2003 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Injector Circuits (Altima 3.5L)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step  3. If engine does not start, go to step  4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step  9. If engine does not perform as specified, go to step  4.
  3. Start engine and listen to each fuel injector. If every injector clicks, go to step  9. If any injector does not click, go to next step
  4. Turn ignition off. Disconnect suspect fuel injector 2-pin harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 1 (Red wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If battery voltage does not exist, go to next step. If battery voltage exists, go to step  6.
  5. Check the following:
    • Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F59 and M71. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F44 and F101.
    • Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M4.
    • Check fuse block fuse No. 1 (10-amp).
    • Check for open or short between suspect fuel injector and fuse.
    If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. See Figure. Check continuity of specified wire between fuel injector harness connector terminal No. 2 and ECM. See FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 3.5L)  table. See Figure. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If no problem is found, go to step  8.
    FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 3.5L)

    Injector No. ECM Terminal No. Wire Color
    1 1 Red/Black
    2 2 Red/White
    3 3 Red/Yellow
    4 11 Red/Blue
    5 12 Blue/White
    6 13 Purple/Red
  7. Check the following:
    • Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F44 and F101. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check for open or short between suspect fuel injector and ECM.
  8. Check fuel injector. See FUEL INJECTOR . If problem is found, replace as necessary. If no problem is indicated at this time, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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