Signal Description. Transmission Control Module (TCM)
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
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 at idling speed | Other |
|---|---|---|---|---|---|
| #A35 | #A35 | Power supply | Ubat | Supply from fuse 11B2 | |
| #A37 | #A37 | Signal, oil temperature sensor (OT) | 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 (SP1) | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
The sensor generates a pulsed signal (quadratic wave) with a fixed pulse ratio when the pulse wheel rotates. Frequency increases with speed | |
| #A41 | #A41 | Signal, engine speed (RPM) sensor (SP2) | Tooth against sensor: 14 mA Cover against sensor: 7 mA |
The sensor generates a pulsed signal (quadratic wave) with a fixed pulse ratio when the pulse wheel rotates. Frequency increases with speed | |
| #A45 | #A45 | Signal, gear-shift position sensor C | Gear selector positions D, 4, 3 and L: U=0-0.5 V Other positions: U=0-2 V below Ubat |
The signal is grounded in positions D, 4, 3 and L | |
| #A46 | #A46 | Signal, gear-shift position sensor A | Gear selector position P, R, 4, 3: U=0-0.5 V Other positions: U=0-2 V below Ubat |
The signal is grounded in positions P, R, 4, and 3 | |
| #A47 | #A47 | Control signal, shift solenoid S4 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid receives voltage when activated by the control module in 3rd, 4th and 5th gears | |
| #A48 | #A48 | Control signal, shift solenoid S3 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid is supplied with voltage when activated by the control module in 1st, 2nd and 3rd gears | |
| #A49 | #A49 | Control signal, line pressure solenoid SLS | U=1.6 V | Voltage decreases with increasing throttle opening | |
| #A50 | #A50 | Control signal, shift solenoid S1 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid is supplied with voltage when activated by the control module in 1st gear | |
| #A51 | #A51 | Control signal, lock-up solenoid SLU | 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 SLT | U=1.6 V | The solenoid receives voltage when it is activated by the transmission control module (TCM) | |
| #A53 | #A53 | Signal ground | Ulow | To ground terminal 31/71, front right side member | |
| #A54 | #A54 | Signal ground | Ulow | To ground terminal 31/71, front right side member | |
| #A55 | #A55 | Signal ground, oil temperature sensor (OTG) | Ulow | Ground | |
| #A57 | #A57 | Power supply, vehicle speed sensor (SP1) | U≈1 V <Ubat | - | |
| #A59 | #A59 | Power supply, engine speed (RPM) sensor (SP2) | U≈1 V <Ubat | - | |
| #B3 | #A63 | Signal, gear-shift position sensor PA | Gear selector position P, N, 4, L: U=0-0.5 V Other positions: U=0-2 V below Ubat |
The signal is grounded in positions P, N, 4, and L | |
| #B4 | #A64 | Signal, gear-shift position sensor B | Gear selector position R, N, D, 3: U=0-0.5 V Other positions: U=0-2 V below Ubat |
Signal grounded in positions R, N, D, 3 | |
| #B6 | #A66 | Control signal, shift solenoid S5 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid is supplied with power when activated by the control module in 2nd and 3rd gears | |
| #B7 | #A67 | Signal ground, line pressure solenoid (SLSG) | f=300 Hz Frequency is constant, independent of driving conditions. The signal duty cycle is modified when line pressure is adapted | - | |
| #B8 | #A68 | Control signal, shift solenoid S2 | Activated: U=0-2 V below Ubat Not activated: Ulow |
The solenoid is supplied with voltage when activated by the control module in 1st and 5th gears | |
| #B9 | #A69 | Signal ground, lock-up solenoid (SLUG) | f=300 Hz Frequency is constant, independent of driving conditions. The signal duty cycle is modified when line pressure is adapted | - | |
| #B10 | #A70 | Signal ground, throttle solenoid (SLTG) | 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 at idling speed | Other |
|---|---|---|---|---|---|
| #B11 | #B1 | Communication cable control modules (CAN) | 2-3 V | Between the transmission control module (TCM) and engine control module (ECM) | |
| #B12 | #B2 | Communication cable control modules (CAN) | 2-3 V | Between the transmission control module (TCM) and the driver information module | |
| #B23 | #B13 | Communication cable control modules (CAN) | 2-3 V | Between the transmission control module (TCM) and engine control module (ECM) | |
| #B24 | #B14 | Communication cable control modules (CAN) | 2-3 V | Between the transmission control module (TCM) and the driver information module | |
| #B31 | #B21 | Communication cable | - | Between the transmission control module (TCM) and the gear selector lever mode selector | |
| #B32 | #B22 | Diagnostic lead C-link | - | OBDII | |