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Start & Stall Condition: Testing

  1. Turn ignition on. Using scan tool, check for Diagnostic Trouble Codes (DTC). If no DTCs are present, go to next step. If any DTCs are present, perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article.
  2. Using scan tool, check for Sentry Key Immobilizer Module (SKIM) DTCs. If no SKIM DTCs are present, go to next step. If any SKIM DTCs are present, see DIAGNOSTIC TROUBLE CODE IDENTIFICATION table under SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.
  3. Turn ignition off. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Remove fuel rail test port cap. Install a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge at test port. Turn ignition on. Using scan tool, actuate fuel pump relay. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is as specified, go to step  7 . If fuel pressure is more than specified, replace fuel filter/pressure regulator. See FUEL FILTER/FUEL PRESSURE REGULATOR under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article.
    4. NOTE: DO NOT operate fuel pump for longer than 7 seconds.
  4. Turn ignition off. Release fuel pressure if necessary. Disconnect fuel supply line from fuel rail. Install Fuel Line Pressure Test Adapter Hose (6539 for 5/16" fuel lines or 6631 for 3/8" fuel lines) to disconnected fuel line. Insert other end of fuel line pressure test adapter into a graduated container. Turn ignition on. Using scan tool, actuate fuel pump relay. This should activate fuel pump and pressurize system. Fuel pump should deliver at least .5 pt. (.25 L) of fuel in 7 seconds. If fuel pump volume is within specification, go to next step. If fuel pump volume is not within specification, repair kinked or damaged fuel supply line between fuel pump module and fuel rail.
  5. Turn ignition off. Raise and support vehicle. Disconnect fuel supply line at fuel pump module. Connect fuel line pressure test adapter and test port "T" between disconnected fuel supply line and fuel pump module. Install a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge at "T". Turn ignition on. Using scan tool, actuate fuel pump relay. Monitor fuel pressure at fuel pressure gauge. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is as specified, repair kinked or damaged fuel supply line between fuel pump module and fuel rail that is cause of low fuel pressure.
  6. With vehicle raised and supported, remove fuel pump module and inspect fuel inlet strainer. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article. If fuel inlet strainer is plugged, replace fuel pump inlet strainer. If fuel inlet strainer is not plugged, replace fuel pump module. Test is complete.
  7. Turn ignition on. Using scan tool, monitor TP sensor voltage while slowly depressing throttle pedal from idle position to wide open throttle position. If voltage changes smoothly, go to next step. If voltage does not change smoothly, replace TP sensor.
  8. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TP sensor voltage. If voltage is 0.92 volt or less, go to next step. If voltage is more than 0.92 volt, check for binding throttle linkage. Repair linkage as necessary. If linkage is not binding, replace TP sensor.
    9. NOTE: The following procedure assumes that the cooling system thermostat is functioning properly. Test works best if performed on a totally cold engine (cold soak).
  9. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82°C), allow engine coolant temperature to cool down to 150°F (66°C) before proceeding. If engine coolant temperature is 150°F (66°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value does not increase smoothly, replace ECT sensor.
  10. Check the following additional items as possible causes for start and stall condition:
    • Check for any technical service bulletins that may apply.
    • Fuel must be free of contamination.
    • Engine exhaust system must be free of restrictions.
    • Engine compression must be within specification.
    • Engine valve timing must be within specification.
    • Engine must be free of vacuum leaks.
    • Throttle body must be free of carbon build-up and dirt.

    Repair any problems as necessary. If no problems exist, test is complete.

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