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P-bus and I-bus

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.

The P-bus and I-bus are connected to the CIM and ICM. The buses are electrically isolated. The P-bus has a data transfer rate of 500 kbits/s and the I-bus of 33 kbits/s. The data rate on the P-bus is high to allow the powertrain systems access to information with the shortest possible delay, for example during air mass compensation when the selector lever is moved from N to D or torque limitation during gear changes.

Information on the P-bus is transferred between control modules on two leads: bus + (green lead) and bus - (white lead). The leads are twisted to reduce their sensitivity against electrical interference. The I-bus only has one lead.

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