DTC 13: Engine Coolant Temperature (ECT) Sensor

1. Check Power Supply
   
   Turn ignition off and disconnect ECT sensor harness connector. Turn ignition on. Measure voltage between ECT sensor harness connector terminal "b" (Yellow/Green 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, verify harness continuity between ECT sensor and ECM. Repair harness or connectors as necessary.
2. Check Ground Circuit
   
   Turn ignition off. Check ECT sensor harness continuity between terminal "a" (Orange/Blue wire) and engine ground. See Figure . If continuity is present, go to next step. If continuity is not present, verify harness continuity between ECT sensor terminal "a" and ECM terminal No. 30 (Orange/Blue wire), and between automatic transmission control unit terminal No. 35 (48-pin connector located on driver side kick panel) and ECT sensor terminal "a" (Orange/Blue wire). Repair harness or connectors as necessary.
3. Check Component
   
   Inspect ECT sensor. See SYSTEM/COMPONENT TESTS article. Replace ECT sensor if necessary and perform FINAL CHECK  .

Fig 1: Locating ECT Sensor Harness Connector (J30)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: DTC 13, Checking Power Supply (J30)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: DTC 13, Checking Ground Circuit (J30)

Courtesy of NISSAN MOTOR CO., U.S.A.