2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1758

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1758

3. Install a jumper wire between the low reference circuit of the MAP sensor and ground.

4. Install a jumper wire at the MAP sensor signal circuit.

5. Connect a DMM between the jumper wire from the MAP sensor signal circuit and ground.

6. Install the J-35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The

voltage should vary between 0-5.2 volts without any spikes or dropouts.

瀚慖f the voltage is not within the specified range or is erratic, replace the MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold

Pressure/Vacuum Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0112

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

Circuit/System Description

The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal

circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)

supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.

Conditions for Running the DTC

P0112

* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.

* The engine is running for greater than 10 s.

* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).