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Home >> Chevrolet >> 1998 >> Venture Base, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1626 - Theft Deterrent System Fuel Enable Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Ensure battery is fully charged. Attempt to start engine. If engine cranks, go to next step. If engine does not crank, see ANTI-THEFT SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section.
  3. Turn ignition off. Disconnect VTD module. Turn ignition on. Using DVOM, measure voltage between ground circuit and fuel enable circuit at VTD module harness connector. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step 6).
  4. Turn ignition off. Reconnect VTD module connector. Turn ignition on. Backprobing connector, measure frequency between ground and fuel enable circuit terminal at VTD module connector. If frequency is 40-60 Hz, go to next step. If frequency is not 40-60 Hz, go to step 8).
  5. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTC P1626. Attempt to start engine. If engine starts and continues to run, see DIAGNOSTIC AIDS. If engine does not start or starts but does not continue to run, go to step 7).
  6. Check for an open, short to ground or short to voltage in fuel enable circuit. Repair as necessary. After repairs, go to step 11). If circuit is okay, go to next step.
  7. Check fuel enable circuit for poor terminal connection at PCM connector. Repair as necessary. After repairs, go to step 11). If connection is okay, go to step 9).
  8. Check for poor terminal connections at VTD module connector. Repair as necessary. After repairs, go to step 11). If terminals are okay, go to step 10).
  9. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 11).
  10. Replace VTD module. After repair is completed, go to next step.
  11. Using scan tool, CLEAR INFO or CLEAR DTCS function to clear DTC P1554. Using scan tool, select ENG 2 data list. Observe VTD FUEL DISABLE display. If reading indicates inactive, repair is complete. If reading does not indicate inactive, repeat step 2).
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