• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
IAT Sensor 2 Signal | P0097, P0099 | P0098, P0099 | P0098, P0099 | P0098, P0099 | P0096, P2199 |
Low Reference | -- | P0098, P0099 | P0098, P0099 | P0098, P0099 | P0096, P2199 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature | |||
IAT Sensor 2 Signal | 143°C (289°F) | -40°C (-40°F) | -40°C (-40°F) |
Low Reference | -- | -40°C (-40°F) | -40°C (-40°F) |
The intake air temperature (IAT) sensor 2 is integrated with the intake air pressure and 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, 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.
• | DTC P0097, P0098, or P0099 is not set. |
• | The engine coolant temperature (ECT) at start-up is colder than 75°C (167°F). |
• | The ECT reaches a target temperature that is warmer than 60°C (140°F). |
• | The engine is idling. |
• | The mass air flow (MAF) is less than 8 g/s. |
• | The vehicle speed is less than 10 km/h (6 mph). |
AND |
• | The mass air flow (MAF) is between 11-139 g/s. |
• | The vehicle speed is greater than 40 km/h (25 mph). |
• | This DTC runs continuously within the enabling conditions. |
• | The ignition is ON or the engine is running. |
• | This DTC runs continuously within the enabling conditions. |
• | The engine is running. |
• | This DTC runs continuously within the enabling conditions. |
• | The ignition is ON or the engine is running. |
• | This DTC runs continuously within the enabling conditions. |
The ECM detects that the IAT sensor 2 is not within range of a calibrated model for greater than 4 seconds.
The ECM detects that the IAT sensor 2 is warmer than 140°C (284°F) for greater than 15 seconds at idle.
The ECM detects that the IAT sensor 2 is colder than -39°C (-38°F) for greater than 15 seconds at idle.
The ECM detects that the IAT sensor 2 signal is intermittent or has abruptly changed for greater than 4 seconds.
DTCs P0096, P0097, P0098, P0099 are Type B DTCs.
DTCs P0096, P0097, P0098, P0099 are Type B DTCs.
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.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information.
• | If the ignition has been OFF for 8 hours or greater, the IAT sensor, the IAT sensor 2, and the engine coolant temperature (ECT) sensor 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. |
• | 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. |
• | 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. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | 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 ECM. |
⇒ | 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. |
Measure and record the resistance of the IAT sensor 2 at various ambient temperatures, then compare those measurements to the Temperature vs Resistance table. Refer to Temperature Versus Resistance.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |