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Home >> Saab >> 1983 >> 900 S, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System - BOSCH Hall Effect >> System 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 switch "ON." Battery voltage should be read. If not, check wiring back to battery.
  3. If battery voltage was present, check ignition coil primary and secondary resistance in same manner as for Audi and Volkswagen models.
  4. Primary resistance should be .52-.76 ohms. Secondary resistance should be 7,000-9,000 ohms. If not to specification, replace ignition coil.
  5. 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.
  6. 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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