DTC P0097 or P0098 (LLU)
| DTC P0097 or P0098 (LLU) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0097 00
Intake Air Temperature (IAT) Sensor 2 Circuit Low Voltage
DTC P0098 00
Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Signal Circuit
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P0097 00
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P0098 00
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P0098 00
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-
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Low Reference
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-
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P0098 00
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P0098 00
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-
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| Typical Scan Tool Data |
IAT Sensor 2
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running
Parameter Normal Range: Varies with ambient temperature |
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Signal Circuit
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143°C (289°F)
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-40°C (-40°F)
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-40°C (-40°F)
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Low Reference
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-
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-40°C (-40°F)
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-40°C (-40°F)
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| Circuit/System Description |
The intake air temperature (IAT) sensor 2 is an integral part of the boost pressure sensor. The IAT sensor 2 is a variable resistor that measures the temperature of the air after the turbocharger and the charge air cooler, but before it enters the engine intake manifold. The engine control module (ECM) supplies 5 V to the IAT sensor 2 signal circuit and a ground for the low reference circuit.
| Conditions for Running the DTC |
P0097 00
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The ignition is ON or the engine is running.
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DTC P0097 00 runs continuously within the enabling conditions.
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P0098 00
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The engine is running.
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The ignition is ON.
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The ignition voltage is between 11-18 V.
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DTC P0098 00 runs continuously within the enabling conditions.
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| Conditions for Setting the DTC |
P0097 00
The ECM detects that the IAT sensor 2 is warmer than 140°C (284°F) for greater than 15 s at idle.P0098 00
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 |
DTC P0097 00, P0098 00 are Type D DTCs.
| Conditions for Clearing the DTC |
DTC P0097 00, P0098 00 are Type D DTCs.
| Diagnostic Aids |
Depending on the output from the turbocharger, an IAT sensor 2 signal circuit that is shorted to the boost pressure sensor signal circuit may cause the IAT Sensor 2 parameter response to be erratic or become stuck at a given value.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
If the ignition has been OFF for 8 h or greater, the B75B Mass Air Flow/Intake Air Temperature Sensor (IAT 1), the B111 Turbocharger Boost Sensor (IAT 2), and the B34A Engine Coolant Temperature Sensor 1 should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool IAT Sensor, IAT Sensor 2 and the ECT Sensor parameters. Compare those sensor parameters to each other to determine if the condition is current.
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| 2. |
Engine running, 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.
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| 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.
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| Circuit/System Testing |
| 1. |
Verify that debris is not blocking the airflow through the charge air cooler.
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| 2. |
Ignition OFF for 90 s, disconnect the harness connector at the B111 Turbocharger Boost Sensor.
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| 3. |
Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
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| 4. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 5. |
Ignition ON, verify the scan tool IAT Sensor 2 parameter is colder than -39°C (-38°F).
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| 6. |
If greater than the specified range, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
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| 7. |
Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool IAT Sensor 2 parameter is warmer than 142°C (288°F).
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| 8. |
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 Engine Control Module.
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| 9. |
If the circuits test normal, test or replace the B111 Turbocharger Boost Sensor.
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| Component Testing |
Static Test
Measure and record the resistance of the B111 Turbocharger Boost Sensor (IAT 2) at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance .| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Turbocharger Pressure Sensor Replacement (LLU/A16LET)
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Control Module References
for ECM replacement, setup, and programming
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