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.
2006 Volvo S80 AWDFACTORY OEM SERVICE PROCEDURE
Signal description, Transmission Control Module (TCM)
All values contained below are between the terminal in column 1 and #A53 (signal ground), unless otherwise indicated in brackets.
NOTE:
It is important to connect the breakout box and check 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 #A35 - #A70
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #A35 | #A35 | Power supply | Ubat | Supply from fuse 16 in the integrated relay/fusebox in the engine compartment | |
| #A37 | #A37 | Signal, oil temperature sensor | Cold transmission (+20°C): U=2.4 V Hot transmission (+100°C): U=0.3-0.5 V |
U decreases with increasing temperature | |
| #A39 | #A39 | Signal, vehicle speed sensor (VSS) | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
The sensor generates a pulsed signal (quadratic wave) with fixed pulse ratio when the pulse wheel rotates. Frequency increases with speed | |
| #A41 | #A41 | Signal, transmission speed sensor | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
The sensor generates a pulsed signal (quadratic wave) with fixed pulse ratio when the pulse wheel rotates. Frequency increases with speed | |
| #A45 | #A45 | Signal, gear-shift position sensor C | Gear selector position D, 3, L: U=0-0.5 V Other positions: U=0-2 V below Ubat |
Signal grounded in positions D, 3, L | |
| #46 | #A46 | Signal, gear-shift position sensor A | Gear selector position P, R, 3, L: U=0-0.5 V Other positions: U=0-2 V below Ubat |
Signal grounded in positions N, D | |
| #A50 | #A50 | Control signal, shift solenoid S1 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid receives a signal when activated by the transmission control module (TCM) it is in 2nd and 3rd gears | |
| #A51 | #A51 | Control signal, lock up solenoid SL | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid receives voltage when it is activated by the transmission control module (TCM) | |
| #A52 | #A52 | Control signal, line pressure solenoid STH | U=1.6 V | Voltage decreases with increasing throttle opening | |
| #A53 | #A53 | Signal ground (SG) | Ulow | - | |
| #A55 | #A55 | Signal ground oil temperature sensor (OTG) | Ulow | Ground | |
| #A57 | #A57 | Power supply, vehicle speed sensor (VSS) | U≈1 V | - | |
| #A59 | #A59 | Power supply, engine speed (RPM) sensor | U≈1 V | - | |
| #B3 | #A63 | Signal, gear-shift position sensor PA | Gear selector position P, N, 3: U=0-0.5 V Other positions: U=0-2 V below Ubat |
Signal grounded in positions P, N, 3 | |
| #B4 | #A64 | Signal, gear-shift position sensor B | Gear selector position R, N, D, 3, L: U=0-0.5 V Other positions: U=0-2 V below Ubat |
Signal grounded in positions R, N, D, 3 | |
| #B8 | #A68 | Control signal, shift solenoid S2 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid receives voltage when activated by the transmission control module (TCM) in 1st and 2nd gears | |
| #B10 | #A70 | Signal ground, line pressure solenoid STH | f=300 Hz Frequency is constant, independent of driving conditions. The signal duty cycle is modified when line pressure is adapted | - | |
Connector B #B1 - #B22
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| #B11 | #B1 | Communication cable control modules (Control area network(CAN)) | 2-3 V | Between transmission control module (TCM) and engine control module (ECM) | |
| #B12 | #B2 | Communication cable control modules (Control area network(CAN)) | 2-3 V | Between transmission control module (TCM) and ABS control unit and also central electronic module (CEM) | |
| #B23 | #B13 | Communication cable control modules (Control area network(CAN)) | 2-3 V | Between transmission control module (TCM) and engine control module (ECM) | |
| #B24 | #B14 | Communication cable control modules (Control area network(CAN)) | 2-3 V | Between transmission control module (TCM) and ABS control unit and also central electronic module (CEM) | |
| #B31 | #B21 | Communication cable VULCANO light |
- | Between transmission control module (TCM) and gear selector module (GSM) | |
| #B32 | #B22 | Diagnosis cable K-link | - | - | |
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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