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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 435 (6.7L Diesel - DTCS P1209 To P2281 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P20B9-REDUCTANT Heater "A" Control Circuit/Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, actuate the line heater.
    3. With the scan tool, view DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to STANDARD PROCEDURE .
  2. CHECK THE DEF PRESSURE LINE HEATER SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the DEF Pressure Line Heater harness connector.
    3. Disconnect the DEF Dosing Control Unit C2 harness connector.
    4. Measure the resistance of the DEF Pressure Line Heater Supply circuit between the DEF Pressure Line Heater harness connector and the DEF Dosing Control Unit C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the DEF Pressure Line Heater Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  3. CHECK THE DEF PRESSURE LINE HEATER RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the DEF Pressure Line Heater Return circuit between the DEF Pressure Line Heater harness connector and the DEF Dosing Control Unit C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the DEF Pressure Line Heater Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  4. CHECK THE DEF PRESSURE LINE HEATER 
    1. Measure the resistance across the terminals of the DEF Pressure Line Heater.

      Does the resistance measure between 4.0 Ohms and 10.0 Ohms?

      Yes 

      • Replace the DEF Dosing Control Unit in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Replace the DEF Pressure Line in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
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