Power supply, ground and bus communication
WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
PINS DESCRIPTION
| Pin no. | Type of signal | Description |
|---|---|---|
| 2(A) and 19(A) | Power supply, (+15 circuit) | From fuse 4 in the front electrical center |
| 3(A) and 20(A) | Power supply, (+30 circuit) | From fuse 2 in the front electrical center |
| 47(A), 57 (A), 60(A) and 63(A) | Ground | Grounding point G7 |
| 5(A) | P-bus + | Signal to/from other control modules |
| 6(A) | P-bus - | Signal to/from other control modules |
The Trionic T8 control module has a 70-pin connector.
The control module is continuously supplied with +30 current on pin 3(A) and 20(A), and will lose its adapted values and stored trouble codes if it loses power.
The control module is adapted to a voltage between 8-16V when driving.
After turning on the ignition, the control module will be activated and turn on the CHECK ENGINE lamp as a function check. The fuel pump relay is activated for 1 second to build up pressure and then, the control module will wait for pulses from the crankshaft position sensor.