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Home >> Saab >> 1985 >> 900 S, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Non-Turbo >> Lambda Control System Checks >> Preparation For Checks

Preparation For Checks

  1. Frequency valve is operated by pulsating voltage from ECU. By measuring this signal, mixture function of system can be tested and changed. High-quality dwell meter may be used on all other models.
  2. Connect dwell meter to 2-wire testing connector. Connector is to left of fuse and relay panel.
  3. The color-coded wire should be connected to positive (+) lead of dwell meter. Other wire in connector is ground and should be connected to negative (-) lead of dwell meter. Set dwell meter on 4-cylinder scale. Start engine and run until warm.
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