FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2010 >> Express 4500 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0098 >> VIN 6

VIN 6




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 engine intake manifold. The engine control module (ECM) supplies 5V 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 voltage for an excessively high or low voltage, or a voltage signal that is not in correlation with the engine coolant temperature (ECT) sensor.

Conditions for Running the DTC

* The ignition is ON or the engine is running.
* The DTCs run continuously when the enabling conditions are met.

Conditions for Setting the DTC

P0097

The IAT sensor 2 is greater than 148°C (298°F) for greater than 1 second. This is equal to or less than 0.10V on the IAT sensor 2 signal circuit as measured by the ECM.

P0098

The IAT sensor 2 is less than -39°C (-38°F) for greater than 1 second. 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.
* Diesel particulate filter (DPF) regeneration is inhibited.

Conditions for Clearing the DTC

DTCs P0097 and P0098 are Type B DTCs.

Diagnostic Aids

* If the engine has sat overnight, the IAT sensor 2 and the ECT sensor values should display within 15°C (27°F).
* High resistance on either the IAT sensor 2 signal circuit or the IAT sensor 2 low reference circuit could set this DTC.

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

1. Ignition ON, observe the scan tool IAT Sensor 2 parameter. The reading should be between -39 to 120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
2. 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

1. Ignition OFF, disconnect the harness connector at the IAT sensor 2.
2. Ignition OFF, for 90 seconds, 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 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 A for a short to ground. If the circuit tests normal, replace the ECM.

Note: If a short to voltage is found on the IAT signal circuit, the 3A fuse in the jumper wire will open.

4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool IAT Sensor 2 parameter is greater than 130°C (266°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 ECM.

5. If all circuits test normal, test or replace the IAT sensor 2.

Component Testing

Static Test
1. Ignition OFF, disconnect the harness connector at the IAT sensor 2.
2. Measure the resistance between the signal terminal A and the low reference circuit terminal B.
3. Compare the value to the Temperature Vs Resistance table. Verify the resistance is within 9 percent of the specification. 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)).

• If not within the specified range, replace the IAT sensor 2.

Dynamic Test

Note: A thermometer can be used to test the sensor off the vehicle in heated water.

1. Test the IAT sensor 2 by varying the sensor temperature while monitoring the sensor resistance.
2. Compare the readings with the Temperature Vs Resistance table and verify that the resistance is within 9 percent of the specification.

• If not within the specified range, replace the 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. Turn OFF the ignition for 90 seconds.
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).

pro multis Credits:Operation CHARM About Operation CHARM