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Tahoe / Yukon Service Manual

DTC P007C-P007E or P10D6-P10D8

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5845936 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 P007C Charge Air Cooler Temperature Sensor Circuit Low DTC P007D Charge Air Cooler Temperature Sensor Circuit High DTC P007E Charge Air Cooler Temperature Sensor Circuit Erratic DTC P10D6 Charge Air Cooler Temperature Sensor 2 Circuit Low DTC P10D7 Charge Air Cooler Temperature Sensor 2 Circuit High DTC P10D8 Charge Air Cooler Temperature Sensor 2 Circuit Erratic Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal — Terminal 1 @ B193A Charge Air Cooler Air Temperature Sensor - Inlet P007C P007D P007D* P007B, P007E, P026A
Signal — Terminal 2 @ B193A Charge Air Cooler Air Temperature Sensor - Inlet — P007D, P007E — P007B, P007E, P026A
Signal — Terminal 1 @ B193B Charge Air Cooler Air Temperature Sensor - Outlet P10D6 P10D7 P10D7* P026A, P10D5, P10D8
Signal — Terminal 2 @ B193B Charge Air Cooler Air Temperature Sensor - Outlet — P10D7 — P026A, P10D5, P10D8
* Component damage may occur if the circuit is shorted to B+.

Typical Scan Tool Data Charge Air Cooler Temperature Sensor & Charge Air Cooler Temperature Sensor 2

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Idling — At normal operating temperature. Parameter Normal Range: Charge Air Cooler Temperature Sensor = 43 to 54°C (110 to 130°F) Charge Air Cooler Temperature Sensor 2 = 16 to 38°C (60 to 100°F)
Signal — Terminal 1 215°C (419°F) −40°C (−40°F) −40°C (−40°F)
Signal — Terminal 2 215°C (419°F) −40°C (−40°F) −40°C (−40°F)

Circuit/System Description

Circuit Description
Signal — Terminal 1 The control module input circuit has an internal resistance connected to 0.5 V.
Signal — Terminal 2 The control module input circuit has an internal resistance connected to 2.5 V.
Component Description
B193A Charge Air Cooler Air Temperature Sensor - Inlet B193B Charge Air Cooler Air Temperature Sensor - Outlet 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 { P007E } DTC P007C, P007D = Not set { P10D8 } DTC P10D6, P10D7 = Not set Engine = Not cranking Ignition and Start Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P007C, P10D6 Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Warmer than 300°C (572°F) — For greater than 5 s P007D, P10D7 Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Colder than −40°C (−40°F) — For greater than 5 s P007E, P10D8 Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Signal noisy or erratic — For greater than 5 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 Reference Information Schematic Reference 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 the appropriate scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = −39 to 215°C (−38 to 419°F) ⇒ If not between −39 and 215°C (−38 and 419°F) Refer to: Circuit/System Testing ⇓ If between −39 and 215°C (−38 and 419°F)
  3. Verify the scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = The parameter value should not change Perform the action while monitoring the parameter: Wiggle the harness and connector: B193A Charge Air Cooler Air Temperature Sensor - Inlet Wiggle the harness and connector: B193B Charge Air Cooler Air Temperature Sensor - Outlet Wiggle the harness and connector: K20 Engine Control Module ⇒ If the parameter value changes Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If the parameter value does not change
  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 does not set
  5. All OK. Circuit/System Testing
  6. Ignition/Vehicle » Off
  1. Disconnect the appropriate electrical connector: { P007C, P007D, P007E } B193A Charge Air Cooler Air Temperature Sensor - Inlet { P10B6, P10B7, P10B8 } B193B Charge Air Cooler Air Temperature Sensor - Outlet
  2. Ignition » On / Vehicle » In Service Mode
  3. Verify the appropriate scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Colder than −39°C (−38°F) ⇒ If −39°C (−38°F) or warmer 4.1. Ignition/Vehicle » Off 4.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 4.3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground 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)
  4. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground
  5. Verify the scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Warmer than 214°C (417°F) ⇒ If 214°C (417°F) or colder 6.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 6.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 6.3. Ignition » On / Vehicle » In Service Mode 6.4. 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 6.5. Ignition/Vehicle » Off 6.6. 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 214°C (417°F)
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground
  7. Verify the scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Warmer than 214°C (417°F) ⇒ If 214°C (417°F) or colder 8.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 8.2. Disconnect the appropriate 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 214°C (417°F)
  8. Test or replace the component: B193A Charge Air Cooler Air Temperature Sensor - Inlet or B193B Charge Air Cooler Air Temperature Sensor - Outlet Component Testing
  9. Ignition/Vehicle » Off
  10. Disconnect the appropriate electrical connector: B193A Charge Air Cooler Air Temperature Sensor - Inlet B193B Charge Air Cooler Air Temperature Sensor - Outlet
  11. Test for 200 to 114,900 Ω between the test points: Signal terminal 1 & Signal terminal 2 ⇒ If not between 200 and 114,900 Ω Replace the component: B193A Charge Air Cooler Air Temperature Sensor - Inlet or B193B  Charge Air Cooler Air Temperature Sensor - Outlet ⇓ If between 200 and 114,900 Ω
  12. 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: B193A Charge Air Cooler Air Temperature Sensor - Inlet or B193B  Charge Air Cooler Air Temperature Sensor - Outlet ⇓ If in the specified range
  13. 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: B193A Charge Air Cooler Air Temperature Sensor - Inlet or B193B  Charge Air Cooler Air Temperature Sensor - Outlet ⇓ If infinite resistance
  14. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Charge Air Cooler Air Temperature Sensor Replacement — B193A Charge Air Cooler Air Temperature Sensor - Inlet Charge Air Temperature Secondary Sensor Replacement — B193B Charge Air Cooler Air Temperature Sensor - Outlet For control module replacement, programming, and setup refer to: Control Module References