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Home >> Buick >> 1995 >> Park Avenue Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM/Pcm Code Charts >> Code P1558, Cruise System Problem SPS Indicated Low >> Test Description
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Test Description

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks servo position sensor. If signal is not being received at PCM, use Code P1565 to diagnose problem.
  2. Verifies vacuum portion of cruise system is operational.
  3. Checks for faulty brake switch.
Fig 1: Code P1558 Schematic (3.8L) Cruise System Problem SPS Indicated Low
G95A13870
Fig 2: Code P1558 Diagnostic Flow Chart (3.8L) Cruise System Problem SPS Indicated Low
G95H13869