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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 601 (3.0L Diesel - DTCS P05EF-00 To P2002-00 - 1500) >> Diagnosis And Testing >> P05F8-00-REDUCTANT Heater Control Module Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    NOTE:

    If DTCs P20B9, P20BB, or P20BC are present, perform the Diagnostics for those DTCs before continuing with this one.

    1. Ignition on, engine not running.
    2. With the scan tool, erase DTCs in the PCM.
    3. Start the engine and allow the engine to reach normal operating temperature.
    4. Monitor the scan tool for at least two minutes.
    5. With the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  2

      No 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK THE (F343) ASD SUPPLY CIRCUIT, (A914) FUSED B+ CIRCUIT AND THE (Z909) HCU GROUND CIRCUIT FOR A SHORT TO GROUND OR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition on, engine off.
    2. Measure the voltage across the (F343) ASD Supply circuit and the (Z909) HCU Ground circuit at the DEF HCU harness connector. Then, measure the voltage across the (A914) Fused B+ circuit and the (Z909) HCU Ground circuit at the DEF HCU harness connector.

      Was the difference of either voltage reading greater than 1.0 Volts of battery voltage?

      Yes 

      • Repair the (F343) ASD Supply circuit or the (A914) Fused B+ circuit for an open or short to ground, or check the (Z909) Ground circuit for an open.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR DAMAGED WIRES OR DAMAGED TERMINALS 
    1. Turn the ignition off.
    2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the DEF HCU and the PCM.
    3. Look for any chafed, pierced, pinched, or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals.

      Were any problems found?

      Yes 

      No 

      • Go To  4
  4. DEF HCU 
    1. Replace the DEF Heater Control Unit (HCU) in accordance with the service information.
    2. Turn the ignition on.
    3. With the scan tool, erase PCM DTCs.
    4. Start the engine and run it until it reaches operating temperature.
    5. Test drive the vehicle under normal operating conditions.
      NOTE:

      During cold ambient temperatures, it may be necessary to test drive the vehicle for an extended period to properly cycle the fail conditions for this DTC.

    6. With the scan tool, read PCM DTCs.

      Does the scan tool display this DTC?

      Yes 

      • Replace the Powertrain Control Module in accordance with the service information. Refer to REMOVAL .
      • Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .

      No 

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