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Home >> Infiniti >> 1995 >> Q45 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes 4.5L >> Diagnostic Trouble Code (DTC) Testing >> DTC 13: Engine Coolant Temperature (ECT) Sensor
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DTC 13: Engine Coolant Temperature (ECT) Sensor

  1. Check Power Supply I

    Turn ignition off and disconnect EFI sub-harness connector No. 2. Turn ignition on. Measure voltage between EFI sub-harness connector No. 2 terminal "d" (Yellow/Black wire) and ground. See Fig 1 and Fig 2 . If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.

  2. Check Ground Circuit I

    Turn ignition off. Check EFI sub-harness No. 2 continuity between terminal "a" (Black/Yellow wire, with TCS; Black wire, without TCS) and engine ground. See Fig 3 . If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

  3. Check Power Supply II

    Connect EFI sub-harness No. 2 connector. Disconnect ECT harness connector. Turn ignition on. Measure voltage between ECT harness connector terminal "h" (Yellow/Black wire) and ground. See Fig 4 and Fig 5 . If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.

  4. Check Ground Circuit II

    Turn ignition off. Check ECT harness continuity between terminal "g" (Black wire) and engine ground. See Fig 6 . If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

  5. Check Component

    Inspect ECT sensor. See I - SYSTEM/COMPONENT TESTS article. Replace ECT sensor if necessary and perform FINAL CHECK  .
Fig 1: Locating EFI Sub-Harness Connector No. 2 (Q45)
G94G44145Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC 13, Checking Power Supply I (Q45)
G93G78580Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: DTC 13, Checking Ground Circuit I (Q45)
G93H78581Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: Locating ECT Sensor (Q45)
G93I78582Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 5: DTC 13, Checking Power Supply II (Q45)
G93A78584Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 6: DTC 13, Checking Ground Circuit II (Q45)
G93B78585Courtesy of NISSAN MOTOR CO., U.S.A.
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