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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0506: Idle Speed Low ("F" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Start engine. Using scan tool, command RPM from 500 RPM up to 1500 RPM, then 1500 RPM to 500 RPM. Repeat 2 times and exit from test. If RPM change responded to within 100 RPM of each command, see DIAGNOSTIC AIDS . If RPM does not respond as commanded, go to next step.
  3. If engine speed is greater than 100 RPM greater than desired RPM, go to next step. If engine speed is not greater than 100 RPM greater than desired RPM, 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  11. If no problem is found, 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 step  11. If no problem is found, go to next step.
  6. Turn ignition off. Disconnect IAC harness connector. Install appropriate IAC test light (included in Kit J-37027-A). Start engine and allow it to idle. Using scan tool, command RPM up to 1500 RPM, down to 500 RPM, and then up to 1500 RPM while observing test light. If both LEDs cycle Red and Green, but never OFF, go to next step. If test light does not react as specified, go to step  8.
  7. Turn ignition off. Remove IAC valve. Connect IAC valve to IAC driver tool (included in Kit J-37027-A). Hold IAC valve with a finger over pintle to prevent overextension. Using driver tool, retract and extend pintle. If pintle moves steadily with each flash of test light, go to step  9. If operation is not as specified, go to step  10.
  8. Check IAC harness for faulty connections, shorts to battery voltage or ground, or opens. Repair as necessary. After repairs, go to step  13. If harness is okay, go to step  11.
  9. Check IAC passages for blockages or heavy deposits. Repair as necessary. After repairs, go to step  13. If passages are okay, go to next step.
  10. Replace IAC valve. After replacing IAC valve, go to step  13.
  11. Check for faulty PCM connections. Repair as necessary. After repairs, go to step  13. If connections are okay, go to next step.
  12. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. 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 does not indicate that this test ran and passed, go to  2.
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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