DTC 13: Engine Coolant Temperature (ECT) Sensor

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.

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.

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.

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.

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)

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

Fig 2: DTC 13, Checking Power Supply I (Q45)

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

Fig 3: DTC 13, Checking Ground Circuit I (Q45)

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

Fig 4: Locating ECT Sensor (Q45)

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

Fig 5: DTC 13, Checking Power Supply II (Q45)

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

Fig 6: DTC 13, Checking Ground Circuit II (Q45)

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