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Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECKING FOR CYLINDER MISFIRE CONDITION PRESENT 
    NOTE:

    Check for any Service Bulletins that apply to a Misfire condition. Review the vehicle repair history for any misfire condition repairs that have been performed.

    NOTE:

    Reviewing the vehicle repair history may aid in the repair of this DTC.

    1. Start the engine.
    2. Allow the engine to reach normal 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.

    3. With the scan tool, read DTCs and record on the repair order.

      Is P0300 or any other Misfire DTCs set along with the P050D?

      Yes 

      • Perform the appropriate Cylinder Misfire diagnostic procedure.

      No 

      • Go To  2
  2. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Check for contaminants that may have damaged an O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.

    NOTE:

    Diagnose and repair any other DTCs before continuing with this test.

    1. Start the engine.
    2. Allow the engine to reach normal operating temperature.
    3. With the scan tool, read DTCs and record on the repair order.
      NOTE:

      It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

      Is the DTC active or pending?

      Yes 

      • Go To  3

      No 

  3. 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.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. O2 SENSOR OPERATION 
    1. Start the engine.
    2. Allow the engine to reach normal operating temperature.
      NOTE:

      If one of the O2 Sensor's Signal or Return circuits is shorted to ground the scan tool will display all O2 Sensor voltage readings low. The O2 Sensor that is shorted to ground will display a voltage reading near or at 0 volts.

      NOTE:

      If one of the O2 Sensor Signal or Return circuits are shorted to voltage, the scan tool will display all O2 Sensor voltage readings high.

      NOTE:

      After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors.

    3. With the scan tool, monitor all of the O2 Sensor voltage readings.

      Is the voltage switching between 2.5 and 3.4 volts for all the O2 Sensors?

      Yes 

      • Go To  5

      No 

      • Go To  9
  5. O2 SENSOR HEATER OPERATION 
    1. Turn the ignition off.
      NOTE:

      Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts.

    2. Turn the ignition on.
    3. With the scan tool, actuate the O2 Heater Test.
      NOTE:

      The DTC needs to be cleared before actuating the Heater Test, if the DTC is not cleared, the Heater Test may not be allowed to actuate.

    4. With the scan tool, monitor O2 Sensor voltage for at least 2 minutes.

      Does the voltage stay above 4.5 volts?

      Yes 

      • Verify that there is good pin to terminal contact in the O2 Sensor and the Powertrain Control Module connectors. Replace the O2 Sensor if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. MAP SENSOR OPERATION 
    1. Turn the ignition off.
    2. Connect a Vacuum Gauge to a Manifold Vacuum source.
    3. Start the engine.
    4. Allow the engine to idle.
      NOTE:

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

    5. With the scan tool, read the MAP Sensor vacuum value.

      Is the scan tool reading within 1" of Hg on the Vacuum Gauge reading?

      Yes 

      • Go To  7

      No 

      • Verify that there is good pin to terminal contact in the MAP Sensor and the Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. 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. Turn the ignition on.
    2. With the 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 82° C (180° F)?

      Yes 

      • Go To  8

      No 

      • Verify that there is good pin to terminal contact in the ETC Sensor and the Powertrain Control Module connectors. Replace the Engine Coolant Temperature Sensor if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. ENGINE MECHANICAL PROBLEM 
    1. Turn the ignition off.
    2. Check for any of the following conditions/mechanical problems:
      • AIR INDUCTION SYSTEM - must be free from leaks.
      • 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
      • FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

      Are there any engine mechanical problems?

      Yes 

      No 

      • Go To  9
  9. UPSTREAM O2 SENSORS 
    1. Turn the ignition off.
    2. Disconnect the 1/1 or 2/1 O2 Sensor harness connectors.
    3. Turn the ignition on.
    4. With the scan tool, monitor the 1/1 or 2/1 O2 Sensor voltage.
    5. O2 Sensor voltage should read between 4.1 and 5.0 volts on the scan tool with the connector disconnected.
    6. Connect a jumper wire between the (K41) O2 1/1 Signal circuit and the (K902) O2 Return Upstream circuit in the 1/1 O2 Sensor harness connector or between the (K141) O2 2/1 Signal circuit and the (K904) O2 Return Upstream circuit in the 2/1 O2 Sensor harness connector.
      NOTE:

      The voltage should drop from between 4.1 and 5.0 volts to 2.5 volts with the jumper wire in place.

      Did the O2 Sensor voltage change from between 4.1 and 5.0 volts to 2.5 volts with the jumper wire installed?

      Yes 

      • Verify that there is good pin to terminal contact in the related Sensors and the Powertrain Control Module connectors. Replace the 1/1 or 2/1 Upstream O2 Sensor.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
        NOTE:

        Remove the jumper wire before continuing.

  10. (K41) O2 SENSOR 1/1 OR (K141) O2 SENSOR 2/1 SIGNAL CIRCUIT 
    1. With the scan tool, monitor the 1/1 O2 Sensor or 2/1 O2 Sensor voltage reading with the jumper wire removed.
      NOTE:

      The scan tool will display all O2 Sensor voltage readings approximately 5.0 volts when only one O2 Sensor's Signal circuit is shorted to voltage.

      NOTE:

      The scan tool will display one O2 Sensor voltage close to zero and the others will read lower than normal when one O2 Sensor Signal circuit contains excessive resistance.

      Is the voltage between 4.1 and 5.0 volts?

      Yes 

      • Go To  11

      No 

      • Check the (K41) O2 Sensor 1/1 or (K141) O2 Sensor 2/1 Signal circuit for a short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL . Refer to PCM/ECM REPROGRAMMING - GAS .
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. (K902) or (K904) O2 RETURN UPSTREAM CIRCUIT 
    1. Measure the voltage on the (K902) or (K904) O2 Return Upstream circuit in the O2 Sensor harness connector.

      Is the voltage at 2.5 volts?

      Yes 

      • Go To  12

      No 

  12. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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