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Tahoe / Yukon Service Manual

DTC P1428 or P142A

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5507250 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 P1428 Exhaust Gas Recirculation Temperature Sensor and Intake Air Temperature 2 Sensor Correlation DTC P142A EGR Temperature Sensor 2 - Intake Air Temperature 2 Not Plausible Circuit/System Description For an overview of the component/system, refer to: Exhaust Gas Recirculation (EGR) System Description

Circuit Description
Signal The control module input circuit has an internal resistance connected to 5 V.
Low Reference Grounded through the control module.
Component Description
B130 Exhaust Gas Recirculation Temperature Sensor The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature.
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 P00E9, P010B, P0111, P0114, P0116, P0117, P0118, P0119, P0128, P017B, P017C, P017D, P111E, P117B, P117C, P117D, P117E, P117F, P262B = Not set Ignition Off Time = Greater than 8 h Ignition = On Ignition and Start Switch Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Exhaust Gas Temperature Sensor & Intake Air Temperature Sensor 2 = Not within 20°C (36°F) of each other @ Cold Start-Up 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 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 Special Tools EL-25070 Heat Gun 260 to 400°C (500 to 750°F) Equivalent regional tools: Special Tools Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC P0096, P0097, P0098, P0099, P09E, P010B, P0111, P0114, P0116, P0117, P0118, P0119, P0128, P017B, P017C, P017D, P111E, P117B, P117C, P117CD, P117E, P117F, P262B is not set. ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  3. Verify the scan tool parameter: Exhaust Gas Temperature Sensor = −39 to 999°C (−38 to 1,830°F) ⇒ If not the specified value Refer to: Circuit/System Testing ⇓ If the specified value
  4. Ignition Off Time Greater than 8 h
  5. Verify the scan tool parameter: Exhaust Gas Temperature Sensor & Intake Air Temperature Sensor 2 = Within 20°C (36°F) of each other ⇒ If not the specified value Refer to: Circuit/System Testing ⇓ If the specified value
  6. 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
  7. All OK. Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: B130A Exhaust Gas Recirculation Temperature Sensor 1
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 2 & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the electrical connector: K20 Engine Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference 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 less than 10 Ω
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Exhaust Gas Temperature Sensor = Colder than −39°C (−38°F) ⇒ If −39°C (−38°F) or warmer 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K20 Engine Control Module 5.3. 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 » Replace the component: K20 Engine Control Module ⇓ If colder than −39°C (−38°F)
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2
  7. Verify the scan tool parameter: Exhaust Gas Temperature Sensor = Warmer than 999°C (1,830°F) ⇒ If 999°C (1,830°F) or colder 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Disconnect the electrical connector: K20 Engine Control Module 7.3. Ignition » On / Vehicle » In Service Mode 7.4. 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 7.5. Ignition/Vehicle » Off 7.6. 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 warmer than 999°C (1,830°F)
  8. Test or replace the component: B130A Exhaust Gas Recirculation Temperature Sensor 1 Component Testing
  9. Ignition/Vehicle » Off
  10. Disconnect the electrical connector: B130A Exhaust Gas Recirculation Temperature Sensor 1
  1. Test the resistance between the test points: Signal terminal 1 & Low Reference terminal 2
  2. 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
  3. 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
  4. 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 Exhaust Gas Recirculation Cooler Temperature Sensor Replacement - Position 2 — B130C  Exhaust Gas Recirculation Temperature Sensor 3 For control module replacement, programming, and setup refer to: Control Module References