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Home >> Chevrolet >> 2000 >> Camaro Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0656: Fuel Level Output Circuit (Grand PRIX) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Diagnose instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After diagnosing instrument cluster, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a DVOM, check voltage between ground and fuel level output circuit. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  7.
  4. Set DVOM to 10-amp scale. Check current between ground and affected PCM output circuit. Observe reading for at least 2 minutes. If current reading is 0.1-1.5 amps, go to step  12. If current reading is not 0.1-1.5 amps, go to next step.
  5. Disconnect instrument cluster harness connector. Leave PCM disconnected. Check voltage between ground and fuel level output circuit. If voltage reading is zero volts, go to step  15. If voltage reading 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 repairs, go to step  17.
  9. Disconnect instrument cluster. Turn ignition on. Check voltage between ground and ignition feed circuit. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, 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 circuit for poor connection at instrument cluster or PCM. Repair as necessary. After repairs, go to step  17. If connections are okay, go to step  15.
  12. Turn ignition off. Leave PCM disconnected. Turn ignition on, with engine off. Using a fused jumper wire, connect jumper wire between ground and fuel level output circuit for about 30 seconds. Check fuel gauge. If gauge reads EMPTY, go to next step. If gauge does not read EMPTY, see DIAGNOSTIC AIDS .
  13. Check fuel level output control circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  17. If connection is okay, go to step  16.
  14. Repair open in ignition feed circuit to instrument cluster indicator lights. 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. Operate vehicle within conditions for setting this DTC. If DTC resets, go to step  3. If DTC does not reset, system is okay.
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