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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 1926 (6.7L Diesel - DTCS P0008-00 To P02E3-00 - 2500HD & 3500HD) >> DTC Troubleshooting >> P026A-00-Charge Air Cooler Efficiency Below Threshold >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR OTHER DTCS 
    1. Turn the ignition on.
    2. With the scan tool, record all Freeze frame data.
    3. With the scan tool, read DTCs.

      Are there any TMAP or Cooling Fan DTCs present?

      Yes 

      • Repair other DTCs before proceeding.

      No 

      • Go To  2
  2. TEMPERATURE/MANIFOLD ABSOLUTE PRESSURE (TMAP) SENSOR 
    1. Turn the ignition off.
    2. Disconnect the TMAP Sensor harness connector.
    3. Remove the TMAP Sensor and reconnect the wiring to the sensor.
    4. Turn the ignition on.
    5. With the scan tool in, monitor the TMAP Sensor while heating the sensor with an external heat source (DO NOT USE OPEN FLAME).

      Does the reading from the sensor increase at least 2.8°C (5°F) on the scan tool?

      Yes 

      • Go To  3

      No 

      • Replace the Temperature/Manifold Absolute Pressure (TMAP) Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. VISUALLY INSPECT THE CHARGE AIR COOLER 
    1. Visually inspect the Charge Air Cooler and Radiator fins for excessive debris restricting air flow through the Charge Air Cooler.

      Are the Charge Air Cooler or Radiator restricted with debris?

      Yes 

      • Clean the debris from the Charge Air Cooler or Radiator.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE COOLING FAN OPERATION 
    1. Check the Viscous Cooling Fan operation. Refer to FAN, COOLING, VISCOUS, DIAGNOSIS AND TESTING .

      Was the Viscous Fan found to be operating normal?

      Yes 

      • Check for a base engine condition, such as an engine overheat or intake air restriction that could cause the Charge Air Cooler to work inefficiently.
      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .

      No 

      • Clean the debris from the Charge Air Cooler or Radiator.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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