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OBD II Fault Code P1031 :

Description of OBD II Fault code P1031

FUEL HEATER CIRCUIT MALFUNCTION

Possible failuer of OBD II Fault code P1031

  • Fuel Heater Relay (Contact stuck ON)
  • Fuel Heater High-side harness (Short to power or open)
  • Fuel Heater Low-side harness (Open or short to ground)
  • Power Distribution Detection harness (Short to power or open)
  • Power Distribution Detection unit fuse blown

Diagnostic Procedure using AutoHex auto Scan tool tester

  • The High level (12 V) of the Fuel Heater return signal is detected with the OFF direction output of the Fuel Heater Relay for a set period of time.

Test Conditions using AutoHex Scan tool tester

  • During the OFF direction output of the Fuel Heater
  • The battery voltage > 10500 mV

Clear Fault codes Conditions

  • The High level (12 V) of the Fuel Heater return signal is detected with the OFF direction output of the Fuel Heater Relay for a set period of time.

MIL Status

  • Glow ON


Note:

  • AutoHex is a professional OBD /OBD II diagnostic scanner / scan tool tester.
  • This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
    To get the accurate fault code description you may use AutoHex OBD scanner

More OBD II Fault codes:

OBD II Fault Code P1032
OBD II Fault Code P1033
OBD II Fault Code P1034
OBD II Fault Code P1035
OBD II Fault Code P1036
OBD II Fault Code P1037
OBD II Fault Code P1038
OBD II Fault Code P1039
OBD II Fault Code P103A
OBD II Fault Code P103B
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