2004 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature Sensor

  1. Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.
    Fig 1: Checking Resistance Between Engine Coolant Temperature Sensor Terminals 1 & 2
    G02691244Courtesy of NISSAN MOTOR CO., U.S.A.
    REFERENCE DATA

    Engine coolant temperature Β°C (Β°F) Voltage(1) V Resistance kΞ©
    20 (68) 3.5 2.1 - 2.9
    50(122) 2.2 0.68 - 1.00
    90(194) 0.9 0.236 - 0.260
    (1) This data is reference value and is measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.
  2. If NG, replace engine coolant temperature sensor.
    Fig 2: DTC P0117, P0118 ECT Sensor - Temperature/Resistance Graph
    G02691245Courtesy of NISSAN MOTOR CO., U.S.A.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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