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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P0506 or P0507 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. With a scan tool, compare the Desired Idle Speed to the Engine Speed. Both engine speed parameters should be within 50 RPM of each other.
  2. Elevate the engine speed in 25 RPM increments to 1300 RPM using a scan tool. With each commanded increment, the actual Engine Speed should stay within 25 RPM of the commanded speed.
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