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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 P0500: Vehicle Speed Sensor (VSS) Circuit ("Y" 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.
    CAUTION: Support lower control arms so drive axles are in normal horizontal position or drive axles will be damaged.
  2. Turn ignition off. Raise and support drive axles. Disable ASR/TCS system (if equipped). Start engine. With engine at idle, place transmission in 2nd gear and slowly release clutch. Slowly bring engine speed to 1500 RPM and hold. Using scan tool, monitor vehicle speed. If displayed vehicle speed is greater than 15 MPH, see DIAGNOSTIC AIDS . If displayed vehicle speed is not greater than 15 MPH, go to next step.
  3. Turn ignition off. Disconnect VSS harness connector. Connect Signal Generator Tester (J-33431-B) to VSS harness. Using a DVOM in AC volt scale, connect Black DVOM lead to VSS pin "A" terminal. Connect Red DVOM lead to VSS pin "B" terminal. Start engine. Place transmission in 2nd gear and slowly release clutch. Slowly bring engine speed to 1500 RPM and hold. If DVOM indicates a voltage reading of greater than 1.2 volts, go to next step. If DVOM does not indicate a voltage reading of greater than 1.2 volts, go to step  9.
  4. Turn ignition off. Using a test light connected to battery voltage, probe VSS low circuit (terminal "A"). If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  5. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using DVOM, check voltage between VSS high circuit (terminal "B") and a known-good ground. If voltage reading is greater than.2 volt, go to step  7. If voltage reading is not greater than.2 volt, go to next step.
  6. Check VSS high circuit (terminal "A") for open or short to ground. Repair as necessary. After repairs, go to step  8. If circuit is okay, go to step  11.
  7. Repair short to voltage in VSS high circuit. After repairs, go to step  12.
  8. Repair open or high resistance in VSS high circuit. After repairs, go to step  12.
  9. Replace VSS. After replacing sensor, go to step  12.
  10. Repair open in VSS low circuit. After repairs, go to step  12.
  11. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  12. Using scan tool, select DTC, CLEAR INFO function. 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, repeat step  2.
  13. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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