2010 Cadillac CTS Sedan AWD V6-3.6L Page 1016
Note: A thermometer can be used to test the sensor off the vehicle.
2. Test the B66 IAT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the
Temperature Versus Resistance - Intake Air Temperature Sensor (See: Powertrain Management/Computers and Control
Systems/Specifications) table and verify that the resistance is within 5 % of the specification.
瀚慖f not within the specified, replace the B75B MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LLT) (See: Powertrain Management/Computers and Control
Systems/Air Temperature Sensor ( Ambient / Intake )/Service and Repair)Mass Airflow Sensor with Intake Air Temperature Sensor
Replacement (LSA) (See: Powertrain Management/Computers and Control Systems/Air Temperature Sensor ( Ambient / Intake )/Service
and Repair)Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LF1) (See: Powertrain Management/Computers and
Control Systems/Air Temperature Sensor ( Ambient / Intake )/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for engine control module replacement, setup, and
programming
P0112
DTC P0111-P0113 (w/LLT)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptors
DTC P0111
- Intake Air Temperature (IAT) Sensor Circuit Performance
DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The intake air temperature (IAT) sensor is an integral part of the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures
the temperature of the intake air. The engine control module (ECM) supplies 5 V to the IAT signal circuit and supplies a ground to the low
