DTC 13: Engine Coolant Temperature (ECT) Sensor

Check Power Supply

Turn ignition off and disconnect ECT sensor harness connector. Turn ignition on. Measure voltage between ECT sensor harness connector terminal "b" (Blue/Orange 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.

Fig 1: Locating ECT Sensor Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: DTC 13, Checking Power Supply
Courtesy of NISSAN MOTOR CO., U.S.A.

Check Ground Circuit

Turn ignition off. Check ECT sensor harness continuity between terminal "a" (Black wire) and engine ground. See Fig 3 . If continuity is present, go to next step. If continuity is not present, verify harness continuity between ECT sensor and ECM. Repair harness or connectors as necessary.

Check Component

Inspect ECT sensor. See SYSTEM & COMPONENT TESTING article. Replace ECT sensor if necessary and perform FINAL CHECK.

Fig 3: DTC 13, Checking Ground Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.