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Home >> Chevrolet >> 2000 >> Venture Base, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1635: 5-Volt Reference "A" Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using a DVOM, check voltage between ground and 5-volt reference circuit. If voltage reading is about 5 volts, go to step  5. If voltage reading is not about 5 volts, go to next step.
  3. Using DVOM, observe voltage while disconnecting all components connected to the 5-volt reference circuit one at a time. If voltage changes when one of the components is disconnected, go to step  8. If voltage does not change when one of the components is disconnected, go to next step.
  4. If voltage reading is less than 4.9 volts, go to step  6. If voltage reading is not less than 4.9 volts, go to step  7.
  5. Reconnect component(s) that were disconnected earlier. Check another 5-volt reference circuit. If voltage reading is about 5 volts, go to step  9. If voltage reading is not about 5 volts, go to step  8.
  6. Check all 5-volt reference "A" circuits for short to ground. Repair as necessary. After repairs, go to step  10. If circuits are okay, go to step  9.
  7. Check all 5-volt reference "A" circuit for short to voltage. Repair as necessary. After repairs, go to step  10. If circuits are okay, go to step  9.
  8. Replace affected component(s). After replacing component(s), go to step  10.
  9. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  10. Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for this DTC until DTC test runs. If scan tool indicates that this DTC failed this ignition, go to step  2. If scan tool does not indicate that this DTC failed this ignition, system is okay.
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