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Home >> Saab >> 1984 >> 900 S, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Ignition System - BOSCH Hall Effect >> Testing >> System Check - With Spark

System Check - With Spark

  1. If spark occurred in SYSTEM SPARK CHECK , turn control unit around grounded bolt until fuse is visible from side. Pull back rubber cover from fuse, but do not remove fuse.
  2. Connect voltmeter positive lead to terminal 4 and negative lead to terminal 2. Turn ignition on. Battery voltage should be read. If not, check wiring to battery.
  3. If battery voltage was present, check ignition coil primary and secondary resistance in same manner as for Audi and Volkswagen models. If not to specification, replace ignition coil.
    IGNITION COIL RESISTANCE SPECIFICATION

    Application Primary Secondary
    Saab .52-.76 2400-3500
  4. If coil resistance is satisfactory, remove coil wire from distributor. Connect voltmeter positive lead to terminal 15 and negative lead to terminal 1 of ignition coil.
  5. Turn ignition switch on. The voltmeter should drop from 6 volts to zero (0) volts within 1-2 seconds. If not, replace control unit. If so, engine should start.
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