Check Input Signal Circuit

Turn ignition off. Disconnect ECM harness connector and A/T control unit harness connector. Verify harness continuity between ECM connector terminal No. 5 and A/T control unit connector terminal No. 10 (Blue/Black wire). Verify harness continuity between ECM connector terminal No. 14 and A/T control unit connector terminal No. 11 (Pink/Blue wire). See Fig 1 and Fig 2 . If continuity is present, perform FINAL CHECK  . If continuity is not present, check connectors between ECM and A/T control unit. Repair harness or connectors as necessary and perform FINAL CHECK  .

Fig 1: Locating A/T Control Unit Connector (J30)

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

Fig 2: DTC 54, Checking Input Signal Circuit (J30)

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