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Home >> Jeep >> 1990 >> Wagoneer >> Repair and Diagnosis >> Engine Performance >> System >> Ignition System Tests - 4.0L >> Testing >> Sync Pulse Signal Generator (Stator) Test
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Sync Pulse Signal Generator (Stator) Test

NOTE: For this test, an analog voltmeter MUST be used.
  1. Insert the positive (+) lead of the voltmeter into the Blue wire at the distributor connector.
  2. Insert the negative (-) voltmeter lead into the Gray/White wire at the distributor oonnector.
    CAUTION: DO NOT  remove the distributor connector from distributor. Insert the voltmeter leads into the backside of the distributor connector to make contact with the terminals.
  3. Set the voltmeter to the 15-Volt A/C scale. Turn ignition key to "ON".
  4. The voltmeter should display approximately 5.0 volts.
  5. If no voltage displays, check that the voltmeter leads are making good contact. If there is still no voltage, go to next step.
  6. Remove the ECU and check for voltage at pin "C-16" and ground with harness connected. If there in still no voltage, proceed to the next step.
  7. Connect Diagnostic Tester M.S. 1700 to the vehicle. Using the diagnostic tester, perform vehicle test. If voltage is present, go to the next step.
  8. Check for continuity between the Blue wire at the distributor connector and pin C-16 at the ECU.
  9. If there in no continuity, repair harness as necessary.
  10. Check Sor continuity between the Gray/White wire at the distributor connector and pin C-5 at the ECU.
  11. If there is no continuity, repair harness as necessary.
  12. Check for continuity between the Black wire at the distributor connector and ground.
  13. If there is no continuity, repair harness as necessary.
  14. While observing the voltmeter, crank the engine; the voltmeter needle should fluctuate back and forth while the engine in cranking. A fluctuation verifies that the stator in the distributor is operating properly.
  15. If there is no pulse sync, replace the stator. Refer to REMOVAL & INSTALLATION  .
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