DTC P0111 (LUJ)
Diagnostic Instructions
DTC Descriptor
| DTC P0111 00: Intake Air Temperature (IAT)
Sensor Performance |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
IAT Sensor Signal
|
P0112 00, P0114 00
|
P0113 00, P0114 00
|
P0113 00, P0114 00
|
P0111 00, P0114 00
|
Low Reference
|
-
|
P0113 00, P0114 00
|
P0113 00, P0114 00
|
P0111 00, P0114 00
|
|
| |
Typical Scan Tool Data
IAT Sensor
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: The ignition is
ON, or the engine is running.
Parameter Normal Range: Varies with
ambient temperature.
|
IAT Sensor Signal
|
129°C (264°F)
|
-40°C (-40°F)
|
-40°C (-40°F)
|
Low Reference
|
-
|
-40°C (-40°F)
|
-40°C (-40°F)
|
|
| |
Circuit/System Description
The intake air temperature (IAT) sensor is a variable resistor
and is integrated in the mass air flow meter. The IAT sensor has a
signal circuit and a low reference circuit. The IAT sensor measures
the temperature of the air entering the engine. The engine control
module (ECM) supplies 5 V to the IAT signal circuit, and a ground
for the IAT low reference circuit.
Conditions for Running the DTC
| • |
DTCs P0501 00, P0116 00, P0117
00, P0118 00, P0119 00, P0112 00, P0113 00, P0114 00, P0107 00 or
P0108 00 are not set. |
| • |
The engine run time is greater
than 10 min. |
Conditions for Setting the DTC
The ECM detects that the IAT deviates less than 1.5°C
(35°F) since engine start.
Action Taken When the DTC Sets
DTCs P0111 00 is a Type B DTCs.
Conditions for Clearing the DTC
DTCs P0111 00 is a Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Air Intake System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
If the ignition has been OFF
for 8 h or greater, the B75B Mass Air Flow/Intake Air Temperature
Sensor (IAT 1), the B65 Intake Manifold Pressure and Air
Temperature Sensor (IAT 2) and the B34 Engine Coolant Temperature
Sensor should be within 9°C (16°F) of each other. Ignition
ON, observe the scan tool IAT Sensor, IAT Sensor 2 and the ECT
Sensor parameters. Compare those sensor parameters to each other to
determine if the condition is current. |
| 2. |
Engine running, observe the
scan tool IAT Sensor parameter. The reading should be between -39
to +120°C (-38 to +248°F) depending on the current ambient
temperature and the vehicle operating conditions. |
| 3. |
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 Mass Air Flow/Intake Air Temperature
Sensor. |
| 2. |
Ignition OFF for 90 s, test
for less than 5 Ω between the earth circuit terminal 1 and
earth. |
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
| 3. |
Ignition OFF, test for less
than 5 Ω between the B75B Mass Air Flow/Intake Air
Temperature Sensor (IAT 1) low reference circuit terminal 3 and
earth. |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 4. |
Ignition ON, verify the scan
tool IAT Sensor parameter is colder than -39°C
(-38°F). |
| ⇒ |
If warmer than the specified range, test the
signal circuit terminal 1 for a short to ground. If the circuit
tests normal, replace the K20 Engine Control Module. |
| 5. |
Install a 3 A fused jumper
wire between the B75B Mass Air Flow/Intake Air Temperature Sensor
signal circuit terminal 1 and ground. Verify the scan tool IAT
Sensor parameter is warmer than 130°C (266°F). |
| ⇒ |
If 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 Engine Control Module. |
| 6. |
If all circuits/connections
test normal, replace the B75B Mass Air Flow/Intake Air Temperature
Sensor. |
Component Testing
Static Test
Measure and record the resistance of the B75B Mass Air Flow/Intake
Air Temperature Sensor (IAT 1) at various ambient temperatures,
then compare those measurements to the
Temperature Versus Resistance table.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
