LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 1996 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0506 - Idle System Low, IAC Responding >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Start engine. Using scan tool, command RPM between 500 to 1500 RPM. Repeat 2 times and exit from test. If RPM change responded to within 50 RPM of each command, see DIAGNOSTIC AIDS. If RPM does not respond as commanded, go to next step.
  3. If engine RPM was too high (greater than 50 RPM of desired RPM), go to next step. If RPM did not change significantly, go to step 5).
  4. Check for vacuum leaks, throttle plates not closing properly or for faulty PCV valve. Repair as necessary. After repairs, go to step 6).
  5. Check for excessive deposits in throttle body. Check for parasitic load on engine (i.e. transmission problem). Repair as necessary. After repairs, go to next step.
  6. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0506. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool did not indicate that this test ran and passed, repeat step 2).
  7. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
scientia non olet · About LEMON Manuals