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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Controls - System & Component Testing - 4 CYL & V6) >> Engine Sensors & Switches >> Ignition Switch (Start Signal) >> Pathfinder & QX4

Pathfinder & QX4

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Nissan Xterra, 2002 Nissan Sentra, 2002 Nissan Quest, 2002 Nissan Pathfinder, and 2002 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step  3.
  2. Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See CHECKING START SIGNAL (PATHFINDER & QX4)  table. If start signal displays as specified, go to step  8. If start signal does not display as specified, go to step  4.
    CHECKING START SIGNAL (PATHFINDER & QX4)

    Condition Start Signal
    Ignition Switch ON OFF
    Ignition Switch START ON
  3. Backprobing at ECM, measure voltage between ground and ECM terminal No. 42 (Black/Yellow wire) while cranking engine. See Figure. Battery voltage should exist when ignition switch is in START position. Voltage should be zero volts when ignition switch is in any other position except START. If voltage is as specified, go to step  8. If voltage is not as specified, go to next step.
  4. Turn ignition switch to OFF position, then to START position. If starter motor operates, go to next step. If starter motor does not operate, repair starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
  5. Check fuse block fuse No. 26 (7.5-amp). Fuse block is located under left side of instrument panel. If fuse is blown, replace as necessary fuse. If fuse is okay, go to next step.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Disconnect ignition switch 6-pin harness connector. Check continuity of Red/Black wire between ECM harness connector terminal No. 42 and ignition switch harness connector including fuse block fuse No. 26. See Figure and Figure . Also, check circuits 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.
  7. Check following:
    • Check for poor, loose, corroded or damaged terminal connections in in-line harness connectors M32 and F23. See WIRING DIAGRAMS article.
    • Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors M10 and E3.
    • Check for open or short in Red/Black wire between ignition switch and fuse block.
    • Check for open or short in Black/Yellow wire between ECM and fuse block.
    If problem is found, repair as necessary. After repair, retest system.
  8. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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