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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0506: Idle Speed Low >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and allow ECT to reach at least 176°F (80°C). Using scan tool, perform the following procedure using ENGINE SPEED CONTROL special function while monitoring ENGINE SPEED. Command 1600 RPM and hold for 5 seconds. Command 1000 RPM and hold for 5 seconds. Command 600 RPM and hold for 5 seconds. If ENGINE SPEED matches COMMANDED RPM within 100 RPM, problem is intermittent. See DIAGNOSTIC AIDS  . If ENGINE SPEED does not match COMMANDED RPM within 100 RPM, go to next step.
  2. Check the following for possible causes:
    • System voltage out of range.
    • Carbon around throttle plate/bore.
    • Mechanical engine load.
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