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 the SYSTEM/COMPONENT TESTS article. 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.