Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

START AND STALL CONDITION DIAGNOSTIC TEST REFERENCE

TEST	ACTION	APPLICABILITY
1	Ignition on, engine not running. With the DRBIII®, read engine DTCs. Are any DTCs present? Yes --> Refer to the DRIVEABILITY CATEGORY and perform the appropriate diagnostics. Perform POWERTRAIN VERIFICATION TEST VER - 1 . No --> Go To 2	All
2	NOTE: If you are unable to communicate with the SKIM, refer to the COMMUNICATION CATEGORY and perform the appropriate test. With the DRBIII®, read the SKIM codes.Are there any SKIM DTCs?Yes --> Refer to VEHICLE THEFT/SECURITY and perform the appropriate diagnostics.Perform POWERTRAIN VERIFICATION TEST VER - 1 .No --> Go To 3	All
3	With the DRBIII®, read TP Sensor voltage. While monitoring the DRBIII®, slowly open and close the Throttle. Is the voltage change smooth? Yes --> Go To 4 No --> Replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 .	All
4	With the DRBIII®, read TP Sensor voltage. Throttle must be against stop. Is the voltage 0.92 or less with the Throttle closed? Yes --> Go To 5 No --> Check for a binding throttle condition. If OK, replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 .	All
5	NOTE: For this test to be valid, the thermostat must be operating correctly. NOTE: This test works best if performed on a cold engine (cold soaked). NOTE: If the vehicle was allowed to sit over night with no engine start, coolant temperature should be near ambient temperatures. With the DRBIII®, read the ECT value. NOTE: If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached. 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 82°C (180°F). The value should reach at least 82°C (180°F).Did the Engine Temperature value increase smoothly and did it reach at least 82°C (180°F)?Yes --> Go To 6No --> Replace the Engine Coolant Temperature Sensor.Perform POWERTRAIN VERIFICATION TEST VER - 1 .	All
6	The following additional items should be checked as a possible cause for a start and stall condition. Refer to any Technical Service Bulletins (TSBs) that may apply. 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? Yes --> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 1 . No --> Go To 7	All
7	Verify that the Fuel tank is not empty before continuing. Follow the diagnostics for Checking Fuel Delivery under the Driveability section of this manual. Was the No Start condition solved after following the above diagnostic test? Yes --> Test Complete. No --> Check for contamination/water in the fuel. Ensure the fuel being used in this vehicle meets manufactures Fuel Requirement. Perform POWERTRAIN VERIFICATION TEST VER - 1 .	All