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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
  • No communication with the generic electronic module (GEM)
  • Central junction box (CJB) fuse(s):
    • 7 (15A).
    • 39 (5A).
    • 43 (20A).
  • Battery junction box (BJB) fuse 12 (40A).
  • Circuitry.
  • GEM.
  • No communication with the instrument cluster
  • Central junction box (CJB) fuse(s):
    • 11 (15A).
    • 21 (5A).
    • 34 (20A).
  • Circuitry.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Incorrect fuel gauge indication
  • Circuitry.
  • Fuel pump module.
  • Instrument cluster.
  • Incorrect oil pressure gauge indication
  • Circuitry.
  • Engine oil pressure switch.
  • Instrument cluster.
  • Incorrect temperature gauge indication
  • Circuitry.
  • Engine coolant temperature sensor.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Incorrect voltage gauge indication - except Cobra
  • Circuitry.
  • Generator.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Incorrect tachometer indication
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Incorrect boost gauge indication - Cobra only
  • Pressure line.
  • Instrument cluster.
  • The LOW FUEL warning indicator is never/always on
  • LOW FUEL warning indicator bulb.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Oil gauge reads normal with engine off
  • Instrument cluster.
  • INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER  . TEST the system for normal operation.
  • The speedometer is inoperative
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • The odometer is inoperative
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • The safety belt warning indicator is inoperative (chime is operative)/does not operate correctly
  • Circuitry.
  • Generic electronic module (GEM).
  • Instrument cluster.
  • Inaccurate speedometer reading
  • Instrument cluster.
  • Powertrain control module (PCM).
  • The O/D OFF indicator is never on
  • Circuitry.
  • O/D cancel switch.
  • O/D OFF indicator bulb.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • The O/D OFF indicator is always on
  • Circuitry.
  • O/D cancel switch.
  • Powertrain control module (PCM).
  • The CHECK FUEL CAP INDICATOR is never on
  • Circuitry.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • The CHECK FUEL CAP INDICATOR is always on
  • Circuitry.
  • Powertrain control module (PCM).
  • Fuel system.
  • The BRAKE warning indicator is never/always on
  • Circuitry.
  • Low brake fluid level.
  • Brake fluid level switch.
  • Parking brake switch.
  • Instrument cluster.
  • Generic electronic module (GEM).
  • The charging system warning indicator is never/always on
  • Circuitry.
  • Generator.
  • Charging system warning indicator bulb.
  • Instrument cluster.
  • The high beam indicator is never/always on
  • Circuitry.
  • High beam indicator bulb.
  • Instrument cluster.
  • The air bag warning indicator is never/always on
  • Circuitry.
  • Air bag warning indicator bulb.
  • Instrument cluster.
  • Restraint control module (RCM).
  • The anti-lock brake system (ABS) warning indicator is never on
  • Circuitry.
  • ABS warning indicator bulb.
  • Anti-lock brake control module.
  • Instrument cluster.
  • The ABS warning indicator is always on
  • Circuitry.
  • Anti-lock brake control module.
  • The SERVICE ENGINE SOON indicator is never/always on
  • Circuitry.
  • SERVICE ENGINE SOON indicator bulb.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • The turn/hazard indicator is never/always on
  • Circuitry.
  • Turn/hazard bulb(s).
  • Instrument cluster.
  • The THEFT indicator is never/always on
  • Circuitry.
  • THEFT indicator LED.
  • Instrument cluster.
  • The traction control indicator is never/always on
  • Circuitry.
  • Traction control switch.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • ABS module.
  • Instrument cluster.
  • The integrated circuit display is inoperative/erratic
  • Instrument cluster.
  • The instrument cluster is inoperative
  • Central junction box (CJB) fuse(s):
    • 11 (15A).
    • 21 (5A).
    • 34 (20A).
  • Circuitry.
  • Instrument cluster.
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