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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 972 (6.7L Diesel - DTCS P063D To P205D - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P202C-REDUCTANT Tank Heater Control Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 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 for one minute, engine not running.
    2. With the scan tool check for active DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE DEF TANK HEATER GROUND CIRCUIT FOR A SHORT TO ANOTHER VOLTAGE SUPPLY 
    1. Turn ignition off.
    2. Disconnect the DEF Supply Pump assembly harness connector.
    3. Disconnect the DEF Dosing Control Unit C2 harness connector.
    4. Measure the resistance between the DEF Tank Heater Supply circuit and all other power supply circuits at the DEF Dosing Control Unit C2 harness connector.

      Is the resistance above 10k Ohms between the DEF Tank Heater Supply circuit and all other power supply circuits?

      Yes 

      • Repair the DEF Tank Heater Supply circuit for a short to the circuit that measured below 10k Ohms.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Go To  3
  3. CHECK FOR THE DEF TANK HEATER SUPPLY CIRCUIT SHORTED TO THE DEF TANK HEATER GROUND CIRCUIT 
    1. Measure the resistance between the DEF Tank Heater Supply circuit and the DEF Engine Tank Heater Ground circuit at the DEF Supply Pump assembly harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the short between the DEF Tank Heater Supply circuit and the DEF Engine Tank Heater Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  4. DEF SUPPLY PUMP ASSEMBLY 
    1. Turn ignition off.
    2. Reconnect the DEF Dosing Control Unit C2 harness connector.
    3. Turn ignition on.
    4. With a scan tool, View DTCs.

      Does the scan tool display DTC P202B as active and P202C as stored with the DEF Supply Pump assembly harness connector disconnected?

      Yes 

      • Replace the DEF Supply Pump Assembly in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

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