14.09.2005: Saab NG900 ECU Replacement

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14.09.2005: Saab NG900 ECU Replacement

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ECU (engine control unit) replacement on a 1996 900 turbo. The original ECU is being replaced with an upgraded unit from Nordic.

Tools:

10 mm socket: bolt under the glovebox;
Torx T25 screwdriver: glovebox and ECU screws.

14.09.2005: Glovebox

Remove the glovebox -- six screws around the perimeter and one 10 mm bolt below by the door.

14.09.2005: Connector

Pull the glovebox out, unplug the bulb connector.

14.09.2005: Harness

Before removing the ECU, disconnect the battery or pull the "Trionic" fuse (#28). Move the carpeting away. Unlock ECU harness by pulling the lever and unplug it. Undo a screw in the lower right corner. The ECU slides down.

14.09.2005: ECUs

The new ECU plugs right in. After the installation, perform an adaptation run by doing a series of full throttle accelerations in high gear from 2000 to 4500 RPM. It helps if you can find a long road going uphill.

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