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Test NS-2A - Inspecting Fuel System

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS  . If vehicle is equipped with factory theft alarm, use DRB-II to read theft alarm status. If DRB-II displays FUEL ON, go to step 1). If not, check theft alarm system. See THEFT ALARM SYSTEM  at beginning of this article.
  1. Ensure throttle is at idle position. Using DRB-II, read TPS sensor voltage. If voltage is more than 1.5 volts, replace throttle position sensor. Perform VERIFICATION TEST VER-1  . If voltage is 1.5 volts or less, disconnect fuel injector No. 1 connector.
  2. Place DRB-II in voltmeter mode and actuate ASD fuel system. Probe Dark Green/Orange wire (Dark Green/Black wire on Wrangler). If voltage is 10 volts or less on both wires, repair Dark Green/Orange between injector connector and harness splice. Perform VERIFICATION TEST VER-1  . If voltage is more than 10 volts on both wires, turn ignition off.
    WARNING: Fuel system must be opened and may be under high pressure.
  3. Install fuel pressure gauge in fuel supply line, on fuel rail near fuel pressure regulator. Ensure fuel tank is at least 1/4 full. Reconnect injector connector. Turn ignition on. Using DRB-II, actuate ASD fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-7A.
  4. If fuel pump operation can be heard, read fuel pressure gauge. If fuel pressure is more than 43 psi, perform TEST NS-4B. If fuel pressure is less than 35 psi, perform TEST NS-4A  . If fuel pressure is not less than 35 or more than 43 and vehicle starts/stalls repeatedly, perform TEST NS-12A. If vehicle does not start and stall repeatedly, perform TEST NS-3A.
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