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Home >> Chrysler >> 2012 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (6.4L - DTCS P0522 To P1521) >> Diagnosis And Testing >> P150D-Cold Start Rough Idle - Open Throttle Start >> Diagnostic Test

Diagnostic Test

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  1. DTC IS ACTIVE 
    NOTE:

    Review the vehicle repair history for any misfire condition repairs that have been performed.

    NOTE:

    Diagnose and repair any other active component or circuit DTCs before continuing with this procedure.

    NOTE:

    Allow the engine to cool to ambient temperature before proceeding.

    NOTE:

    Diagnose and repair any misfire DTCs before continuing with this procedure.

    1. Turn the ignition on.
    2. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information.
    3. Start the engine and allow it to reach operating temperature.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

      NOTE:

      Attempt to operate the vehicle under conditions similar to which the DTC was set.

    4. With the scan tool, select View DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2.

      No 

      • Refer to STANDARD PROCEDURE and perform the INTERMITTENT CONDITION diagnostic procedure.
  2. VISUAL INSPECTION 
    NOTE:

    Anything that affects the speed of the crankshaft can cause this DTC to set.

    Inspect the engine for any of the following conditions:

    • Worn serpentine belt
    • Misalignment or binding water pump, P/S pump or A/C compressor pulleys
    • Improper CKP, CMP, MAP or TP Sensor mounting.
    • Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc.
    • Corroded PCM power or ground circuits.
    • Vacuum leaks.
    • Restriction in the air induction or exhaust system.
    • Internal engine component malfunction.
    NOTE:

    Rough Idle may occur and may not be caused by component failure. Any of the following conditions can be the cause:

    • Moisture on ignition system components
    • Insufficient fuel
    • Low quality fuel
    • Manual transmission bog
    • Towing overload

    Were any problems found?

    Yes 

    • Repair as necessary.
    • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

    No 

    • Go To  3.
  3. ECT SENSOR OPERATION 
    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 soak)

    1. Ignition on, engine not running.
    2. With a scan tool, read the Engine Coolant Temperature (ECT) Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature.
      NOTE:

      If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.

    3. Start the Engine.
    4. During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temperature 82°C (180°F). The value should reach at least 82°C (180°F).

      Did the ECT value increase smoothly and did it reach at least 182°C (180°F)?

      Yes 

      • Go To  4.

      No 

      • Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. Replace the ECT Sensor if no problems were found with the connectors.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  4. MAP SENSOR OPERATION 
    1. Ignition on, engine not running.
    2. With a scan tool, read the Barometric Pressure.
      NOTE:

      The Barometric Pressure should be approximately equal to the actual barometric pressure.

    3. Turn the ignition off.
    4. Connect a Vacuum Gauge to a Manifold Vacuum source.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    5. Start the engine.
    6. Allow the engine to idle.
      NOTE:

      If engine will not idle, maintain a constant RPM above idle.

    7. Using the scan tool, read the MAP Sensor vacuum value.
      NOTE:

      If necessary, compare the Barometric Pressure value of this vehicle to the value of a known good vehicle of a similar make and model.

      Is the scan tool reading for MAP Vacuum within 1 inch of Hg on the Vacuum Gauge and is the Barometric Pressure reading of the vehicle the approximately the same as actual Barometric Pressure?

      Yes 

      • Go To  5.

      No 

      • Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found with the connectors.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  5. CHECKING THE FUEL DELIVERY SYSTEM 
    1. Refer to DIAGNOSIS AND TESTING and perform the diagnostic procedure for Checking the Fuel Delivery System.

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

      No 

      • Go To  6.
  6. CHECKING THE OXYGEN SENSOR OPERATION 
    1. Refer to DIAGNOSIS AND TESTING and perform the diagnostic procedure for Checking the Oxygen Sensor Operation.

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

      No 

      • Go To  7.
  7. IGNITION SYSTEM OPERATION 
    WARNING:

    When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    1. Turn the ignition off.
    2. Remove the Ignition wire/coil from the Spark Plug.
    3. Disconnect Fuel Injector harness connector of the cylinder being tested.
    4. Install a spark tester on the Ignition wire.
    5. While cranking the engine observe the spark coming from the spark tester.
      NOTE:

      A crisp blue spark that is able to jump the gap of the spark tester should be generated.

      Is good spark present?

      Yes 

      • Go To  8.

      No 

      • Go To  9.
        NOTE:

        Connect the Fuel Injector harness connector before continuing.

  8. SPARK PLUG 
    1. Turn the ignition off.
    2. Remove the Spark Plug.
    3. Inspect the Spark Plug for the following conditions:
      • Cracks
      • Carbon Tracking
      • Foreign Material
      • Gap size out of specifications
      • Loose or broken electrode
      NOTE:

      Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move.

      Were any of the above conditions present?

      Yes 

      • Replace the Spark Plug.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

      No 

      • Go To  11.
  9. IGNITION WIRE 
    NOTE:

    If the vehicle or the cylinder being tested does not have an ignition wire answer YES to this test and continue.

    1. Turn the ignition off.
    2. Remove the ignition wire.
    3. Measure the resistance of the ignition wire.

      Is the resistance below 10K Ohms?

      Yes 

      • Go To  10.

      No 

      • Replace the Ignition Wire.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  10. IGNITION COIL 
    WARNING:

    When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    1. Disconnect the Ignition Coil harness connector.
    2. Using a 12-volt test light connected to 12 volts, probe the Coil Control circuit.
      NOTE:

      Make sure the test light is probing the circuit before actuating the Coil or a DTC may set and not allow the actuation.

    3. Crank the engine for five seconds while observing the test light.

      Does the test light brightly blink/flicker while the engine was cranking?

      Yes 

      • Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Ignition Coil.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

      No 

      • Repair the excessive resistance or short in the Ignition Coil Control circuit.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  11. ENGINE MECHANICAL 

    Check for any of the following conditions/mechanical problems:

    • ENGINE VACUUM - must be at least 13 inches in neutral
    • ENGINE VALVE TIMING - must be within specifications
    • ENGINE COMPRESSION - must be within specifications
    • ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
    • ENGINE PCV SYSTEM - must flow freely
    • TORQUE CONVERTER STALL SPEED - must be within specifications
    • POWER BRAKE BOOSTER - no internal vacuum leaks
    • FUEL - must be free of contamination
    • CAM LOBES - must not be worn excessively
    • CYLINDER LEAKAGE TEST - must be within specifications
    • VALVE SPRINGS - cannot be weak or broken

    Are there any engine mechanical problems?

    Yes 

    • Repair as necessary.
    • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

    No 

    • Go To  12.
  12. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors and the Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      • Repair as necessary.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.

      No 

      • Replace and program the Powertrain Control Module in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
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