LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2001 >> Cherokee Classic, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> DRIVEABILITY Problems >> Start & Stall Condition >> Grand Cherokee
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Grand Cherokee

  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 DRB scan tool, read and record Sentry Key Immobilizer Module (SKIM) DTC (fault) messages. If no SKIM DTC messages are present, go to next step. If any SKIM DTC messages are present, a fault exists in anti-theft system. Perform appropriate test. See appropriate ANTI-THEFT SYSTEMS article.
  3. Turn ignition off. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Remove test port cap on fuel rail. Install a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge at test port. Start engine and allow to idle. Fuel pressure should be 44.2-54.2 psi (3.1-3.7 kg/cm2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, check fuel return line for kinks or restrictions. See Figure . Repair fuel return line as necessary. If fuel return line is okay, replace fuel filter/pressure regulator. See FUEL FILTER/FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article. If fuel pressure is as specified, go to step  6 .
  4. If engine runs but fuel pressure is less than specified, check for kinked or damaged fuel supply line between fuel pump module and fuel rail. Repair fuel line as necessary and retest. If fuel line is okay, release fuel pressure. Raise and support vehicle. Disconnect fuel pressure line from fuel filter/pressure regulator. See Figure . Connect Fuel Line Pressure Test Adapter Hose (6539) between disconnected fuel line and fuel filter/pressure regulator. Connect fuel pressure gauge to fuel line adapter hose. Turn ignition on, with engine off. Using scan tool, actuate ASD fuel system test and note fuel pressure. Fuel pressure should be 44.2-54.2 psi (3.23-3.96 kg/cm2 ). If fuel pressure is within specification, stop ASD fuel system activation, release fuel pressure and replace fuel filter/pressure regulator. If fuel pressure is not within specification, stop ASD fuel system activation and go to next step.
  5. Release fuel pressure. Remove fuel pump module and inspect fuel inlet strainer. See FUEL PUMP MODULE under FUEL SYSTEMS in 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.
  6. Turn ignition off. Release fuel pressure. 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) between disconnected fuel line and fuel rail. Remove fuel fill cap. Insert other end of hose into a graduated container suitable for gasoline.
    7. CAUTION: DO NOT operate fuel pump longer than 7 seconds.
  7. Using scan tool, actuate ASD fuel system test for 7 seconds. If fuel volume is .5 pt. (.25L) or more, fuel volume is okay. Stop fuel system activation. Remove all test equipment and reconnect fuel supply line to fuel rail. Go to next step. If fuel volume is less than .5 pt. (.25L), check for a kinked fuel line between fuel pump module and fuel rail. Repair fuel lines as necessary and retest. If fuel line is okay, replace fuel pump module assembly. See FUEL PUMP MODULE under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article.
  8. 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.
  9. 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.
    10. 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).
  10. 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 increase is erratic, check for cooling system problems and repair as necessary. If cooling system is okay, replace ECT sensor.
  11. 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 vacuum must be at least 13 in. Hg with shift selector in Neutral.
    • Throttle body must be free of carbon build-up and dirt.

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

scientia non olet · About LEMON Manuals