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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 - Without Spark

System Check - Without Spark

  1. If there was no spark in SYSTEM SPARK CHECK , test high tension part of ignition system.
  2. Coil wire resistance should be 500-1500 ohms. Spark plug wire resistance should be 2000-4000 ohms. Distributor rotor resistance should be 1000 ohms.
  3. Recheck for spark across spark plug gap to ground. If spark occurs, turn the control unit around the grounded bolt until fuse is visible from side. Pull back rubber cover from fuse, but do not remove the fuse.
  4. 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.
  5. If voltage is correct, unplug distributor connector. Check voltage at connector's positive and negative terminals. Battery voltage should be read. If not, check wiring to control unit. If wiring okay, replace control unit.
  6. If battery voltage was present, connect voltmeter positive lead to control unit terminal 6 and negative lead to terminal 3. Remove distributor cap and dust cover. Turn crankshaft so shutter blades are outside Hall switch.
  7. Turn ignition switch on. Voltage should be about .4 volt. If so, turn engine over until shutter blades enter Hall switch gap. Voltage should now be 1 volt or more. If readings are as specified, replace distributor.
  8. If voltage in step 7) was correct, perform steps 3) through 6) of SYSTEM CHECK - WITH SPARK .
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