P0111

P0111-INTAKE AIR TEMPERATURE SENSOR 1 PERFORMANCE





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams. Electrical Diagrams

The Intake Manifold Temperature Sensor is located on the intake manifold and is used to measure the temperature of the air in the intake manifold of the engine. The Engine Control Module (ECM) supplies 5 volts to the intake manifold temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature. The MIL lamp is illuminated immediately when the diagnostic runs and fails. During this time the customer may notice periods of white smoke as well as the fan running more often. The MIL lamp is turned off once the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:
Key on engine off and while engine is running.

- Set Condition:
At key on engine off, the intake air temperature sensor reads differently than the battery temperature and ambient air temperature sensors. Or while the engine is running the ECM does not read a change in value from the intake air temperature sensor over time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. INTAKE AIR TEMPERATURE SENSOR
1. Remove the temperature sensor and reconnect the wiring to the sensor.
2. With the scan tool in Sensors, Monitor the Intake Air Temperature.
3. While heating the sensor with an external heat source (DO NOT USE OPEN FLAME).

Does the reading from the sensor increase at least (5°F) on the scan tool?

Yes

- Go To 2

No

- Replace the Intake Air Temperature Sensor.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

2. INTAKE AIR TEMPERATURE SENSOR
1. After an eight hour cold soak, connect the scan tool and monitor intake air temperature, battery temperature, and coolant temperature.

NOTE: Make sure ambient air temperature is above -6.7°C (20°F) when performing this test.

NOTE: Make sure there is no external heat source, such as a block heater, operating during this test or within the 8 hour cold soak.

Does the Intake Air Temperature Sensor read differently from the other sensors?

Yes

- Replace the Intake Air Temperature Sensor.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Perform the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition Test.