2000 Infiniti QX4FACTORY OEM SERVICE PROCEDURE

Fuel Injector Circuits (Maxima)

  1. Start engine. With engine idling, listen to each fuel injector. If every injector clicks, system is okay. If any injector does not click, go to next step.
  2. Turn ignition off. For injectors on left bank, disconnect inoperative injector harness connector. Turn ignition on. Measure voltage between ground and injector harness connector Red wire. For injectors on right bank, disconnect right bank injector circuit harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and right bank injector circuit harness connector terminal No. 5 (Red wire). See Fig 2. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
  3. Turn ignition off. Disconnect PCM harness connector. Check continuity of specified wire between PCM harness connector and appropriate injector harness connector (on left bank), or right bank injector circuit harness connector (on right bank). See FUEL INJECTOR CIRCUIT IDENTIFICATION (MAXIMA)  table. See Figure and Fig 2 . If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  4. If inoperative injector is on left bank, go to next step. If inoperative injector is on right bank, check continuity of appropriate wire between right bank injector circuit harness connector and PCM harness connector. See FUEL INJECTOR CIRCUIT IDENTIFICATION (MAXIMA)  table. If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  5. Check fuel injector. See FUEL INJECTOR . Replace, if necessary. If injector is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
    Fig 1: Locating Right Bank Injector Circuit Harness (Maxima)
    G00015121Courtesy of NISSAN MOTOR CO., U.S.A.
FUEL INJECTOR CIRCUIT IDENTIFICATION (MAXIMA)

Injector No. PCM Terminal No. (1) Wire Color
1 (2) 101 Red/Black
2 103 Red/White
3 (3) 105 Red/Yellow
4 107 Red/Blue
5 (4) 102 Blue/White
6 104 Purple/Red
(1) See Figure.
(2) Injector sub-harness connector terminal No. 6.
(3) Injector sub-harness connector terminal No. 2.
(4) Injector sub-harness connector terminal No. 1.
Fig 2: Identifying Injector Sub-Harness Connector Terminals (Maxima & Pathfinder)
G96I11500Courtesy of NISSAN MOTOR CO., U.S.A.
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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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