B1775

Gear position sensor faulty

Fault symptom
No gear position displayed.
Incorrect gear position displayed.

Action
1 Connect the Intelligent Saab Tester (ISAT), select "READ VALUES" and study the transmission range switch values.
The ISAT shows voltage on the sensor in question. This should be ON 0 V or OFF 12 V.
Select read "SELECTOR LEVER POS". The display shows the gear selected.
Check that the ISAT display corresponds to the selected transmission range switch, see table.
If all signals are OFF 12 V, see point 2.
If individual signals are faulty, see point 3.
2 Check the lead between transmission range switch connector pin 1 and grounding point G14.
3 Check the cable assembly from Electronic Display Unit (EDU) control module connector pins 18, 19 and 20 to transmission range switch connector pins 2, 3 and 4 for open/short circuits.
4 If the fault remains, change the transmission range switch.

Pin
18 19 20
A B C

Transmission range

P ON 0 V OFF 12 V OFF 12 V
R ON 0 V ON 0 V OFF 12 V
N OFF 12 V ON 0 V OFF 12 V
D OFF 12 V ON 0 V ON 0 V
3 ON 0 V ON 0 V ON 0 V
2 ON 0 V OFF 12 V ON 0 V
1 OFF 12 V OFF 12 V ON 0 V
Manual gearbox OFF 12 V OFF 12 V OFF 12 V


OFF 12 V = open circuit
ON 0 V = closed circuit