2) Check Ground Circuit

If engine does not start, turn ignition off. Disconnect Power Transistor Unit (PTU) harness connector. Verify harness continuity between PTU harness connector terminal "d" (Black wire) and engine ground. See Fig 1 -19. If continuity is present, go to step 4). If continuity is not present, repair harness or connectors as necessary and perform FINAL CHECK.

Fig 1: Locating Ignition Coil Relay

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

Fig 2: Locating Ignition Coil Harness Connector

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

Fig 3: Locating Power Transistor Unit Harness Connector

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

Fig 4: Locating EFI Harness Connectors

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

Fig 5: DTC 21, Checking Ground Circuit

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