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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - Tests W/Codes - 7.4L (P Series)) >> Diagnostic Trouble Codes >> DTC P0506 - Idle System Low Rpm (IAC Responding) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 7.4L article. After performing OBD system check, go to next step.
  2. Install scan tool. Check if any other DTCs are set. If other DTCs are not set, go to next step. If other DTCs are set, go to that DTC test.
  3. Check if DTC P0506 is active this ignition cycle. If DTC P0506 is active this ignition cycle, go to step 5). If DTC P0506 is not active this ignition cycle, go to next step.
  4. DTC is intermittent. See DIAGNOSTIC AIDS.
  5. Problem is engine mechanical related. Repair as necessary. After repairs, go to step 7).
  6. Using scan tool, clear codes. Start engine. Idle at operating temperature. Select SPECIFIC DTC for DTC P0506. Operate vehicle under conditions which originally set DTC. If scan tool indicates DTC test has run and passed, go to next step. if not, go to step 2).
  7. Using scan tool, select CAPTURE INFO function. Review stored info. If other DTCs are stored, go to applicable DTC. If not, system is okay.
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