P2199
DTC P2199
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P2199
- Intake Air Temperature (IAT) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The intake air temperature (IAT) sensor 1 and the humidity sensor are integrated within the humidity/intake air sensor body and share the same signal circuit. The IAT sensor 1 signal is displayed by the scan tool as Hertz (Hz) and °C (°F). The engine control module (ECM) supplies 5 V to the signal circuit. Ignition voltage and ground circuits are also supplied to the sensor.
The IAT sensor 2 is a variable resistor that measures the temperature of the air in the mass air flow (MAF) sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The ECM supplies 5 V to the signal circuit and a ground for the low reference circuit.
At engine start-up, after 8 hours of off time, the ECM monitors the IAT sensors 1 and 2 start-up and engine running signals to determine if they are within a reasonable range.
Conditions for Running the DTC
Condition 1
* Ignition has been OFF for 8 hours or more.
* The engine is running.
* The Ambient temperature is warmer than -60°C (-76°F).
OR
Condition 2
* Ignition has been OFF for 8 hours or more.
* The engine is running.
* The Ambient temperature is warmer than -60°C (-76°F).
* In the first 60 s of engine run time, the ECM determines the block heater is OFF.
AND
* In the first 10 minutes of engine run time, the vehicle speed has been at least 24 km/h (15 mph) for at least 5 minutes and the ECM determines there is no sun load.
This DTC runs once per key cycle when the conditions in 1 or 2 are met.
Conditions for Setting the DTC
Condition 1
The ECM determines the absolute temperature difference between the IAT Sensor signals 1 and 2 is more than 100°C (180°F) at start up.
OR
Condition 2
* The ECM determines the absolute temperature difference between the IAT Sensor signals 1 and 2 is more than 20°C (36°F), but less than or equal to 100°C (180°F) after 10 minutes of engine run time.
* The ECM determines the block heater if OFF.
* The ECM determines there is no sun load.
Action Taken When the DTC Sets
DTC P2199 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2199 is a Type B DTC.
Diagnostic Aids
* The following 2 functions of the (8 Pin) Multifunction Intake Air Sensor (IAT sensor 1) are used by the ECM:
- Intake Air Humidity
- Intake Air Temperature (IAT sensor 1)
* The (8 Pin) Multifunction Intake Air Sensor (IAT sensor 1) is placed in the air stream ahead of the (5 Pin) Mass Air Flow/Intake Air Temperature Sensor (IAT sensor 2). They are both mounted to the air cleaner cover.
* The Intake Air Humidity sensor signal and the IAT sensor 1 signal are sent to the ECM on the same circuit. If the Intake Air Humidity parameter displays the value: 0 %, and there are also IAT sensor 1 DTCs, check for a circuit problem.
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the corresponding scan tool IAT Sensor parameter. This is due to the heat that is generated by the humidity and MAF sensor heating elements.
* Skewed temperature sensors may cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note:
* To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.
* The vehicle sitting in direct sun light or having the block heater ON will skew the results.
1. Ignition ON
2. Verify the IAT Sensor 1 and IAT Sensor 2 parameters are within 100°C (180°F) of each other.
• If not within 100°C (180°F)
Refer to Circuit System Testing.
• If within 100°C (180°F)
3. Engine idling.
4. Verify the following scan tool parameters are within the specified ranges.
* IAT Sensor 1; -39 to +145°C (-38 to +293°F)
* IAT Sensor 1; 45 to 302 Hz
* Intake Air Humidity; 5 to 95%
* IAT Sensor 2; -38 to +148°C (-36 to +298°F)
• If one or mores parameters are not within the specified ranges
Refer to Circuit System Testing.
• If all parameters are within the specified ranges
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify a DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
7. All OK.
Circuit/System Testing
Note:
* You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
* You must perform the Diagnostic Repair Verification after completing the Circuit/System Testing.
1. Ignition OFF, disconnect the harness connector at the (8 Pin) B75C Multifunction Intake Air Sensor (IAT sensor 1).
2. Test for less than 2 ohms between the ground circuit terminal 7 and ground.
• If 2 ohms or greater
1. Ignition OFF, disconnect the appropriate engine ground connector.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open or high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 2 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the ignition voltage circuit terminal 5 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
2. Test for less than 2 ohms in the ignition voltage circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
2. Test for infinite resistance between the ignition voltage circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, test all components connected to the ignition voltage circuit and replace as necessary.
• If the test lamp illuminates
5. Test for 4.8-5.2 V between the signal circuit terminal 8 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If greater than 5.2 V
Note: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.
1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If between 4.8-5.2 V
6. Ignition OFF, connect the leads of the J 38522 - Variable Signal Generator as follows:
* Red lead to the signal circuit terminal 8 at the harness connector
* Black lead to ground
* Battery voltage supply lead to B+
7. Set the J 38522 - Variable Signal Generator to the following specifications.
* Signal switch to 5 V
* Duty Cycle switch to 50 % (Normal)
* Frequency switch to 30 Hz
8. Ignition ON, verify the scan tool IAT Sensor 1 parameter is between 28-32 Hz.
• If not between 28-32 Hz
Replace the K20 Engine Control Module.
• If between 28-32 Hz
9. Ignition OFF, disconnect the harness connector at the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT sensor 2).
10. 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 2 ohms between the Intake Air Temperature sensor 2 low reference circuit terminal B and ground.
• If 2 ohms or greater
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open or high resistance in the circuit.
• If less than 2 ohms replace the K20 Engine Control Module.
• If less than 2 ohms
11. Ignition ON, test for 4.8-5.2 V between the intake air temperature sensor 2 signal circuit terminal A and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If greater than 5.2 V
Note: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.
1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If between 4.8-5.2 V
12. Test or replace the appropriate temperature sensor.
Component Testing
IAT Sensor 1
* Test the IAT sensor 1 by varying the sensor temperature while monitoring the temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 1 parameter. The values should be within 5%.
• If not within the specified range, replace the (8 Pin) B75C Multifunction Intake Air Sensor (IAT sensor 1).
IAT Sensor 2
* Ignition OFF, disconnect the harness connector at the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT 2).
* Measure the resistance between the IAT Sensor 2 signal terminal B and the IAT Sensor 2 low reference circuit terminal A at the sensor. Compare the value to the Temperature Vs Resistance table. Refer to Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (Fuel Temperature Sensor)Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (ECT Sensors)Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 1)Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (IAT Sensor 2)Temperature Versus Resistance (EGT Sensors) Temperature Versus Resistance (EGT Sensors)Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (EGR Temperature Sensors)Temperature Versus Resistance (Emission Reduction Fluid Injector) [1][2]Diesel Emissions Fluid (DEF) System table for IAT Sensor 2. Verify the resistance is within 5 % of the specification.
• If not within the specified range, replace the (5 Pin) B75B Mass Air Flow/Intake Air Temperature sensor (IAT 2).
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin)Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin)
for (8 Pin) Multifunction Intake Air Sensor (IAT sensor 1) replacement
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (5 Pin)Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin) Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (8 Pin)
for (5 Pin) Mass Air Flow/Intake Air Temperature Sensor (IAT sensor 2) replacement
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is greater than 30 g, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration.
* Control Module References Control Module References for Engine Control Module replacement, programming, and setup