• | 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 | P0096 | P0098 | P0098* | P0096 |
Low Reference | -- | P0096 | P0098 | * | P0096 |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
---|---|---|---|---|
IAT Sensor Signal | P0112 | P0113 | P0113 | P0113* |
Low Reference | -- | -- | -- | * |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+. |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Key ON, engine OFF Parameter Normal Range: Varies between -39 to +120°C (-38 to +248°F) | |||
IAT Sensor 2 Signal | 150°C (300°F) | -40°C (-40°F) | -40°C (-40°F)* |
Low Reference | -- | -40°C (-40°F) | -40°C (-40°F)* |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+ |
Circuit | Short to Ground | Open or High Resistance | Short to Voltage |
---|---|---|---|
Parameter Normal Range: Varies between -39 to +120°C (-38 to +248°F) | |||
IAT Sensor 1 Signal | 140°C (284°F) | -40°C (-40°F) | -40°C (-40°F)* |
Low Reference | -- | -- | -- |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+ |
The intake air temperature (IAT) sensor 2 is a variable resistor. The IAT sensor 2 measures the temperature of the air at the engine intake manifold. The engine control module (ECM) supplies 5 volts to the IAT sensor 2 signal circuit, and a ground for the IAT sensor 2 low reference circuit. When the IAT sensor 2 is cold, the sensor resistance is high. When the intake manifold air temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the IAT sensor 2 signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the IAT sensor 2 signal circuit. The ECM monitors the IAT sensor 2 and the IAT sensor signal voltages for a voltage that is not within a calibrated range of each other.
• | DTCs P0097, P0098, P0112, P0113, P0116, P0117, P0118, P0128, P0500, P0502, P0603 are not set. |
• | DTC P0116 has run and passed. |
• | The engine has been OFF for greater than 8 hours. |
• | The IAT sensor is greater than 10°C (50°F). |
• | DTC P0096 runs once per key cycle within the enabling conditions. |
• | DTC P0116 must run and pass. |
• | At start-up, after an 8 hour engine soak time, the IAT sensor 2 temperature is greater than 20°C (36°F) higher or lower than the IAT sensor. |
DTC P0096 is a Type B DTC.
DTC P0096 is a Type B DTC.
• | An IAT sensor that is skewed lower at various ambient temperatures, due to greater resistance than is normal, can widen the spread between the 2 sensors and cause this DTC to set. Measure and record the resistance of the IAT sensor and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature Versus Resistance. |
• | Inspect both IAT sensors terminals, for corrosion or a poor connection. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Important: Perform this verification procedure only if the ignition has been OFF for eight hours or more.
⇒ | 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 greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, repair the open/high resistance in the circuit. |
⇒ | If greater than the specified range, repair the open/high resistance in the circuit. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |