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.
   Fig 1: Locating EFI Sub-Harness Connector No. 2

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

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

   Courtesy of NISSAN MOTOR CO., U.S.A.
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 - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Replace ECT sensor if necessary and perform FINAL CHECK.

Fig 4: Locating ECT Sensor

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

Fig 5: DTC 13, Checking Power Supply II

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

Fig 6: DTC 13, Checking Ground Circuit II

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