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Tahoe / Yukon Service Manual

DTC P00DF

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5501035 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P00DF Charge Air Cooler Coolant Inlet Temperature Sensor Performance Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal P00E0 P00E1 P00E1* P00DF, P00E2
Low Reference — P00E1 * P00DF, P00E2
* Component damage may occur if the circuit is shorted to B+.

Typical Scan Tool Data Start-Up Charge Air Cooler Coolant Inlet Temperature Sensor

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Off — For greater than 8 h Parameter Normal Range: Within 3°C (5°F) of ambient air temperature @ Cold Start-Up
Signal 150°C (302°F) −40°C (−40°F) −40°C (−40°F)
Low Reference — −40°C (−40°F) −40°C (−40°F)

Circuit/System Description For an overview of the component/system, refer to: Compressor Air Intake Turbocharger System Description

Circuit Description
Signal The control module input circuit has an internal resistance connected to 5 V.
Circuit Description
Low Reference Grounded through the control module.
Component Description
B34K Charge Air Cooler Coolant Temperature Sensor - Inlet The sensor is a negative temperature coefficient thermistor. As the temperature of the air, fluid, or metal increases, the resistance of the sensor decreases, varying the voltage on the signal circuit.
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Conditions for Running the DTC DTC P007B–P007E, P00E0–P00E2, P10D5–P10D8, P2610 = Not set Ignition and Start Switch Signal = Off — For greater than 8 h Ignition and Start Switch Signal = On or Engine = Idling — For less than 2 s Ignition and Start Signal = Greater than 11 V The following parameters are within 45°C (81°F) of each other: – Charge Air Cooler Coolant Inlet Temperature Sensor – Charge Air Cooler Temperature Sensor – Charge Air Cooler Temperature Sensor 2 Frequency the DTC runs = Once — After the running conditions are met Conditions for Setting the DTC The following parameters are not within 20°C (36°F) of each other: – Charge Air Cooler Coolant Inlet Temperature Sensor – Charge Air Cooler Temperature Sensor – Charge Air Cooler Temperature Sensor 2 Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Particulate Filter Regeneration = Not Allowed Warning Message = Reduced Engine Power Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Engine Heating/Cooling Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify there are no DTCs set, except DTC P00DF, related to the following system/component: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet — Circuit DTCs B193A Charge Air Cooler Air Temperature Sensor - Inlet B193B Charge Air Cooler Air Temperature Sensor - Outlet ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  3. Verify the scan tool Freeze Frame/Failure Records parameters listed below are within 20°C (36°F) of the following parameter: Start-Up Charge Air Cooler Coolant Inlet Temperature Sensor Start-Up Charge Air Cooler Temperature Start-Up Charge Air Cooler Temperature Sensor 2 ⇒ If not within 20°C (36°F) of each other 3.1. Ignition/Vehicle » Off 3.2. Disconnect the electrical connector: B34K Charge Air Cooler Coolant Temperature Sensor
  • Inlet 3.3. Disconnect the appropriate electrical connector: K20 Engine Control Module 3.4. Test for less than 2 Ω between the test points: Low Reference circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω 3.5. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω 3.6. Test or replace the component: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet ⇓ If within 20°C (36°F) of each other
  1. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Repeat the procedure starting at step 1 ⇓ If the DTC is not set
  2. All OK. Component Testing
  3. Ignition/Vehicle » Off
  4. Disconnect the electrical connector: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet
  5. Test for 42 to 78,834 Ω between the test points: Low Reference terminal 1 & Signal terminal 2 ⇒ If not between 42 and 78,834 Ω Replace the component: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet ⇓ If between 42 and 78,834 Ω
  6. Verify the value is within the range listed in the table: Temperature Versus Resistance - Charge Air Cooler Temperature Sensor ⇒ If not in the specified range Replace the component: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet ⇓ If in the specified range
  7. Test for infinite resistance between the test points: Each terminal of the component & The component’s housing ⇒ If less than infinite resistance Replace the component: B34K Charge Air Cooler Coolant Temperature Sensor - Inlet ⇓ If infinite resistance
  8. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Engine Coolant Temperature Sensor Replacement - Charge Air Cooler Coolant Hose — B34K  Charge Air Cooler Coolant Temperature Sensor - Inlet