P0096

DTC P0096

CIRCUIT DESCRIPTION




This diagnostic monitors the signal of the intake air temperature (IAT) sensor. The IAT sensor is a variable resistor that measures the temperature of the intake air. The powertrain control module (PCM) supplies 5 volts to the IAT signal circuit and supplies a ground to the low reference circuit. If the PCM detects a low IAT signal voltage, which is a high temperature indication, this DTC sets.




The table illustrates the difference between temperature, resistance, and voltage:

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0096 Intake Air Temperature (IAT) Sensor 2 Performance

CONDITIONS FOR RUNNING THE DTC
- DTC P0097 and P0098 are not set.
- The engine has been OFF for more than 6 consecutive hours.
- The engine is started.
- DTC P0096 runs per drive cycle once the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The difference in temperature between the IAT sensor and the engine coolant temperature (ECT) sensor is more than 26°C (79°F).

ACTION TAKEN WHEN THE DTC SETS
- The PCM illuminates the malfunction indicator lamp (MIL) after 2 consecutive ignition cycles in which the diagnostic runs with the fault active.
- The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS
- Use the Temperature vs Resistance table in order to test the IAT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor could result in a driveability concern. If the engine has sat overnight, the engine coolant temperature and the intake air temperature values should display within a few degrees. If the temperatures are not within 3°C (5°F) of each other, refer to Temperature vs Resistance - Intake Air Temperature (IAT) Sensor.
- An intermittent malfunction may be caused by a fault in the IAT sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-7:

Steps 8-12:

The numbers below refer to the step numbers on the diagnostic table.
1. The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
3. This step checks for a faulty IAT sensor.
5. This step checks the integrity of the IAT sensor input circuit (5-volt reference).
6. This step checks the integrity of the IAT sensor ground circuit.