2010 Cadillac Truck SRX FWD V6-3.0L Page 1133

2010 Cadillac Truck SRX FWD V6-3.0L Page 1133

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine running, observe the scan tool IAT Sensor parameter. The reading should be between -40 to +149掳C (-40 to +300掳F) depending on

the current ambient temperature and the vehicle operating conditions.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.

2. Remove the fuse that supplies B+ to terminal 52 X1 of the ECM.

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm

between the low reference circuit terminal D and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests

normal, replace the K20 ECM.

4. Install fuse that supplies B+ to terminal 52 X1 of the ECM.

5. Ignition ON, verify the scan tool IAT Sensor parameter is colder than -39掳C (-38掳F).

瀚慖f greater than the specified range, test the signal circuit terminal E for a short to voltage. If the circuit tests normal, replace the K20

ECM.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to voltage and the sensor may be damaged.

6. Install a 3 A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool IAT parameter is greater than 149掳C

(300掳F).

瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the K20 ECM.

7. If all circuits test normal, test or replace the B75B MAF/IAT sensor.

Component Testing

Measure and record the resistance of the B66 IAT sensor at various ambient temperatures, then compare those measurements to the Temperature

Versus Resistance - Intake Air Temperature Sensor (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature

Versus Resistance - Intake Air Temperature Sensor) table.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the 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)Mass Airflow Sensor with Intake Air Temperature Sensor

Replacement (LAU) (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 ECM replacement, setup, and programming

P0114

DTC P0112, P0113, or P0114 (LF1)

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