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Fuel Injector Circuits (Altima, Frontier, Sentra & Xterra)

  1. Start engine. 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. Disconnect inoperative injector harness connector. Turn ignition on. Measure voltage between ground and injector harness connector Black/Red wire. 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. See appropriate FUEL INJECTOR CIRCUIT IDENTIFICATION table. Figure, Figure and Figure . If continuity exists, go to next step. If continuity does not exist, repair open in appropriate wire.
  4. 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.
FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA)

Injector No. PCM Terminal No. (1) Wire Color
1 102 Red/Black
2 107 Yellow/Black
3 104 Green/Black
4 109 Blue/Black
(1) See Figure.
FUEL INJECTOR CIRCUIT IDENTIFICATION (FRONTIER & XTERRA 4-CYLINDER MODELS)

Injector No. PCM Terminal No. (1) Wire Color
1 102 White/Black
2 109 White/Blue
3 104 White/Red
4 111 White/Purple
(1) See Figure.
FUEL INJECTOR CIRCUIT IDENTIFICATION (FRONTIER & XTERRA V6 MODELS)

Injector No. PCM Terminal No. (1) Wire Color
1 102 White/Black
2 109 White/Blue
3 104 White/Red
4 111 White/Purple
5 106 White/Green
6 113 White
(1) See Figure.
FUEL INJECTOR CIRCUIT IDENTIFICATION (SENTRA)

Injector No. PCM Terminal No. (1) Wire Color
1 101 Red/Black
2 103 Yellow/Black
3 105 Green/Black
4 107 Blue/Black
(1) See Figure.