P1793 – Engine Speed Signal (Nissan)

Description

The ECM detected an abnormal engine speed signal sent to the TCM.

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Symptoms

  • Harsh shifting
  • Limp mode

Causes

  • Crank sensor fault
  • Wiring issue
  • ECM error

Diagnosis

  • Check crank sensor
  • Inspect wiring
  • Scan ECM data

Repair

  • Replace sensor
  • Repair wiring