2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1861
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohm between the IAT low reference circuit terminal
A and ground.
瀚慖f greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the
ECM.
3. Ignition ON, verify the scan tool IAT parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the
ECM.
4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149
掳C (300掳F).
瀚慖f colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the MAF/IAT sensor.
Component Testing
Measure and record the resistance of the IAT sensor at various ambient temperatures, and then compare those measurements to the Temperature
Versus Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance) table.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup
P0113
DTC P0112 or P0113
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 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
