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Home >> Infiniti >> 2011 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case (ATX90A)) >> DTC/Circuit Diagnosis >> DTC P1820: Engine Speed Signal >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

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DTC DETECTION LOGIC

DTC Display item Malfunction detected condition Possible cause
P1820 ENGINE SPEED SIG Malfunction is detected in engine speed signal that is output from ECM through CAN communication.
  • Harness or connector (CAN communication line)
  • Internal malfunction of ECM
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