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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Tests W/Codes - 3.0L) >> No-Start Tests >> Test NS-5A - Inspecting Fuel Pump

Test NS-5A - Inspecting Fuel Pump

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  section.
  1. Using scan tool, stop actuation test. Using scan tool, actuate Auto Shutdown (ASD) relay. Touch fuel pump relay. If fuel pump relay does not pulsate when actuated, go to TEST NS-5B. If fuel pump relay pulsates when actuated, turn ignition off.
  2. Disconnect fuel pump relay. Using scan tool in voltmeter mode, check voltage on fuel pump relay connector Dark Green/White wire. If voltage is less than 10 volts, repair open Dark Green/White wire. If voltage is more than 10 volts, install a known-good relay. Attempt to start engine. If engine starts, replace original relay. Perform TEST VER-2.
  3. If engine does not start, disconnect fuel pump harness connector. Ensure fuel pump connector has clean and tight connections. Turn ignition on. Using scan tool, actuate fuel system. While still actuating, put scan tool in voltmeter mode. Using scan tool, check voltage on fuel pump connector Dark Green/Black wire. If voltage is less than 10 volts, repair open Dark Green/Black wire. Perform TEST VER-1. If voltage is more than 10 volts, stop actuation test.
  4. Using scan tool in ohmmeter mode, check resistance of fuel pump connector Black wire (fuel pump ground). If resistance is less than 5 ohms, replace fuel pump. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Black wire. Perform TEST VER-1.
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