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Home >> Jeep >> 2003 >> Wrangler SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> DRIVEABILITY Problems >> Start & Stall Condition
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Start & Stall Condition

  1. With the ignition on, engine not running, read engine DTCs with the DRBIII®. Are any DTCs present? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article and perform the appropriate diagnostics. Also perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article.
    2. NOTE: If you are unable to communicate with the SKIM, perform appropriate COMMUNICATION TEST in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. With the DRBIII®, read the SKIM codes. Are there any SKIM DTCs? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article and perform the appropriate diagnostics. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article. If no, go to the next step.
  3. With the DRBIII®, read TP Sensor voltage. While monitoring the DRBIII®, slowly open and close the throttle. Is the voltage change smooth? If yes, go to the next step. If no, replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article.
  4. With the DRBIII®, read TP Sensor voltage. Throttle must be against stop. Is the voltage 0.92 volt or less with the Throttle closed? If yes, go to next step. If no, check for a binding throttle condition. If OK, replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article.
    5. NOTE: For this test to be valid, the thermostat must be operating correctly. This test works best if performed on a cold engine (cold soaked). If the vehicle was allowed to sit over night with no engine start, coolant temperature should be near ambient temperatures. If engine coolant temperature is above 180° F (82° C), allow the engine to cool until 150°F (65°C) is reached.
  5. With the DRBIII®, read the ECT value. Start the engine. During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temp 180°F (82°C). The value should reach at least 180°F (82°C). Did the engine temperature value increase smoothly and did it reach at least 180°F (82°C)? If yes, go to the next step. If no, replace the Engine Coolant Temperature Sensor. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article.
  6. The following additional items should be checked as a possible cause for a start and stall condition. Refer to any Technical Service Bulletins (TSB's) that may apply to the symptom. The exhaust system must be free of any restrictions. The engine compression must be within specifications. The engine valve timing must be within specifications. The engine must be free from vacuum leaks. The throttle body must be free of carbon buildup and dirt. Do any of the above conditions exist? If yes, repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article. If no, go to next step.
  7. Verify that the fuel tank is not empty before continuing. Follow the diagnostics for Checking Fuel Delivery. See FUEL DELIVERY  under FUEL SYSTEMS. Was the condition solved after following the above diagnostic test? If yes, the test is complete. If no, check for contamination/water in the fuel. Ensure the fuel being used in this vehicle meets manufacturer's fuel requirement. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - WRANGLER article.
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