LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2001 >> Jimmy 2D Utility, RWD, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> Diagnostic Tests >> DTC P0463: Fuel Level Signal High >> Diagnostic Procedure

Diagnostic Procedure

  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, observe FUEL TANK LEVEL REMAINING parameter in PCM data list. If parameter indicates greater than 99 percent, go to next step. If parameter does not indicate greater than 99 percent, system is functioning properly at this time. Check system for intermittent conditions. See DIAGNOSTIC AIDS  .
  3. Turn ignition switch to OFF position. Disconnect connector C104. Connect a fused jumper wire (3-amp) between fuel level sender signal circuit terminal "E" (Purple wire) and low reference circuit terminal "D" (Orange/Black wire on 2.2L engines, Black wire on 4.3L engines). See Figure . Turn ignition switch to ON position. Using scan tool, observe FUEL TANK LEVEL REMAINING parameter in PCM data list. If parameter indicates less than one percent, go to step  6 . If parameter does not indicate less than one percent, go to next step.
  4. Check signal circuit of fuel level sender between fuel sender unit and PCM. On 2.2L engines, check Purple wire between fuel level sender connector terminal No. 2 and PCM connector C1 terminal No. 55. See Figure and Figure . See WIRING DIAGRAMS  . On 4.3L engines, check Purple wire between fuel level sender connector terminal "A" and PCM connector C2 terminal No. 54. See Figure andFigure . See WIRING DIAGRAMS  . On all models, check circuit for open, high resistance or short to voltage. Repair wiring as necessary, then go to step  12 . If no problem is found, go to next step.
  5. Check low reference circuit between fuel level sender unit and PCM. On 2.2L engines, check Orange/Black wire between fuel level sender connector terminal No. 4 and PCM connector C1 terminal No. 6. See WIRING DIAGRAMS  . On 4.3L engines, check Black/White wire between fuel level sender unit connector terminal "D" and connector C104 terminal "D", then check Black wire between connector C104 terminal "D" and PCM connector C1 terminal No. 23. See Figure . See WIRING DIAGRAMS  . On all models, check circuit for open or high resistance. Repair wiring as necessary, then go to step  12 . If no problem is found, go to step  9 .
  6. Check signal circuit between connector C104 and fuel level sender. On 2.2L engines, check Purple wire between connector C104 terminal "E" and fuel level sender connector terminal No 2. See Figure andFigure . See WIRING DIAGRAMS  . On 4.3L engines, check Purple wire between connector C104 terminal "E" and fuel level sender connector terminal "A". See Figure . See WIRING DIAGRAMS  . On all models, check circuit for open, high resistance or short to voltage. Repair wiring as necessary, then go to step  12 . If no problem is found, go to next step.
  7. Check ground circuit between fuel level sender and connector C104. On 2.2L engines, check Orange/Black wire between fuel level sender terminal No 4 and connector C104 terminal "D". See WIRING DIAGRAMS  . On 4.3L engines, check Black/White wire between fuel level sender connector terminal "D" and connector C014 terminal "D". See WIRING DIAGRAMS  . On all models, check circuit for open or high resistance. Repair circuit as necessary, then go to step  12 . If no problem is found, go to next step.
  8. Check fuel level sender connector for poor connections and corroded terminals. Repair connection as necessary, then go to step  12 . If no problem is found, go to step  10 .
  9. Check PCM connector for poor connections and corroded terminals. Repair connection as necessary, then go to step  12 . If no problem is found, go to step  11 .
  10. Replace fuel level sender unit. See REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to step  12 .
  11. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to next step.
  12. Using scan tool, clear DTCs. Turn ignition switch to ON position and scan for PCM DTCs. If DTC P0463 resets, go to step  2 . If DTC does not reset, repair is complete.
scientia non olet · About LEMON Manuals