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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 4 CYL & V6 >> Fuel System >> Fuel Control >> Fuel Injector Circuits (Quest)
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Fuel Injector Circuits (Quest)

  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. 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 injector 2-pin harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 2 (Yellow wire). See WIRING DIAGRAMS article. If battery voltage does not exist, go to next step. If battery voltage exists, go to step  6.
  5. Check following:
    • Check for poor, loose, corroded or damaged terminal connections in in-line harness connectors F12 and F201. See WIRING DIAGRAMS article.
    • Check for poor, loose, corroded or damaged terminal connections in in-line harness connectors E53 and F2.
    • Check for open or short between suspect fuel injector and battery.
    If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Check continuity of specified wire between ECM harness connector and injector harness connector terminal No. 1. See FUEL INJECTOR CIRCUIT IDENTIFICATION (QUEST)  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 (QUEST)

    Injector No. ECM Terminal No. Wire Color
    1 102 Green/Orange
    2 109 Green
    3 104 Green/Red
    4 111 Yellow/Purple
    5 106 Yellow/Green
    6 113 Gray/Blue
  7. Check following:
    • Check for poor, loose, corroded or damaged terminal connections in in-line harness connectors F12 and F201. See WIRING DIAGRAMS article.
    • Check for open or short between suspect fuel injector and ECM.
    If problem is found, repair as necessary. After repair, retest system.
  8. Check fuel injector. See FUEL INJECTOR . If problem is found, replace, if necessary. After repair, retest system. If no problem is found, 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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