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Home >> Chevrolet >> 2002 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> Diagnostic Tests >> DTC P0608: Vehicle Speed Output Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  . After performing IPC diagnostic 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 wheels. Start engine and allow to idle. Place gear selector into gear. Allow engine to idle in gear. If speedometer does not indicate any speed, go to next step. If speedometer indicates any speed, see DIAGNOSTIC AIDS  .
  3. Turn ignition off. Locate and disconnect PCM connector C2. See Figure . Turn ignition on. Using DVOM, measure voltage between ground and PCM connector C2 terminal No. 21 (Yellow wire). See Figure . If voltage is less than 9.6 volts, go to next step. If voltage is more than 9.6 volts, go to step  6 .
  4. Check for open, short to ground or high resistance in Yellow wire between VSS and PCM. Repair as necessary. After repairs, go to step  9 . If circuit is okay, go to next step.
  5. Check for poor connections at IPC connector. Repair as necessary. After repairs, go to step  9 . If connections are okay, go to step  8 .
  6. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  9 . If connections are okay, go to next step.
  7. Replace PCM. See POWERTRAIN CONTROL MODULE  . After replacing PCM, go to step  9 .
  8. Replace IPC. See INSTRUMENT PANEL CLUSTER  . After repairs, go to next step.
  9. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If DTC does not reset, system is okay. If DTC resets, go to step  2 .
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