DTC P0111-P0114 (LAU)
| DTC P0111-P0114 (LAU) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0111
Intake Air Temperature (IAT) Sensor Circuit Performance
DTC P0112
Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
Intake Air Temperature (IAT) Sensor Circuit High Voltage
DTC P0114
Intake Air Temperature (IAT) Sensor Intermittent
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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IAT Sensor Signal
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P0112, P0114
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P0111, P0113, P0114
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P0113, P0114*
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P0111, P0114
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Low Reference
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-
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P0111, P0113, P0114
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P0113, P0114*
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P0111, P0114
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* Internal ECM or sensor damage may occur if the circuit is shorted to B+
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| Typical Scan Tool Data |
IAT Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine operating in Closed Loop.
Parameter Normal Range: -39 to +127°C (-38 to +260°F). Varies with outside temperature. |
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IAT Sensor Signal
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129°C (264°F)
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-40°C (-40°F)
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-40°C (-40°F)*
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Low Reference
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-
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-40°C (-40°F)
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-40°C (-40°F)*
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* Internal ECM or sensor damage may occur if the circuit is shorted to B+
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| 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 a ground for the IAT low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
| IAT | IAT Resistance | IAT Signal Voltage |
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Cold
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High
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High
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Warm
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Low
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Low
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| Conditions for Running the DTC |
P0111 Idle Test
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Before the ECM can report DTC P0111 failed, DTC P0101 must run and pass.
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DTC P0112, P0113, P0116, P0117, P0118, P0119, P0125, or P0128 is not set.
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The engine coolant temperature (ECT) at engine start is colder than 120°C (248°F).
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The ECT is warmer than 60°C (140°F).
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The vehicle speed is less than 3 km/h (2 mph).
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DTC P0111 runs continuously when the above conditions are met for greater than 2 s.
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P0111 Cruise Test
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Before the ECM can report DTC P0111 failed, DTC P0101 must run and pass.
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DTC P0112, P0113, P0116, P0117, P0118, P0119, or P0128 is not set.
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The ECT at engine start is colder than 120°C (248°F).
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The ECT is warmer than 75°C (167°F).
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The vehicle speed is greater than 40 km/h (25 mph).
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The MAF is between 15.6 and 250 g/s.
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Decel fuel cut-off is not active.
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DTC P0111 runs continuously when the above conditions are met for greater than 2 s.
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P0111 Rationality Test
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The ECT at engine start is warmer than 35°C (95°F).
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The ECT at last engine shut down was warmer than 80°C (176°F).
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Since last shut down, the ECT has decreased more than 40°C (69°F).
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DTC P0111 runs continuously when the above conditions are met for greater than 20 s.
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P0112 and P0113
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The engine run time is greater than 15 s.
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The engine is idling for greater than 3 s.
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The IAT is colder than 35°C (95°F).
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The IAT change is more than 2.3°C (4.1°F).
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The DTCs runs continuously when the above conditions are met fro greater than 2 s.
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P0114
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The ignition is ON.
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The DTCs run continuously within the enabling conditions.
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| Conditions for Setting the DTC |
P0111
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The ECM detects that the IAT remains steady within 2°C (4°F) during the idle test.
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The ECM detects that the IAT decreased less than 2°C (4°F) during the cruise test.
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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.
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The ECM detects that the difference between the IAT and the ECT less than -20°C (-36°F) OR more than 35°C (63°F).
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The above condition exists for greater than 2 s.
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P0112
The ECM detects that the intake air temperature is warmer than 132°C (270°F) for greater than 4 s or a cumulative of 30 s.P0113
The ECM detects that the intake air temperature is colder than -42°C (-43.6°F) and remains steady within 3°C (5°F) during a cumulative air flow of greater than 999 grams. The scan tool is limited to -40°C (-40°F), so the diagnostic procedure uses -39°C (-38°F) to determine if there is an IAT condition. The condition exists for greater than 4 s or a cumulative of 30 s.P0114
The ECM detects that the IAT sensor signal is intermittent or has abruptly changed for period of time greater than 5 s.| Action Taken When the DTC Sets |
DTCs P0111, P0112, P0113, and P0114 are Type B DTCs.
| Conditions for Clearing the MIL/DTC |
DTCs P0111, P0112, P0113, and P0114 are Type B DTCs.
| Diagnostic Aids |
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If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should be within 3°C (5°F).
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High resistance on the IAT sensor signal circuit could set a DTC.
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| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 35616 Connector Test Adapter Kit
| Circuit/System Verification |
| 1. |
Allow the engine to idle. Diagnostic trouble codes P0111, P0112, P0113 or P0114 must not be activated.
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| 2. |
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.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B65 Intake Manifold Pressure and Air Temperature sensor.
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| 2. |
Remove the fuse that supplies B+ to terminal 56 X2 of the ECM.
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| 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 Ω between the low reference circuit terminal 1 and ground. |
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Warning
| 4. |
If 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.
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| 5. |
Install the fuse that supplies B+ to terminal 56 X2 of the ECM.
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| 6. |
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground
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| 7. |
If 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.
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| 8. |
If 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.
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| 9. |
Ignition ON, verify that the scan tool IAT sensor parameter is colder than -39°C (-38°F).
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| 10. |
If 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.
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| 11. |
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°C (263°F). |
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| 12. |
If 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.
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| 13. |
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°C (-38°F). |
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| 14. |
If warmer than the specified value, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the K20 ECM.
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| 15. |
If all circuits/connections test normal, test or replace the B65 Intake Manifold Pressure and Air Temperature sensor.
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| Component Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B65 Intake Manifold Pressure and Air Temperature sensor.
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| 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 table and verify that the resistance is within 5 % of the specification. |
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| 3. |
If not within the specified range, replace the B65 Intake Manifold Pressure and Air Temperature sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Turbocharger Pressure Sensor Replacement
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Control Module References
for Engine Control Module replacement, setup, and programming
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