2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1065

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1065

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

P0116

DTC P0116 or P050C (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.

DTC Descriptors

DTC P0116

- Engine Coolant Temperature (ECT) Sensor Performance

DTC P050C

- Cold Start Engine Coolant Temperature (ECT) Performance

Diagnostic Fault Information

Typical Scan Tool Data