P0098
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) provides 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 integrated with the Intake Manifold Pressure and Air Temperature Sensor. The IAT sensor 2 is a variable resistor that measures the temperature of the air after the turbocharger and the charge air cooler (CAC), and before it enters the engine intake manifold. The engine control module (ECM) supplies 5 volts to the IAT sensor 2 signal circuit and a ground for the low reference circuit.
Conditions for Running the DTC
P0097
* The ignition is ON or the engine is running.
* This DTC runs continuously within the enabling conditions.
P0098
* The engine is running.
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
P0097
The ECM detects that the IAT sensor 2 is warmer than 140°C (284°F) for greater than 15 s at idle.
P0098
The ECM detects that the IAT sensor 2 is colder than -39°C (-38°F) for greater than 15 s at idle.
Action Taken When the DTC Sets
DTCs P0097, P0098 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0097, P0098 are Type B DTCs.
Diagnostic Aids
* Depending on the output from the turbocharger, an IAT sensor 2 signal circuit that is shorted to the intake air pressure signal circuit may cause the IAT Sensor 2 parameter response to be erratic or become stuck at a given value.
* The Intake Manifold Pressure and Air Temperature Sensor may also be referred to as Turbocharger Boost Sensor or Intake Air Pressure and 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 (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.
* 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 9°C (16°F) of each other.
* IAT Sensor 1
* IAT Sensor 2
* Start-Up ECT Sensor
2. Engine idling, observe the scan tool IAT Sensor 2 parameter. The reading should be between -39 to +130°C (-38 to +266°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 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. Verify that debris is not blocking the airflow through the CAC.
2. Ignition OFF, disconnect the harness connector at the B65 Intake Manifold Pressure and Air Temperature Sensor.
Caution: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.
3. 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 1 or A 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.
4. 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 2 or B for a short to ground. If the circuit tests normal, replace the K20 ECM.
Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 or B and ground. Verify the scan tool IAT Sensor 2 parameter is warmer than 142°C (288°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.
6. If the circuits test normal, test or replace the B65 Intake Manifold Pressure and Air Temperature Sensor.
Component Testing
Measure and record the resistance of the IAT sensor 2 at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance (IAT 2) (Temperature Versus Resistance (IAT 2))Temperature Versus Resistance (ECT) (Temperature Versus Resistance (ECT))Temperature Versus Resistance (IAT) (Temperature Versus Resistance (IAT)) table.
Repair Instructions
* Intake Air Pressure and Temperature Sensor Replacement (Intake Air Pressure and Temperature Sensor Replacement) for Intake Manifold Pressure and Air Temperature Sensor
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming
Repair Verification
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.