P111C
DTC P111C
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P111C
- Charge Air Cooler (CAC) Temperature - Intake Air Temperature (IAT) Sensor 2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The charge air cooler (CAC) temperature sensor and intake air temperature (IAT) sensor 2 are variable resistors. The IAT sensor 2 is located in the CAC inlet duct. The CAC temperature sensor is located in the CAC outlet duct before the throttle body assembly. The engine control module (ECM) supplies 5 V to the signal circuits, and a ground for each sensor's low reference circuit. The ECM monitors the CAC temperature sensor and the IAT sensor 2 circuits in order to calculate the temperature of the fuel air. The ECM monitors the CAC sensor and IAT sensor 2 signal for excessively high or low voltages, or for a voltage that is not in correlation with the other sensor's start up signal.
Conditions for Running the DTC
Condition 1
* DTCs P0016, P007C, P0097, P0098, P0112, P0113, P0335, P0336, P0340, or P0341 are not set.
* Ignition has been OFF for 8 hours or more.
* The engine is running.
OR
Condition 2
* DTCs P0016, P007C, P0097, P0098, P0112, P0113, P0335, P0336, P0340, or P0341 are not set.
* Ignition has been OFF for 8 hours or more.
* The engine is running.
* In the first 60 s of engine run time, the ECM determines the block heater is OFF.
AND
* In the first 10 minutes of engine run time, the vehicle speed as been at least 24 km/h (15 mph) for at least 5 minutes and the ECM determines there is no Sunload.
This DTC runs once per key cycle when the conditions in 1 or 2 are met.
Conditions for Setting the DTC
Condition 1
The ECM determines the absolute temperature difference between the CAC Temperature Sensor signal and the IAT Sensor 2 signal is more than 100°C (180°F) at start up.
OR
Condition 2
* The ECM determines the absolute temperature difference between the CAC Temperature Sensor signal and the IAT Sensor 2 signal is more than 35°C (63°F), but less than or equal to 100°C (180°F) after 10 minutes of engine run time.
* The ECM determines the block heater if OFF.
* The ECM determines there is no sunload.
Action Taken When the DTC Sets
DTC P111C is a Type B DTC.
Conditions for Clearing the DTC
DTC P111C is a Type B DTC.
Diagnostic Aids
* Skewed temperature sensors may cause this DTC to set.
* The CAC Temperature Sensor is located after the outlet from the CAC. The CAC Temperature Sensor is also know as the CAC Outlet Temperature Sensor.
* The IAT Sensor 2 is located before the inlet to the CAC. The IAT Sensor 2 is also know as the CAC Inlet Temperature Sensor.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Control Module References) for scan tool information
Circuit/System Verification
Note:
* Perform Step 1 of this verification procedure only if the ignition has been OFF for 8 hours or more.
* The vehicle sitting in direct sun light or having the block heater ON will skew the results.
1. Ignition ON, observe the following scan tool parameters. The readings should be within 35°C (63°F) of each other.
* CAC Temperature Sensor
* IAT Sensor 2
2. Engine idling, verify the appropriate scan tool parameters' readings are within the specified range. The readings depend on the current ambient temperature and the vehicle operating conditions.
* -39 to +198°C (-38 to +388°F); Charge Air Cooler Temperature
* -39 to +213°C (-38 to +415°F); IAT Sensor 2
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor as determined in the Circuit/System Verification.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the appropriate low reference circuit terminal 2 or B and ground.
• If greater than the specified range, test the appropriate low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
3. Ignition ON, verify the scan tool parameter of the appropriate temperature sensor is colder than -39°C (-38°F).
• If warmer than the specified range, test the appropriate signal circuit terminal 1 or A for a short to ground. If the circuit tests normal, replace the K20 ECM.
Note: If a short to voltage is found on the sensor signal circuit, the 3A fuse in the jumper wire will open.
4. Install a 3A fused jumper wire between the appropriate signal circuit terminal 1 or A and ground. Verify the appropriate scan tool parameter is warmer than
* 197°C (387°F); Charge Air Cooler Temperature
* 213°C (415°F); IAT Sensor 2
• If colder than the specified range, test the appropriate signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
5. If all circuits test normal, test or replace the appropriate temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Charge Air Temperature Sensor Replacement (Turbocharger) (Charge Air Temperature Sensor Replacement (Turbocharger))Charge Air Temperature Sensor Replacement (Charge Air Outlet Duct) (Charge Air Temperature Sensor Replacement (Charge Air Outlet Duct)) for Charge Air Cooler Temperature Sensor Replacement.
* Charge Air Temperature Sensor Replacement (Turbocharger) (Charge Air Temperature Sensor Replacement (Turbocharger))Charge Air Temperature Sensor Replacement (Charge Air Outlet Duct) (Charge Air Temperature Sensor Replacement (Charge Air Outlet Duct)) for Intake Air Temperature (IAT) Sensor 2 Replacement
* Control Module References (Control Module References) for ECM replacement, setup, and programming