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Home >> Nissan-Datsun >> 1995 >> Quest XE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 3.0L >> Fuel System >> Fuel Injector System Test
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Fuel Injector System Test

NOTE: A fault in fuel injector circuit may set DTC 51. To test system, see DTC 51 diagnostic procedures in the TESTS W/CODES article.
  1. Turn ignition off. Disconnect injector harness connectors (left and right banks). Disconnect ECM harness connector. Turn ignition on. Measure voltage between ground and each injector harness connector Yellow wire.
  2. Also measure voltage between ground and ECM harness connector terminal No. 109 (Red/Black wire). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 25-amp fusible link located in fusible link box next to battery. If fusible link is okay, repair or replace harness or connectors.
  3. Turn ignition off. Check continuity between ECM harness connector terminals No. 101 (Green/Orange wire), No. 103 (Green/Red wire), No. 105 (Yellow/Green wire), No. 110 (Green wire), No. 112 (Yellow/Purple wire) and No. 114 (Gray/Blue wire) and corresponding fuel injector harness connector wire color. Continuity should exist.
  4. If continuity does not exist, repair or replace harness or connectors. If continuity exists, check fuel injector. See FUEL INJECTOR  . If fuel injector is okay, check ECM terminals, harness, and connector terminals for damage or corrosion. Repair or replace as necessary.
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