2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1056

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1056

Circuit Description

The intake air temperature (IAT) sensor is an integral part of the Intake Manifold Pressure and Air Temperature sensor. The IAT sensor is a

variable resistor that measures the temperature of the intake air. The engine control module (ECM) supplies 5 V to the IAT signal circuit and

supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

Conditions for Running the DTC

P0111 Idle Test

* Before the ECM can report DTC P0111 failed, DTC P0101 must run and pass.

* DTC P0112, P0113, P0116, P0117, P0118, P0119, P0125, or P0128 is not set.

* The engine coolant temperature (ECT) at engine start is colder than 120掳C (248掳F).

* The ECT is warmer than 60掳C (140掳F).

* The vehicle speed is less than 3 km/h (2 mph).

* DTC P0111 runs continuously when the above conditions are met for greater than 2 s.

P0111 Cruise Test

* Before the ECM can report DTC P0111 failed, DTC P0101 must run and pass.

* DTC P0112, P0113, P0116, P0117, P0118, P0119, or P0128 is not set.

* The ECT at engine start is colder than 120掳C (248掳F).

* The ECT is warmer than 75掳C (167掳F).

* The vehicle speed is greater than 40 km/h (25 mph).

* The MAF is between 15.6 and 250 g/s.

* Decel fuel cut-off is not active.

* DTC P0111 runs continuously when the above conditions are met for greater than 2 s.

P0111 Rationality Test

* The ECT at engine start is warmer than 35掳C (95掳F).

* The ECT at last engine shut down was warmer than 80掳C (176掳F).

* Since last shut down, the ECT has decreased more than 40掳C (69掳F).

* DTC P0111 runs continuously when the above conditions are met for greater than 20 s.

P0112 and P0113

* The engine run time is greater than 15 s.

* The engine is idling for greater than 3 s.

* The IAT is colder than 35掳C (95掳F).

* The IAT change is more than 2.3掳C (4.1掳F).

* The DTCs runs continuously when the above conditions are met fro greater than 2 s.

P0114

* The ignition is ON.

* The DTCs runs continuously within the enabling conditions.

Conditions for Setting the DTC

P0111

* The ECM detects that the IAT remains steady within 2掳C (4掳F) during the idle test.

* The ECM detects that the IAT decreased less than 2掳C (4掳F) during the cruise test.

* Any of the above conditions exists for greater than a cumulative of 45 s for the cruse test or 55 s for the idle test.

* The ECM detects that the difference between the IAT and the ECT less than -20掳C (-36掳F) OR more than 35掳C (63掳F).

* The above condition exists for greater than 2 s.