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Home >> Chevrolet >> 1998 >> Camaro Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - 3.8L >> Diagnostic Trouble Codes >> DTC P1653 - Fuel Level Output Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Diagnose instrument cluster system. Repair as necessary. See INSTRUMENT PANEL article in ACCESSORIES/SAFETY EQUIPMENT section. If instrument cluster is okay, go to next step.
  3. Turn ignition off. Disconnect PCM connector. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector fuel level signal circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 7).
  4. Using DVOM in 10-amp scale, check current between engine ground and affected PCM output circuit. Monitor reading for 2 minutes. If current remains between 0.05-1.50 amps, go to step 12). If current does not remain between 0.05-1.50 amps, go to next step.
  5. Turn ignition off. Disconnect instrument panel cluster harness connector. Leave PCM connector disconnected. Turn ignition on. Using DVOM, check voltage between engine ground and fuel level output circuit. If voltage is zero volts, go to step 15). If voltage is not zero volts, go to next step.
  6. Locate and repair short to voltage in affected PCM output circuit. After repairs, go to step 17).
  7. Check ignition feed fuse for instrument cluster. If fuse is blown, go to next step. If fuse is okay, go to step 9).
  8. Locate and repair short to ground in ignition feed circuit for instrument panel cluster. Replace fuse. After replacing fuse, go to step 17).
  9. Turn ignition off. Disconnect instrument cluster connector. Turn ignition on. Check voltage between ground and instrument cluster ignition feed circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 14).
  10. Check fuel level control circuit for open or short to ground. Repair as necessary. After repairs, go to step 17). If circuit is okay, go to next step.
  11. Check fuel level control circuit and ignition feed circuits for faulty connection at instrument panel cluster. Repair as necessary. After repairs, go to step 17). If connection is okay, go to step 15).
  12. Turn ignition on. Connect a fused jumper wire to fuel level output circuit and touch other end of jumper wire to ground for about 30 seconds. If fuel gauge reads EMPTY, go to next step. If fuel gauge does not read EMPTY, see DIAGNOSTIC AIDS.
  13. Check fuel level output control circuit for faulty connection at PCM. Repair as necessary. After repairs, go to step 17). If connection is okay, go to step 16).
  14. Locate and repair open ignition feed circuit instrument cluster indicator lights. Repair as necessary. After repairs, go to step 17).
  15. Replace instrument cluster. After replacing instrument cluster, go to step 17).
  16. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  17. Using scan tool, operate affected indicator light. If indicated indicator light illuminates, system is okay. If affected indicator light does not illuminate, repeat step 3).
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