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Home >> Cadillac >> 1993 >> Allante >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Ignition Systems >> Chart 6D4-3: Ignition Control Check >> Notes On Fault Tree

Notes On Fault Tree

NOTE: Numbers in list refer to circled numbers in diagnostic flow chart.
  1. CKT 424 is the BYPASS circuit and should be low at key ON.
  2. CKT 423 is the IGNITION CONTROL circuit and should be low with the ICM not receiving crankshaft position sensor pulses.
  3. CKT 424, BYPASS circuit, should be high with engine running.
Fig 1: Ignition Control Check Flow Chart
G00060928Courtesy of GENERAL MOTORS CORP.
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