2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1058
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 1 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/connections test normal, replace the K20 ECM.
4. Install fuse that supplies B+ to terminal 56 X2 of the ECM.
5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the K20 ECM.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. Ignition ON, verify that the scan tool IAT sensor parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit/connections test normal, replace
the K20 ECM.
Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
7. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the IAT sensor parameter is warmer
than 128掳C (263掳F).
瀚慖f colder than the specified value, test the signal circuit terminal 2 for an open or short to voltage. If the circuit/connections test normal,
replace the K20 ECM.
8. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3.
Verify the IAT sensor parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified value, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the K20
ECM.
9. If all circuits/connections test normal, test or replace the B65 Intake Manifold Pressure and Air Temperature sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the B65 Intake Manifold Pressure and Air Temperature sensor.
Note: A thermometer can be used to test the sensor off the vehicle.
2. Test the 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/Temperature Versus Resistance - Intake Air Temperature Sensor) table and verify that the resistance is within 5 % of
the specification.
瀚慖f not within the specified range, replace the B65 Intake Manifold Pressure and Air Temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Turbocharger Pressure Sensor Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Turbocharger/Service and
Repair/Turbocharger Pressure Sensor Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and
programming
P0113
DTC P0111-P0114 (LAU)
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.
