| #A51 | #A51 | Turbocharger (TC) control valve, control signal | U = Ubat | U = Ubat | PWM signal during opening (control) of the turbocharger (TC) control valve. % duty varies depending on control. |
| #A52 | #A52 | - | - | - | |
| #A53 | #A53 | Engine speed (RPM) sensor, signal (-) | U=2.5 V | U = sine wave voltage Utop = 5 V Uoffset = 2.5 V | Measure to terminal #A77 #B17). The frequency increases with engine speed (RPM). |
| #A54 | #A54 | - | - | - | |
| #A55 | #A55 | Knock sensor (KS) 1, signal (-) | U=Ulow | - | |
| #A56 | #A56 | ||||
| #A57 | #A57 | Ignition coil cyl 2, control signal | U=Ulow | - | The frequency increases with engine speed (RPM). |
| #A58 | #A58 | Ignition coil cyl 5, control signal | U=Ulow | - | The frequency increases with engine speed (RPM). |
| #A59 | #A59 | Exhaust camshaft position (CMP) sensor, signal | U =5 V | U = Pulsed signal Utop = 5 V Uoffset = 2.5V | The frequency varies according to engine speed (RPM). |
| #A60 | #A60 | - | - | - | |
| #A61 | #B1 | Mass air flow (MAF) sensor, signal ground | U=Ulow | U=Ulow | |
| #A62 | #B2 | - | - | - | |
| #A63 | #B3 | Mass air flow (MAF) sensor, signal | U = 1 V | U≈1.5 V | U increases with increasing air mass. |
| #A64 | #B4 | - | - | - | |
| #A65 | #B5 | Throttle position (TP) sensor circuit 1, signal | U≈ 0.4-4 V | U≈ 0.4-4 V | U varies depending on the position of the throttle. U increases with increased throttle opening. |
| #A66 | #B6 | - | - | - | |
| #A67 | #B7 | Front heated oxygen sensor (HO2S), signal (+) | - | - | Pulsed current signal, not measured. |
| #A68 | #B8 | Front heated oxygen sensor (HO2S), pump current | - | - | Pulsed current supply, not measured. |
| #A69 | #B9 | - | - | - | |
| #A70 | #B10 | - | - | - | |
| #A71 | #B11 | - | - | - | |
| #A72 | #B12 | Reset valve camshaft intake (VVT), control signal | - | PWM signal U top=Ubat f=250 Hz (±12.5 Hz) | % duty varies depending on control. |
| #A73 | #B13 | Front heated oxygen sensor (HO2S), preheating, control signal | U = Ubat | Preheating off: U=Ubat Preheating on: U=Ulow | |
| #A74 | #B14 | Throttle unit motor, control signal (+) | - | PWM signal U top=Ubat Pulse ratio 0-100%. The polarity of the control signal switches when the damper motor is to be deployed in the opposite direction. | The throttle motor is controlled using a PWM signal from the integrated power amplifier in the Engine Control Module (ECM) measured to terminal #A75 (#B15). |
| #A75 | #B15 | Throttle unit motor, control signal (-) | - | PWM signal U top=Ubat Pulse ratio 0-100%. The polarity of the control signal switches when the damper motor is to be deployed in the opposite direction. | The throttle motor is controlled using a PWM signal from the integrated power amplifier in the Engine Control Module (ECM) measured to terminal #A74 (#B14). |
| #A76 | #B16 | - | - | - | |
| #A77 | #B17 | Engine speed (RPM) sensor, signal (+) | U=2.5 V | U = sine wave voltage Utop = 5 V Uoffset = 2.5 V | Measured to #A53 (#A53). The frequency increases with engine speed (RPM). |
| #A78 | #B18 | - | - | - | |
| #A79 | #B19 | Knock sensor (KS) 2, signal (+) | U=Ulow | - | |
| #A80 | #B20 | - | - | - | |
| #A81 | #B21 | Ignition coil cyl 1, control signal | U=Ulow | - | The frequency increases with engine speed (RPM). |
| #A82 | #B22 | Ignition coil cyl 4, control signal | U=Ulow | - | The frequency increases with engine speed (RPM). |
| #A83 | #B23 | Intake camshaft position (CMP) sensor, signal | U =5 V | U = Pulsed signal Utop = 5 V Uoffset = 2.5V | The frequency varies according to engine speed (RPM). |
| #A84 | #B24 | - | - | - | |
| #A85 | #B25 | - | |||
| #A86 | #B26 | Boost pressure sensor (T-MAP), signal air pressure intake manifold | U≈2 V | U≈2 V | U increases with higher air pressure. |
| #A87 | #B27 | Boost pressure sensor (T-MAP), signal intake air temperature (IAT) sensor | (+20°C) U=3.50 V (+30°C) U=3.00 V (+40°C) U=2.50 V | (+20°C) U=3.50 V (+30°C) U=3.00 V (+40°C) U=2.50 V | The intake air temperature (IAT) sensor is integrated in the boost pressure sensor. |
| #A88 | #B28 | Throttle position (TP) sensor circuit 2, signal | U≈4-0.4 V | U≈4-0.4 V | The voltage varies depending on the position of the throttle. U decreases with increasing throttle opening. |
| #A89 | #B29 | Fuel pressure sensor, signal fuel pressure | - | 350-400 kPa (absolute pressure) U = 1.8 - 2 V | The voltage increases with higher fuel pressure. |
| #A90 | #B30 | Rear heated oxygen sensor (HO2S), signal (+) | U≈0.50 V | Between 0.6 -0.3 V | |
| #A91 | #B31 | Front heated oxygen sensor (HO2S), signal (-) | - | - | Pulsed current signal, not measured. |
| #A92 | #B32 | Front heated oxygen sensor (HO2S), calibration current | - | - | Pulsed current signal, not measured. |
| #A93 | #B33 | - | - | - | |
| #A94 | #B34 | - | - | - | |
| #A95 | #B35 | Rear heated oxygen sensor (HO2S), signal (-) | U=Ulow | U=Ulow | |
| #A96 | #B36 | Reset valve camshaft exhaust (VVT), control signal | PWM signal Utop =Ubat f=250 Hz (±12.5 Hz) | % duty varies depending on control. |
CONNECTOR B
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #B1 | #C1 | - | - | - | - |
| #B2 | #C2 | Power ground 1 | U=Ulow | - | Ground terminal, connected to the chassis at the right-hand suspension turret |
| #B3 | #C3 | Power supply from the system relay | U = Ubat | - | Power supply 12 V engine control module (ECM) from the system relay. |
| #B4 | #C4 | - | - | - | |
| #B5 | #C5 | - | - | - | |
| #B6 | #C6 | Power ground 3 | U=Ulow | - | Ground terminal, connected to the chassis at the right-hand suspension turret |
| #B7 | #C7 | - | - | - | - |
| #B8 | #C8 | Engine cooling fan control module, control signal | - | - | PWM signal to the engine cooling fan control module. |
| #B9 | #C9 | Starter relay, control signal (-) | - | - | |
| #B10 | #C10 | A/C relay, control signal | - | - | Air conditioning (A/C) relay activated: U=Ulow Air conditioning (A/C) relay not activated: U = Ubat |
| #B11 | #C11 | Starter relay, power supply (15-feed) | 12 V | 12 V | |
| #B12 | #C12 | - | - | - | |
| #B13 | #C13 | Transmission control module (TCM), signal gear position / Clutch pedal switch, open - closed | With P/N connected: U=Ulow With P/N disconnected: U = Ubat | P/N | Grounded in the transmission control module (TCM) when in P/N. Pedal pressed down:U=Ulow |
| #B14 | #C14 | Wake-up, 15-feed | 12 V | 12 V | |
| #B15 | #C15 | Power supply (15-feed) | 12 V | 12 V | |
| #B16 | #C16 | Power supply, engine control module (ECM) (terminal 30) | - | - | |
| #B17 | #C17 | Start, signal 50-supply | Signal from the ignition switch via the central electronic module (CEM). When the ignition is in position for start: U=U low | ||
| #B18 | #C18 | - | - | - | |
| #B19 | #C19 | - | - | - | |
| #B20 | #C20 | - | - | ||
| #B21 | #C21 | Fuel pump (FP) control module, control signal | - | PWM signal pulse ratio 35% (+/-5%) engine at operating temperature | PWM signal transmitted by the engine control module (ECM) to the fuel pump (FP) control module. The pulse ratio varies with the requested fuel pressure. |
| #B22 | #C22 | - | - | - | |
| #B23 | #C23 | Leak diagnostic unit, pump motor, power supply | Pump motor running: U=Ulow Pump motor not running: U = Ubat | - | Certain markets only. |
| #B24 | #C24 | - | - | - | |
| #B25 | #C25 | Air conditioning (A/C) low pressure switch, signal | - | - | High air conditioning (A/C) pressure: Ubat Low air conditioning (A/C) pressure: U low |
| #B26 | #C26 | Accelerator pedal (AP) position sensor, PWM signal | PWM signal Utop =Ubat t=5 ms pulse ratio≈ 6-90% | - | PWM signal from accelerator pedal sensor, directly connected to Engine Control Module (ECM). |
| #B27 | #C27 | System relay, control signal | - | U=Ulow | Relay activated: U=Ulow Relay not activated: U=Ubat Note that the relay can be closed after ignition off due to time for "after run". |
| #B28 | #C28 | - | - | - | |
| #B29 | #C29 | - | - | - | |
| #B30 | #C30 | Stop lamp switch, signal | When the brake pedal is depressed: U=Ubat When the brake pedal is unaffected U=Ulow | - | Signal via the central electronic module (CEM). |
| #B31 | #C31 | A/C high pressure sensor, power supply | - | - | Connected internally via power amplifier in Engine Control Module (ECM) with boost pressure sensor, fuel pressure sensor and mass air flow sensor. |
| #B32 | #C32 | - | - | - | |
| #B33 | #C33 | - | - | - | |
| #B34 | #C34 | - | - | - | |
| #B35 | #C35 | - | - | - | |
| #B36 | #C36 | - | - | - | |
| #B37 | #C37 | - | - | - | |
| #B38 | #C38 | - | - | - | |
| #B39 | #C39 | - | - | - | |
| #B40 | #C40 | - | - | - | |
| #B41 | #C41 | HS-CAN L | - | - | Connected to #B54 (#C54) (HS-CAN H) via terminating resistor. |
| #B42 | #C42 | - | - | - | |
| #B43 | #C43 | - | - | - | |
| #B44 | #C44 | HS-CAN L, transmission control module (TCM) | - | - | |
| #B45 | #C45 | Leakage diagnosis unit, preheating, control signal | - | - | Heating element activated: U=Ulow. Heating element not activated: U=Ubat. |
| #B46 | #C46 | Leak diagnostic unit, valve, control signal | - | - | Only certain markets. Valve activated: U=Ulow Valve not activated: U = Ubat |
| #B47 | #C47 | Diagnostic lead C-line | - | - | |
| #B48 | #C48 | - | - | - | |
| #B49 | #C49 | - | - | - | |
| #B50 | #C50 | - | - | - | |
| #B51 | #C51 | Air conditioning (A/C) high pressure sensor signal | - | - | The voltage increases with increased pressure. |
| #B52 | #C52 | - | - | - | |
| #B53 | #C53 | A/C high pressure sensor, signal ground | U=Ulow | - | |
| #B54 | #C54 | HS-CAN H | - | - | Connected to #B41 (#C41) (HS-CAN L) via terminating resistor |
| #B55 | #C55 | - | - | - | |
| #B56 | #C56 | - | - | - | |
| #B57 | #C57 | HS-CAN H, transmission control module (TCM) | - | - | |
| #B58 | #C58 | - | - | - |
Factory Service Tools
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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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