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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> DTC P2100, P2103 Throttle Control Motor Relay >> On Board Diagnosis Logic

On Board Diagnosis Logic

These self-diagnoses have the one trip detection logic  .

DTC DETECTING CONDITION CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2100
2100		 Throttle control motor relay circuit open ECM detects that the voltage of power source for throttle control motor is excessively low.
  • Harness or connectors

    (Throttle control motor relay circuit is open)

  • Throttle control motor relay
P2103
2103		 Throttle control motor relay circuit short ECM detects that the throttle control motor relay is stuck ON.
  • Harness or connectors

    (Throttle control motor relay circuit is shorted)

  • Throttle control motor relay

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL illuminates.

FAIL-SAFE CHART

Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
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