Points to remember

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.

CONTROL MODULE TESTING REFERENCE

Cable color

Component/Function

In/Out

Test conditions

Test between

Test reading

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".