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.
2010 Volvo C70 StandardFACTORY 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) |
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #A1 | #A1 | - | - | - | - |
| #A2 | #A2 | - | - | - | - |
| #A3 | #A3 | Mass air flow (MAF), signal ground, intake air temperature (IAT) sensor | U=Ulow | U=Ulow | - |
| #A4 | #A4 | Manifold absolute pressure (MAP) sensor, signal ground | U=Ulow | U=Ulow | - |
| #A5 | #A5 | Fuel pressure sensor, signal ground | U=Ulow | U=Ulow | - |
| #A6 | #A6 | - | - | - | - |
| #A7 | #A7 | - | - | - | - |
| #A8 | #A8 | - | - | - | - |
| #A9 | #A9 | - | - | - | - |
| #A10 | #A10 | - | - | - | - |
| #A11 | #A11 | Rear and center heated oxygen sensor (HO2S), signal (-) | - | - | Center heated oxygen sensor (HO2S): certain markets only. Not measured. |
| #A12 | #A12 | Misfire signal | - | - | Pulse width modulation (PWM) signal |
| #A13 | #A13 | Fuel pressure sensor, power supply 5 V | U =5 V | - | - |
| #A14 | #A14 | - | - | - | - |
| #A15 | #A15 | Throttle position (TP) sensor, power supply 5 V | U =5 V | - | - |
| #A16 | #A16 | Manifold absolute pressure (MAP) sensor, power supply 5V | U =5 V | - | - |
| #A17 | #A17 | Intake camshaft position (CMP) sensor, power supply 5 V | U =5 V | - | - |
| #A18 | #A18 | - | - | - | - |
| #A19 | #A19 | Intake camshaft position (CMP) sensor, signal ground | U=Ulow | U=Ulow | - |
| #A20 | #A20 | Knock sensor (KS), signal (-) | U=Ulow | - | - |
| #A21 | #A21 | Engine speed (RPM) sensor, signal (-) | U=2.5 V | U = sine wave voltage Utop =5 V Uoffset = 2.5 V |
Measure to terminal #A62 (#A62). The voltage and the frequency increase with engine speed |
| #A22 | #A22 | Engine coolant temperature (ECT) sensor, signal ground | U=Ulow | U=Ulow | - |
| #A23 | #A23 | Mass air flow (MAF) sensor, signal ground | U=Ulow | U=Ulow | - |
| #A24 | #A24 | Throttle position (TP), signal ground | U=Ulow | U=Ulow | - |
| #A25 | #A25 | - | - | - | - |
| #A26 | #A26 | - | - | - | - |
| #A27 | #A27 | - | - | - | - |
| #A28 | #A28 | - | - | - | - |
| #A29 | #A29 | - | - | - | - |
| #A30 | #A30 | - | - | - | - |
| #A31 | #A31 | - | - | - | - |
| #A32 | #A32 | - | - | - | - |
| #A33 | #A33 | - | - | - | - |
| #A34 | #A34 | Ignition coil cyl 4, control signal | U=Ulow | - | The frequency increases with engine speed (RPM) |
| #A35 | #A35 | Ignition coil cyl 5, control signal | U=Ulow | - | The frequency increases with engine speed (RPM) |
| #A36 | #A36 | - | - | - | - |
| #A37 | #A37 | - | - | - | - |
| #A38 | #A38 | - | - | - | - |
| #A39 | #A39 | Exhaust camshaft position (CMP) sensor, power supply 5V | U=5 V | - | - |
| #A40 | #A40 | - | - | - | - |
| #A41 | #A41 | - | - | - | - |
| #A42 | #A42 | - | - | - | - |
| #A43 | #A43 | Exhaust camshaft position (CMP) sensor, signal ground | U=Ulow | U=Ulow | - |
| #A44 | #A44 | - | - | - | - |
| #A45 | #A45 | - | - | - | - |
| #A46 | #A46 | Knock sensor (KS), signal (+) | U=Ulow | - | - |
| #A47 | #A47 | Front heated oxygen sensor (HO2S), signal (+) | - | - | Not measured. |
| #A48 | #A48 | Front heated oxygen sensor (HO2S), signal (-) | - | - | Not measured. |
| #A49 | #A49 | Rear heated oxygen sensor (HO2S), preheating, control signal | - | Utop =12 V, pulse ratio 30-60% | Pulsed 12 V signal. |
| #A50 | #A50 | Center heated oxygen sensor (HO2S), preheating, control signal | - | Utop =12 V, pulse ratio 30-60% | Pulsed 12 V signal. Certain markets only. |
| #A51 | #A51 | - | - | - | - |
| #A52 | #A52 | - | - | - | - |
| #A53 | #A53 | 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. |
| #A54 | #A54 | - | - | - | - |
| #A55 | #A55 | - | - | - | - |
| #A56 | #A56 | - | - | - | - |
| #A57 | #A57 | - | - | - | - |
| #A58 | #A58 | Ignition coil cyl 1, control signal | U=Ulow | - | The frequency increases with engine speed (RPM) |
| #A59 | #A59 | Ignition coil cyl 2, control signal | U=Ulow | - | The frequency increases with engine speed (RPM) |
| #A60 | #A60 | Ignition coil cyl 3, control signal | U=Ulow | - | The frequency increases with engine speed (RPM) |
| #A61 | #B1 | - | - | - | - |
| #A62 | #B2 | Engine speed (RPM) sensor, signal (+) | U=2.5 V | U=sine wave voltage Utop =5 V Uoffset =2.5V | Measured to terminal #A21 (#A21). The frequency increases with engine speed |
| #A63 | #B3 | 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) |
| #A64 | #B4 | 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) |
| #A65 | #B5 | - | - | - | - |
| #A66 | #B6 | - | - | - | - |
| #A67 | #B7 | 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. |
| #A68 | #B8 | Rear heated oxygen sensor (HO2S), signal (+) | - | - | Not measured. |
| #A69 | #B9 | Manifold absolute pressure (MAP) sensor, signal | U≈2 V | U<≈2 V | U increases with higher air pressure |
| #A70 | #B10 | Mass air flow (MAF) sensor, signal | U=1 V | U≈1.7 V | U increases with increasing air mass |
| #A71 | #B11 | Fuel pressure sensor, signal fuel temperature | U≈ 0.5 V-4.5 V | U≈ 0.5 V-4.5 V | U drops with increased fuel temperature. The fuel temperature sensor is integrated in the fuel pressure sensor. |
| #A72 | #B12 | Throttle position (TP) sensor circuit 2, signal | U ≈ 0.4 - 4.5 V | U ≈ 0.4 - 4.5 V | The voltage varies depending on the position of the throttle. U decreases with increasing throttle opening. |
| #A73 | #B13 | - | - | - | - |
| #A74 | #B14 | Throttle unit motor, control signal (-) | - | PWM signal Utop =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 damper motor is controlled using a pulse width modulation (PWM) signal from the integrated power stage in the engine control module (ECM) measured to terminal #A75 (#B15) |
| #A75 | #B15 | Throttle unit motor, control signal (+) | - | PWM signal Utop =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 damper motor is controlled using a pulse width modulation (PWM) signal from the integrated power stage in the engine control module (ECM) measured to terminal #A74 (#B14) |
| #A76 | #B16 | Front heated oxygen sensor (HO2S), preheating, control signal | - | Utop =12 V, pulse ratio 30-60% | Pulsed 12 V signal |
| #A77 | #B17 | - | - | - | - |
| #A78 | #B18 | Reset valve camshaft intake (VVT), control signal | PWM-signal Utop =Ubat f=250 Hz (±12.5 Hz) | % duty varies depending on control. | - |
| #A79 | #B19 | - | - | - | - |
| #A80 | #B20 | Injector no. 5, control signal | U = Ubat | t=2-3 ms | t increases with engine speed (RPM) and load |
| #A81 | #B21 | Injector no. 4, control signal | U = Ubat | t=2-3 ms | t increases with engine speed (RPM) and load |
| #A82 | #B22 | Injector no. 3, control signal | U = Ubat | t=2-3 ms | t increases with engine speed (RPM) and load |
| #A83 | #B23 | Injector no. 2, control signal | U = Ubat | t=2-3 ms | t increases with engine speed (RPM) and load |
| #A84 | #B24 | Injector no. 1, control signal | U = Ubat | t=2-3 ms | t increases with engine speed (RPM) and load |
| #A85 | #B25 | - | - | - | - |
| #A86 | #B26 | - | - | - | - |
| #A87 | #B27 | - | - | - | - |
| #A88 | #B28 | LIN A (Local Interconnect Network), Alternator Control Module (ACM), Premair sensor. | - | - | Alternator Control Module (ACM): MY 2005- only. Premair sensor: MY 2006- and certain markets only. |
| #A89 | #B29 | - | - | - | - |
| #A90 | #B30 | - | - | - | - |
| #A91 | #B31 | 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 . |
| #A92 | #B32 | - | - | - | - |
| #A93 | #B33 | Mass air flow (MAF), 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 mass air flow (MAF) sensor. |
| #A94 | #B34 | Fuel pressure sensor, signal fuel pressure | 480 +/- 5 kPa (absolute pressure) U = 1.8 - 2 V | The voltage increases with higher fuel pressure. | |
| #A95 | #B35 | Center heated oxygen sensor (HO2S), signal (+) | - | - | Not measured. Certain markets only. |
| #A96 | #B36 | Throttle position (TP) sensor circuit 1, signal | U ≈ 0.4 - 4.5 V | U ≈ 0.4 - 4.5 V | U varies depending on the position of the throttle. U increases with increased throttle opening. |
CONNECTOR B
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #B1 | #C1 | Power ground 1 | Ulow | - | Ground terminal, connected to the chassis at the right-hand suspension turret |
| #B2 | #C2 | Power ground 2 | Ulow | - | Ground terminal, connected to the chassis at the right-hand suspension turret |
| #B3 | #C3 | Power ground 3 | Ulow | - | Ground terminal, connected to the chassis at the right-hand suspension turret |
| #B4 | #C4 | Power supply from the system relay | Ubat | - | Power supply 12 V engine control module (ECM) from the system relay. |
| #B5 | #C5 | - | - | - | - |
| #B6 | #C6 | Power supply from the system relay | Ubat | - | Power supply 12V engine control module (ECM) from the system relay. |
| #B7 | #C7 | Engine cooling fan control module, control signal | - | - | PWM signal to the engine cooling fan control module |
| #B8 | #C8 | Starter relay, control signal (-) | - | - | - |
| #B9 | #C9 | - | - | - | - |
| #B10 | #C10 | A/C relay, control signal | - | - | Air conditioning (A/C) relay activated: U=Ulow Air conditioning relay not activated: U = Ubat |
| #B11 | #C11 | - | - | - | - |
| #B12 | #C12 | - | - | - | - |
| #B13 | #C13 | - | - | - | - |
| #B14 | #C14 | - | - | - | - |
| #B15 | #C15 | Transmission control module, signal gear position | With engaged: U=Ulow With disengaged: U=Ubat | - | Grounded in the Transmission Control Module at. |
| #B16 | #C16 | 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". |
| #B17 | #C17 | Start, signal 50-supply | - | - | Signal from the ignition switch. The cable is shared with the central electronic module (CEM). When the ignition is in position for start: U=Ulow |
| #B18 | #C18 | - | - | - | - |
| #B19 | #C19 | - | - | - | - |
| #B20 | #C20 | Fuel pump control module, control signal | - | PWM signal pulse ratio 50% (+/-10%) engine at operating temperature | PWM signal transmitted by the engine control module (ECM) to the fuel pump control module. The pulse ratio varies with the requested fuel pressure. |
| #B21 | #C21 | - | - | - | - |
| #B22 | #C22 | - | - | - | - |
| #B23 | #C23 | Leak diagnostic unit, preheating, control signal | - | - | Heating element activated: U=Ulow Heating element not activated: U=Ubat Only certain markets. |
| #B24 | #C24 | - | - | - | - |
| #B25 | #C25 | - | - | - | - |
| #B26 | #C26 | Accelerator pedal (AP) position sensor, PWM signal | PWM signal Utop =Ubat t=5 ms pulse ratio≈ 6-90% | PWM signal Utop =Ubat t=5 ms pulse ratio≈ 6-14% | The PWM signal from the accelerator pedal (AP) position sensor to the engine control module (ECM). The pulse ratio increases as the accelerator pedal (AP) is depressed. |
| #B27 | #C27 | - | - | - | - |
| #B28 | #C28 | Air conditioning (A/C) low pressure switch, signal | - | - | High air conditioning (A/C) pressure: U=Ubat Low air conditioning A/C pressure: U=Ulow |
| #B29 | #C29 | - | - | - | - |
| #B30 | #C30 | Power supply (Wake up, 15-supply) | 12V | 12V | - |
| #B31 | #C31 | A/C high pressure sensor, power supply | - | - | - |
| #B32 | #C32 | - | - | - | - |
| #B33 | #C33 | Leak diagnostic unit, pump motor, power supply | Pump motor running: U=Ulow Pump motor not running: U=Ubat | - | Certain markets only. |
| #B34 | #C34 | - | - | - | - |
| #B35 | #C35 | - | - | - | - |
| #B36 | #C36 | - | - | - | - |
| #B37 | #C37 | - | - | - | - |
| #B38 | #C38 | - | - | - | - |
| #B39 | #C39 | - | - | - | - |
| #B40 | #C40 | - | - | - | - |
| #B41 | #C41 | 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). |
| #B42 | #C42 | - | - | - | - |
| #B43 | #C43 | - | - | - | - |
| #B44 | #C44 | HS-CAN L, transmission control module (TCM) | - | - | - |
| #B45 | #C45 | HS-CAN L | - | - | Connected to #B58 (#C58) (HS-CAN H) via terminating resistor. |
| #B46 | #C46 | Leak diagnostic unit, valve, control signal | - | - | Valve activated: U=Ulow Valve not activated: U=Ubat Only certain markets. |
| #B47 | #C47 | A/C high pressure sensor, signal ground | U=Ulow | - | - |
| #B48 | #C48 | - | - | - | - |
| #B49 | #C49 | - | - | - | - |
| #B50 | #C50 | - | - | - | - |
| #B51 | #C51 | A/C high pressure sensor, signal | - | - | The voltage increases with increased pressure |
| #B52 | #C52 | - | - | - | - |
| #B53 | #C53 | - | - | - | - |
| #B54 | #C54 | Power supply, engine control module (ECM) (terminal 30) | - | - | - |
| #B55 | #C55 | - | - | - | - |
| #B56 | #C56 | - | - | ||
| #B57 | #C57 | HS-CAN H, transmission control module (TCM) | - | - | - |
| #B58 | #C58 | HS-CAN H | - | - | Connected to #B45 (#C45) (HS-CAN L) via terminating resistor. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.