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.
2008 Volvo V70FACTORY OEM SERVICE PROCEDURE
Signal Specification
All values indicated below are between respective connection in column 1 and #A9 (#39 on the breakout box). If this is not the case, it is indicated within brackets.
Connector A (16-pin) corresponds to #31 - #46 on the breakout box.
Connector B (22-pin to transmission) corresponds to #1 - #22 on the breakout box.
NOTE:
Connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | battery voltage | F = | frequency in Hertz (Hz) |
| Ulow = | voltage approximately 0 V | %duty = | duty cycle (pulse ratio) as a percentage (%) |
| t = | time in milliseconds (ms) |
Connector A
CONNECTOR A, #A31 - #A46
| Connection breakout box | Connection control module | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #31 | #A1 | Voltage feed | Ubat | 30-feed from fuse | |
| #32 | #A2 | - | - | - | |
| #33 | #A3 | - | - | - | |
| #34 | #A4 | - | - | - | |
| #35 | #A5 | Signal, start lockout | Ulow when start is permitted | Signal to engine control module (ECM) if start is permitted | |
| #36 | #A6 | Communication cable control module CAN_L | During communication the voltage is 1.5 - 2.5 V | - | |
| #37 | #A7 | Communication cable LIN gear selector module (GSM) | During communication the voltage is 0 V - Ubat | - | |
| #38 | #A8 | Communication cable K-line | - | For serial communication | |
| #39 | #A9 | Power ground | U = Ulow | - | |
| #40 | #A10 | - | - | - | |
| #41 | #A11 | Voltage feed | U = Ubat | 15-feed from ignition via fuse | |
| #42 | #A12 | - | - | - | |
| #43 | #A13 | Signal, Shift lock solenoid for gear selector module (GSM) | Shift lock U = Ubat when the solenoid is not activated Ulow when the solenoid is activated |
Solenoid not activated = gear selector locked Solenoid activated = gear selector can be moved |
|
| #44 | #A14 | Communication cable, control module CAN_H | During communication the voltage is 2.0 - 3.5 V | - | |
| #45 | #A15 | - | - | - | |
| #46 | #A16 | Voltage feed, gear selector module (GSM) | U = Ubat | - | |
Connector B
CONNECTOR B, #B1 - #B22
| Connection breakout box | Connection control module | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #1 | #B1 | Signal ground, linear pressure solenoid SLT | U = Ulow | - | |
| #2 | #B2 | Control signal, shift solenoid S2 | Activated: U = 0 - 2 V below Ubat Not activated: Ulow |
The solenoid receives voltage when transmission control module (TCM) activates it during engine braking in 1st gear. | |
| #3 | #B3 | Control signal, linear pressure solenoid SLT | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #4 | #B4 | Signal ground Lock-up solenoid SLU | U = Ulow | - | |
| #5 | #B5 | Control signal, shift solenoid S1 | Activated: U = 0 - 2 V below Ubat Not activated: Ulow |
The solenoid receives voltage when transmission control module (TCM) activates it during engine braking in 1st gear. | |
| #6 | #B6 | - | - | - | |
| #7 | #B7 | Signal ground, oil temperature sensor | Ulow | Ground | |
| #8 | #B8 | Signal, oil temperature sensor | Cold transmission (+20°C): U = 2.4 V Warm transmission (+100°C): U = 0.3 - 0.5 V |
U decreases with increasing temperature. | |
| #9 | #B9 | Control signal, lock-up solenoid SLU | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #10 | #B10 | Signal ground, linear pressure solenoid SLC1 | U = Ulow | - | |
| # 11 |
#B11 | Control signal, lock-up solenoid SLC1 | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #12 | #B12 | Voltage feed, RPM sensor (VSS) | Power supply, RPM sensor ≈ 1-3 V < Ubat |
- | |
| #13 | #B13 | Signal, RPM sensor | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
When the toothed wheel rotates, the sensor generates a pulsating current (square wave) with fixed pulse ratio, the frequency increases with the speed. | |
| #14 | #B14 | Control signal, linear pressure solenoid SLC3 | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #15 | #B15 | - | - | - | |
| #16 | #B16 | Signal ground, linear pressure solenoid SLB1 | U = Ulow | - | |
| #17 | #B17 | Control signal, linear pressure solenoid SLC2 | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #18 | #B18 | Signal ground, linear pressure solenoid SLC2 | U = Ulow | - | |
| #19 | #B19 | Voltage feed, speed sensor | Power supply, speed sensor ≈ 1-3 V < Ubat | - | |
| #20 | #B20 | Signal, speed sensor | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
When the toothed wheel rotates, the sensor generates a pulsating current (square wave) with fixed pulse ratio, the frequency increases with the speed. | |
| #21 | #B21 | Control signal, linear pressure solenoid SLB1 | f = 300 Hz. Frequency is constant, regardless of driving conditions. It is the signal's duty cycle that is modified when the system pressure is adapted. | The solenoid receives voltage when transmission control module (TCM) activates it. | |
| #22 | #B22 | Signal ground, linear pressure solenoid SLC3 | U = Ulow | - | |
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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