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Tahoe / Yukon Service Manual

DTC P041B-P041E

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5591383 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 P041B Exhaust Gas Recirculation Temperature Sensor Performance DTC P041C Exhaust Gas Recirculation Temperature Sensor Circuit Low DTC P041D Exhaust Gas Recirculation Temperature Sensor Circuit High DTC P041E Exhaust Gas Recirculation Temperature Sensor Circuit Intermittent Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal — Terminal 1 P041C P041D P041D P041B
Signal — Terminal 2 P041C P041D P041D P041B

Typical Scan Tool Data Exhaust Gas Recirculation Temperature Sensor

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Idling Parameter Normal Range: 200 to 400°C (392 to 752°F)
Signal — Terminal 1 −40°C (−40°F) −40°C (−40°F) 1000°C (1,922°F)
Signal — Terminal 2 −40°C (−40°F) −40°C (−40°F) 1000°C (1,832°F)

Circuit/System Description For an overview of the component/system, refer to: Exhaust Gas Recirculation (EGR) System Description

Circuit Description
Signal — Terminal 1 The control module input circuit has an internal resistance connected to 1.0 V.
Signal — Terminal 2 The control module input circuit has an internal resistance connected to 2.4 V.
Component Description
B130 Exhaust Gas Recirculation Temperature Sensor The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature. The input voltage varies depending on the temperature of the sensor.
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 P041B DTC P262B = Not set Engine = Running Engine Off Time = Greater than 8 h Ignition Voltage = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met P041C, P041D, P041E Ignition = On Ignition Voltage = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P041B Exhaust Gas Recirculation Temperature Sensor = The temperature does not change within a predetermined time. — After the engine has been Off for 8 h P041C Exhaust Gas Recirculation Temperature Sensor = Warmer than 999°C (1830°F) — For greater than 5 s P041D Exhaust Gas Recirculation Temperature Sensor = Colder than −39°C (−38°F) — For greater than 5 s P040E Exhaust Gas Recirculation Temperature Sensor = Intermittent — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Diagnostic Aids If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease or lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure may correct the high resistance condition due to terminal fretting corrosion. The following parameters are not within 3°C (5°F) of each other: — After the engine has been Off for 8 h Exhaust Gas Recirculation Temperature Sensor Engine Coolant Temperature Sensor Reference Information Schematic Reference Engine Controls 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 the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor = −39 to 999°C (−38 to 1830°F) and changes ⇒ If not between −39 and 999°C (−38 and 1830°F) or does not change Refer to: Circuit/System Testing ⇓ If between −39 and 999°C (−38 and 1830°F) and changes
  3. Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor = The value should not spike or drop out. Perform the action while monitoring the parameter: Wiggle the harness and connector: B130 Exhaust Gas Recirculation Temperature Sensor Wiggle the harness and connector: X2 @ K20 Engine Control Module ⇒ If the value spikes or drops out Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If the value does not spike or drop out
  4. 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 Refer to: Circuit/System Testing ⇓ If the DTC is not set
  5. All OK. Circuit/System Testing
  6. Ignition/Vehicle & All vehicle systems » Off
  7. Disconnect the electrical connector: B130A Exhaust Gas Recirculation Temperature Sensor 1
  8. Ignition » On / Vehicle » In Service Mode
  9. Test for 0.5 to 1.5 V between the test points: Signal circuit terminal 1 & Ground ⇒ If greater than 1.5 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K20 Engine Control Module 4.3. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If less than 0.5 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K20 Engine Control Module 4.3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 4.4. Test for less than 2 Ω between the test points: Signal 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 » Replace the component: K20 Engine Control Module ⇓ If between 0.5 and 1.5 V
  10. Ignition » On / Vehicle » In Service Mode
  11. Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor = Colder than −39°C (−38°F) ⇒ If −39°C (−38°F) or warmer 6.1. Ignition/Vehicle » Off 6.2. Disconnect the electrical connector: K20 Engine Control Module 6.3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: K20 Engine Control Module ⇓ If colder than −39°C (−38°F)
  12. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground
  13. Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor = Warmer than 999°C (1,830°F) ⇒ If 999°C (1,830°F) or colder 8.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 8.2. Disconnect the electrical connector: K20 Engine Control Module 8.3. Ignition » On / Vehicle » In Service Mode 8.4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 8.5. Ignition/Vehicle » Off 8.6. 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 » Replace the component: K20 Engine Control Module ⇓ If warmer than 999°C (1,830°F)
  14. Test or replace the component: B130A Exhaust Gas Recirculation Temperature Sensor 1 Component Testing
  15. Ignition/Vehicle » Off
  16. Disconnect the appropriate electrical connector: B130A Exhaust Gas Recirculation Temperature Sensor 1
  17. Test the resistance between the test points: Terminal 1 & Terminal 2 @ Component
  18. Verify the value is within the range listed in the table: Temperature Versus Resistance ⇒ If not in the specified range Replace the component: B130A Exhaust Gas Recirculation Temperature Sensor 1 ⇓ If in the specified range
  19. 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: B130A Exhaust Gas Recirculation Temperature Sensor 1 ⇓ If infinite resistance
  20. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Exhaust Gas Recirculation Cooler Temperature Sensor Replacement - Position 1 — B130A  Exhaust Gas Recirculation Temperature Sensor 1 For control module replacement, programming, and setup refer to: Control Module References