Points to remember

WARNING: This page is about a different variant/trim than selected.

Observe the test conditions, use your common sense when judging the readings obtained.
The specified readings are with the ignition in position ON unless stated otherwise.
First check that the control module is supplied with current and grounded.
Then check all sensor inputs and signals from other systems.
Finally, check the control module outputs. Remember that the readings do not indicate whether the actuator is in working order.
If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which ought to be checked more thoroughly.
The specified test readings refer to those obtained with a calibrated Fluke 88/97.
All readings are with warm engine/gearbox.

Test readings %(+) and ms(+) indicate the signal's pulse ratio and pulse duration. A test instrument capable of measuring pulse ratio and pulse width must be used. The sign denotes a positive trigger pulse, TRIG+.

Fig 1: Identifying Control Module Connector Pinouts

Courtesy of SAAB-SCANIA OF AMERICA, INC.

TRANSMISSION CONTROL MODULE TEST READINGS SPECIFICATIONS

Cable colour

Component/Function

In/Out

Test conditions

Test between

Test reading

See

YE/GY

Battery voltage (+15 circuit)

Ignition ON Ignition OFF

1-B+

< 0.5 V 12 V

WH/BK

Solenoid, Lock-up (SL)

Out

Activate with diagnostic tool
Lock-Up solenoid

2-32

12 V or 0 V

No connection

BK/GN

Solenoid 2-3 (S2)

Out

Gear D
Winter mode ON
Winter mode OFF

4-32

0 V 12 V

No connection

BK/BU

NTC sensor for transmission fluid temperature

20°C
50°C
80°C

6-32

2.3 V
1.7 V
1.0 V

BN/OG

Switch, SPORT

Switch depressed
Switch not activated

7-32

0 V
12 V

No connection

GN/RD

Engine speed
Connected but not used

BH/WH

Idling speed compensation Drive signal

Out

Gear lever N
From N to D, 3, 2, 1
From N to R

10-32

0 V
12 V
12 V

BU/GY

CHECK GEARBOX warning lamp

Out

Activate with diagnostic tool
Check Gearbox ON
Check Gearbox OFF
or
With ignition ON and lamp lit

11-1

12 V
0 V
12 V for 3 s

GN/WH

SPORT indicator lamp

Out

Activate with diagnostic tool
Sport lamp:
Sport lamp ON
Sport lamp OFF

12-1

12 V
0 V

VT/WH

Gear selector position sensor, pin A

Selector lever P, R, 3, 2
Selector lever N, D, 1

13-32

12 V
0 V

Gear selector position sensor, pin C

Selector lever D, 3, 2, 1
Selector lever P, R, N

14-32

12 V
0 V

RD/BU

Inductive sensor, output shaft speed

Engine ON
Raise the car, engage 1st gear and run it at 20 km/h ⁽¹⁾

15-30

1.1 V~
190 Hz

RD/WH

Battery voltage (+30 circuit)

Ignition ON/OFF

16-B+

< 0.5 V

WH/GN

Pressure control solenoid (ST) Current supply

Out

Activate with diagnostic tool
Pressure control solenoid

17-18

4.3 V
or
0.7 V

Pressure control solenoid (ST)
Current feedback

Activate with diagnostic tool
Pressure control solenoid

18-34

0.3 V
or
0.1 V

BK/VT

Solenoid 1- 2/3-4 (S1)

Out

Gear D
Winter mode ON
Winter mode OFF

19-32

12 V
0 V

No connection

BU/YE

Data link K

In/Out

Diagnostic tool connected
Diagnostic tool disconnected

21-32

10 V
0 V

BU/YE

Switch, WINTER

Switch depressed
Switch not activated

22-32

0 V
12 V

No connection

RD/WH

WINTER control lamp

Out

Activate with diagnostic tool
Winter lamp:
Winter lamp ON
Winter lamp OFF

27-1

12 V
0 V

Gear selector position sensor, pin B

Selector lever R, N, D, 3
Selector lever P, 2, 1

28-32

12 V
0 V

WH/YE

Gear selector position sensor, pin D

Selector lever P, N, 3, 1
Selector lever R, D, 2

29-32

12 V
0 V

Ground, signal ground for inductive sensor

30-B-

< 0.1 V

Ground

31-B-

< 0.1 V

Ground

35-B-

< 0.1 V

No connection

Brake light switch

Brakes applied
Brakes not applied

36-32

12 V
0 V

Kickdown switch

Accelerator pedal depressed
Accelerator pedal inactive

37-32

0 V
12 V

No connection

2500+/-50 rpm

2.0 V
100 Hz
15% (+)
1.5 ms (+)

Starter motor cranking

0.25-1.
0 V
100 Hz
2-8.2% (+)
0.2-0.82 ms (+)

No connection

Ground, signal ground for inductive sensor

44-B-

< 0.1 V

YE/BK

Inductive sensor, input shaft speed

Idling speed

45-30

1.2-1.4 V~
160-200 Hz

2500 rpm

2.2 V~500 Hz

⁽¹⁾	The vehicle speed can be read using the diagnostic tool, menu "Read values" and "Output speed".