P0097
DTC P0097 or P0098
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 P0097
- Intake Air Temperature (IAT) Sensor 2 Circuit Low Voltage
DTC P0098
- Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The intake air temperature (IAT) sensor 2 is a variable resistor that measures the temperature of the air going to the inlet of the charge air cooler (CAC). The engine control module (ECM) supplies 5 V to the IAT sensor 2 signal circuit, and a ground for the IAT sensor 2 low reference circuit. The ECM continuously monitors the IAT sensor 2 signal for an excessively high or low voltage, or for a start-up temperature signal that is not in correlation with the CAC Temperature Sensor start-up signal.
Conditions for Running the DTC
P0097 or P0098
* 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 +215°C (-40 and +419°F).
P0097
The IAT sensor 2 is warmer than 250°C (482°F) for longer than 5 s. This is equal to or less than 0.03V on the IAT Sensor 2 signal circuit as measured by the ECM.
P0098
The IAT sensor 2 is colder than -53°C (-63°F) for longer than 5 s. This is equal to or greater than 4.8V on the IAT Sensor 2 signal circuit as measured by the ECM.
Action Taken When the DTC Sets
DTCs P0097 and P0098 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0097 and P0098 are Type B DTCs.
Diagnostic Aids
* Skewed temperature sensors may cause this DTC to set.
* 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.
* 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.
* High resistance on either the IAT Sensor 2 signal circuit or the IAT Sensor 2 low reference circuit could set these DTCs.
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 +213°C (-38 to +415°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 B66B IAT sensor 2.
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 2 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 IAT Sensor 2 parameter is colder than -39°C (-38°F).
• If warmer than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 ECM.
Note: If a short to voltage is found on the IAT sensor 2 signal circuit, the 3A fuse in the jumper wire will open.
4. Install a 3A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool IAT Sensor 2 parameter is warmer than 213°C (415°F).
• If colder 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 B66B IAT sensor 2.
Repair Instructions
* Intake Air Temperature (IAT) Sensor 2 Replacement (Intake Air Temperature (IAT) Sensor 2 Replacement)
* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
5. Duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.
6. Engine running, observe the scan tool Soot Mass parameter.
• If the Soot Mass value is less than 30 grams, perform the Diesel Particulate Filter (DPF) Regeneration Enable (Diesel Particulate Filter (DPF) Regeneration Enable).
• If the Soot Mass value is greater than 30 grams, perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration).