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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC P0500 - Vehicle Speed Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Clear DTCs. Using Connector Test Kit (J 35616-A), backprobe signal and ground circuits of VSS connector. Raise vehicle wheels and place engine in operating gear. Check voltage with voltmeter on 200-volt AC scale. If voltage is constant, go to step 5). If voltage is not constant, go to next step.
  3. If voltage varies, see DIAGNOSTIC AIDS. If voltage does not vary, go to next step.
  4. If voltmeter indicates no voltage, go to step 11). If voltmeter does not indicate no voltage, go to step 12).
  5. Turn ignition off. Disconnect VSS connector. With vehicle still raised, engine operating, transmission in gear and voltmeter on 200-volt AC scale, check voltage between VSS connector terminals. If voltage varies with RPM, go to step 7). If voltage does not vary with RPM, go to next step.
  6. Replace VSS. After replacing sensor, go to step 12).
  7. Check for poor connections at VCM and VSS. If a problem is found, go to step 9). If no problem is found, go to next step.
  8. Check for open or short in VSS signal and ground circuits. If a problem is found, go to step 10). If no problem is found, go to step 12).
  9. Repair connections. After repairs, go to step 12).
  10. Repair open or short. After repairs, go to step 12).
  11. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  12. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the 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. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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