DTC 51: Injector (CALIF.)

1. Search For Malfunctioning Circuit
   
   Using a listening device, search for circuit which does not produce injector operating sound at idle. See Fig 1 .
2. Search For Malfunctioning Circuit Using CONSULT
   
   Perform POWER BALANCE in ACTIVE TEST mode. Search for circuit which does not produce a momentary engine speed drop.
3. Check Circuit Continuity I
   
   Turn ignition off. Disconnect EFI sub-harness connectors (Brown and Gray connectors). See Fig 2 . Verify harness continuity between Brown connector (injector side) terminal "E" (Red/Black wire) and Gray connector terminals "I" (Pink/Black wire), "J" (White wire), "K" (Light Green/Black wire), "L" (Yellow wire), "O" (Gray wire) and "P" (Red/Blue wire). See Fig 3 . If continuity is not present, go to n ext step. If continuity is present, go to step 6).
4. Check Circuit Continuity II
   
   Disconnect injector harness connectors. See Fig 4 . Verify harness continuity between Brown connector (injector side) terminal "E" and each injector harness connector terminal "R" (Red/Black wire). Verify harness continuity between each injector terminal "Q" and Gray connector terminals "I" (Pink/Black wire), "J" (White wire), "K" (Light Green/Black wire), "L" (Yellow wire), "O" (Gray wire) and "P" (Red/Blue wire). See Fig 5 .
5. Check Component
   
   Inspect each injector. See SYSTEM/COMPONENT TESTS article. Replace injector(s) if necessary.
6. Check Output Signal Circuit
   
   Turn ignition off. Disconnect ECM harness connector. Verify harness continuity between ECM harness connector terminals and ECM side of EFI Gray connector terminals as follows:
   • ECM terminal No. 101 and EFI terminal "S" (Yellow wire).
   • ECM terminal No. 103 and EFI terminal "U" (White wire).
   • ECM terminal No. 105 and EFI terminal "W" (Red/Blue wire).
   • ECM terminal No. 110 and EFI terminal "T" (Light Green/Black wire).
   • ECM terminal No. 112 and EFI terminal "V" (Pink/Black wire).
   • ECM terminal No. 114 and EFI terminal "X" (Gray wire).

See Fig 6 . If continuity is not present, repair harness or connectors as necessary. If continuity is present, inspect ECM pin terminals for damage or check for bad connection of ECM harness connector. Perform FINAL CHECK  .

Fig 1: DTC 51, Checking For Injector Operating Sound (J30)

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

Fig 2: Locating EFI Harness Connectors (J30)

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

Fig 3: DTC 51, Checking Circuit Continuity I (J30)

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

Fig 4: Locating Injector Harness Connector (J30)

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

Fig 5: DTC 51, Checking Circuit Continuity II (J30)

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

Fig 6: DTC 51, Checking Output Signal Circuit Continuity (J30)

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