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 in the mass air flow (MAF) sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The engine control module (ECM) supplies 5 V to the signal circuit and a ground for the low reference circuit. The ECM monitors the signal for an excessively high or low voltage.
Conditions for Running the DTCs
* The engine is running for longer than 10 s.
* The battery voltage is more than 11 V.
* DTC P0097 and P0098 run continuously when the above conditions are met.
Conditions for Setting the DTCs
P0097
The IAT Sensor 2 parameter is warmer than 150°C (302°F) for greater than 5 s. This is equal to or less than 0.08 V on the IAT signal circuit as measured by the ECM.
Note: The scan tool display range is between -40 and +150°C (-40 and +302°F).
P0098
The IAT Sensor 2 parameter is colder than -52°C (-61°F) for greater than 5 s. This is equal to greater than 4.9 V on the IAT signal circuit as measured by the ECM.
Action Taken When the DTC Sets
* DTCs P0097 and P0098 are Type B DTCs.
* The driver information center may display Service Emissions System message.
Conditions for Clearing the DTCs
DTCs P0097 and P0098 are Type A DTCs.
Diagnostic Aids
* The (8 Pin) Multifunction Intake Air Sensor (IAT sensor 1) is placed in the air stream ahead of the (5 Pin) Mass Air Flow/Intake Air Temperature (IAT sensor 2). They are both mounted to the air cleaner cover.
* With the ignition ON and the engine OFF, if the engine is cold, a properly functioning IAT sensor 2 will gradually increase the scan tool IAT Sensor 2 parameter. This is due to the heat that is generated by the MAF sensor heating elements.
* Depending on the ambient temperature, an IAT sensor 2 signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0098 to set. This condition can cause a rapid fluctuation in the IAT Sensor 2 parameter.
* An inaccurate IAT sensor 2 and/or 3 may cause P0101 to set. Verify the sensor's operation by varying the air temperature while observing the scan tool parameter and comparing the readings with a thermometer.
* An IAT sensor 2 low reference circuit that is open can cause the IAT Sensor 2 parameter response to be sluggish. This condition may not necessarily set a DTC.
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
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:
* To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 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
2. Verify the following scan tool parameters are within 15°C (27°F) of each other.
* IAT Sensor 1 and 2
* Start-Up ECT Sensor
* Ambient Air Temp. Sensor
• If not within 15°C (27°F)
Refer to Circuit System Testing.
• If within 15°C (27°F)
3. Engine idling.
4. Verify the IAT Sensor 2 parameter is between -39 to +148°C (-38 to +298°F).
• If not between -39 to +148°C (-38 to +298°F)
Refer to Circuit System Testing.
• If between -39 to +148°C (-38 to +298°F)
5. 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.
6. Verify a DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
7. All OK.
Circuit/System Testing
Note:
* You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
* You must perform the Diagnostic Repair Verification after completing the Circuit/System Testing.
1. Ignition OFF, disconnect the harness connector at the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (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 2 ohms between the Intake Air Temperature sensor 2 low reference circuit terminal B and ground.
• If 2 ohms or greater
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open or high resistance in the circuit.
• If less than 2 ohms replace the K20 Engine Control Module.
• If less than 2 ohms
3. Ignition ON, test for 4.8-5.2 V between the intake air temperature sensor 2 signal circuit terminal A and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If greater than 5.2 V
Note: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If between 4.8-5.2 V
4. Test or replace the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT sensor 2).
Component Testing
* Ignition OFF, disconnect the harness connector at the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT sensor 2).
* Measure the resistance between the Intake Air Temperature sensor 2 signal terminal A and the Intake Air Temperature sensor 2 low reference circuit terminal B at the IAT Sensor 2 at the sensor, at several temperatures. Compare the values to the Temperature Vs Resistance table. Refer to Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (Fuel Temperature Sensor)Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (ECT Sensors)Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 1)Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (IAT Sensor 2)Temperature Versus Resistance (EGT Sensors) Temperature Versus Resistance (EGT Sensors)Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (EGR Temperature Sensors)Temperature Versus Resistance (Emission Reduction Fluid Injector) [1][2]Diesel Emissions Fluid (DEF) System for IAT Sensor 2 table. Verify the resistances are within 5 % of the table specifications.
• If not within 5 % of the specifications, replace the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT sensor 2).
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin)Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin) for (5 Pin) Mass Air Flow/Intake Air Temperature sensor (IAT sensor 2) replacement
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is greater than 30 g, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration.
* Control Module References Control Module References for Engine Control Module replacement, programming, and setup