P007D
DTC P007C or P007D
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)provide an overview of each diagnostic category.
DTC Descriptors
DTC P007C
- Charge Air Cooler (CAC) Temperature Sensor Circuit Low Voltage
DTC P007D
- Charge Air Cooler (CAC) Temperature Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The charge air cooler (CAC) temperature sensor is a variable resistor that measures the temperature of the air from the CAC outlet. The engine control module (ECM) supplies 5 V to the CAC temperature sensor signal circuit, and a ground for the CAC temperature sensor low reference circuit. The ECM continuously monitors the CAC temperature sensor signal for an excessively high or low voltage, or for a start-up signal that is not in correlation with the intake air temperature (IAT) sensor 2 start-up signal. The IAT 2 measures the temperature of the air going to the inlet of the CAC.
Conditions for Running the DTC
P007C or P007D
* The engine is running for longer than 10 s.
* The DTCs run continuously when the enabling condition is met.
Conditions for Setting the DTC
Note: The scan tool display range is between -40 and +199°C (-40 and +390°F).
P007C
The CAC temperature sensor signal is warmer than 250°C (482°F) for longer than 5 s. This is equal to or less than 0.03 V on the CAC temperature sensor signal circuit as measured by the ECM.
P007D
The CAC temperature sensor signal is colder than -53°C (-63°F) for longer than 5 s. This is equal to or greater than 4.8 V on the CAC temperature sensor signal circuit as measured by the ECM.
Action Taken When the DTC Sets
* DTCs P007C and P007D are Type A DTCs.
* The ECM commands reduced engine power.
* The driver information center (DIC) or indicator may display reduced engine power.
* Diesel particulate filter (DPF) regeneration is inhibited.
Conditions for Clearing the DTC
DTCs P007C and P007D are Type A DTCs.
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 known as the CAC Outlet Temperature Sensor.
* The IAT Sensor 2 is located before the inlet to the CAC. The IAT Sensor 2 is also known as the CAC Inlet Temperature Sensor.
* High resistance on either the CAC temperature sensor signal circuit or the CAC temperature sensor low reference circuit could set P007D.
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 (Programming and Relearning)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.
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 sensor
2. Engine idling, observe the scan tool CAC temperature sensor parameter. The reading should be between -39 to +198°C (-38 to +388°F) depending on the current ambient temperature and the vehicle operating conditions.
3. Operate the vehicle within the Conditions for Running the DTC to verify that 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
1. Ignition OFF, disconnect the harness connector at the B193A CAC temperature sensor.
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 low reference circuit terminal B and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
3. Ignition ON, verify the scan tool CAC temperature sensor parameter is colder than -39°C (-38°F).
• If warmer than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
Note: If a short to voltage is found on the CAC temperature sensor signal circuit, the 3A fuse in the jumper wire will open.
4. Install a 3A fused jumper wire between the CAC signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool CAC temperature sensor parameter is greater than 198°C (388°F).
• If less than the specified range, test the 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 B193A CAC temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable (Diesel Particulate Filter (DPF) Regeneration Enable) procedure if the DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration) procedure.
* Charge Air Temperature Sensor Replacement Service and Repair for Charge Air Cooler Temperature Sensor Replacement
* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming