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Home >> Chrysler >> 2009 >> 300 LX >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0645 To P1572 >> P1404-EGR Close Position Performance >> Diagnostic Test
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Diagnostic Test

  1. DTC IS ACTIVE 
    NOTE: Diagnose and repair any EGR signal circuit high or low DTCs before continuing with this procedure.
    1. Turn the ignition on.
    2. With the scan tool, select View DTCs. Record DTC the 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 can result in possible serious or fatal injury.
      WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled.
      NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set.
      NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set.
    4. With a scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. (F856) 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE 
    Fig 1: Performing Voltage Drop Test To 5-Volt Supply Circuit
    GC0097608Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
    2. Using a voltmeter, perform a voltage drop test by backprobing the (F856) 5-volt Supply circuit at the Exhaust Gas Recirculation Valve harness connector and probing the appropriate terminal of the PCM Pinout Box 8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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 can result in possible serious or fatal injury.
    3. Start the engine.

      Is the voltage below 0.5 of a volt?

      Yes 

      • Go to step  3

      No 

  3. (K34) EGR SIGNAL CIRCUIT HIGH RESISTANCE 
    Fig 2: Performing Voltage Drop Test To EGR Signal Circuit
    GC0097609Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
    2. Using a voltmeter, perform a voltage drop test by backprobing the (K34) EGR Signal circuit at the Exhaust Gas Recirculation Valve harness connector and probing the appropriate terminal of the PCM Pinout Box 8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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 can result in possible serious or fatal injury.
    3. Start the engine.

      Is the voltage below 0.5 of a volt?

      Yes 

      • Go to step  4

      No 

  4. (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE 
    Fig 3: Performing Voltage Drop Test To Sensor Ground Circuit
    GC0097610Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
    2. Using a voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the Exhaust Gas Recirculation Valve harness connector and probing the appropriate terminal of the PCM Pinout Box 8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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 can result in possible serious or fatal injury.
    3. Start the engine.

      Is the voltage below 0.5 of a volt?

      Yes 

      • Go to step  5

      No 

  5. (Z904) GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Using 12-Volt Test Light Connected To 12 Volts To Check Ground Circuit In Exhaust Gas Recirculation Valve Harness Connector
    GC0097495Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Exhaust Gas Recirculation Valve harness connector.
    3. Using a 12-volt test light connected to the 12 volts, check the (Z904) Ground circuit in the Exhaust Gas Recirculation Valve harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

      Is the test light illuminated and bright?

      Yes 

      • Go to step  6

      No 

  6. (K35) EGR CONTROL CIRCUIT HIGH RESISTANCE 
    Fig 5: Performing Voltage Drop Test To EGR Control Circuit
    GC0097611Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect the Exhaust Gas Recirculation Valve connector.
      CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
    3. Using a voltmeter, perform a voltage drop test by backprobing the (K35) EGR Control circuit at the Exhaust Gas Recirculation Valve harness connector and probing the appropriate terminal of the PCM Pinout Box 8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
    4. 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 can result in possible serious or fatal injury.
    5. With the scan tool, perform the EGR System Test.
    6. Select OPEN to open the EGR valve.
    7. Monitor the circuit voltage on the voltmeter.

      Is the voltage below 0.5 of a volt when the valve was opened during the system test?

      Yes 

      • Go to step  7

      No 

  7. (K34) EGR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 6: Measuring Resistance Between Ground And EGR Signal Circuit In Exhaust Gas Recirculation Valve Harness Connector
    GC0090930Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Exhaust Gas Recirculation Valve harness connector.
    3. Disconnect the Powertrain Control Module (PCM) C2 harness connector.
    4. Measure the resistance between ground and the (K34) EGR Signal circuit in the Exhaust Gas Recirculation Valve harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  8

      No 

  8. EXHAUST GAS RECIRCULATION VALVE 
    1. Connect the Powertrain Control Module (PCM) connector.
    2. Turn the ignition on.
    3. With the scan tool, actuate the EGR Valve Solenoid Duty Cycle.
    4. Using a 12-volt test light connected to ground, check the (K35) EGR Control circuit in the Exhaust Gas Recirculation Valve harness connector.
      NOTE: If the DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear the DTCs before starting the actuation.
      NOTE: The voltage supplied to the solenoid circuit during the actuation may be less than battery voltage. The test light should be illuminated, but may not be as bright as a direct connection to the battery.

      Is the test light illuminated during the actuation?

      Yes 

      No 

      • Go to step  9
  9. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Exhaust Gas Recirculation Valve 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.
    4. Refer to any Technical Service Bulletins (TSBs) that may apply.

      Were any problems found?

      Yes 

      No 

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