DTC P0101
| DTC P0101 |
| 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 Descriptor |
DTC P0101
Mass Air Flow (MAF) Sensor Performance
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open /High Resistance | Short to Voltage | Signal Performance |
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Ignition Voltage
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P0031, P0037, P0100, P0458
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P0100
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-
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P0100
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MAF Sensor Signal
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P0100
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P0100
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P0100
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P0101, P0102, P0103
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Ground
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-
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P0100
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-
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P0100
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| Typical Scan Tool Data |
MAF Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running at various operating conditions
Parameter Normal Range: 1,700-12,500 Hz |
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Ignition Voltage
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65,535 Hz
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65,535 Hz
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-
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MAF Sensor Signal
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65,535 Hz
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65,535 Hz
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65,535 Hz
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Ground
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-
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65,535 Hz
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-
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| Circuit/System Description |
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. The sensor has the following circuits:
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Ignition voltage
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MAF sensor ground
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MAF Sensor Signal
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IAT sensor signal
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IAT low reference
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The purpose of this diagnostic is to analyze the performance of the MAF sensor by comparing the measured airflow to the following 2 distinct models:
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The first model is separated into two parts. The first part is based on basic engine parameters and uses engine speed, and throttle angle as inputs. The second part is derived from long term fuel trim, at cruising speed and the ECM is looking for an adaptation value to be within a calibrated range.
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The second model uses the manifold absolute pressure (MAP) sensor for input, and the ECM is looking for an adaptation value to be within a calibrated range.
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| Conditions for Running the DTC |
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DTCs P0010, P0011, P0013, P0014, P0096, P0097, P0098, P0099, P0100, P0102, P0103, P0106, P0107, P0108, P0121, P0122, P0123, P0221, P0222, P0223, P0236, P0237, P0238, P0335, P0336, P2088, P2089, P2090, P2091, P2176, P2227, P2228, or P2229 is not set.
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The engine is running.
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The engine coolant temperature (ECT) is warmer than 10°C (50°F).
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The ignition 1 signal is greater than 10.5 V.
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The change in the throttle position (TP) is less than 2%.
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The turbocharger bypass valve is closed.
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Long term cruise fuel trim needs to be active and stable.
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This DTC runs continuously within the enabling conditions.
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| Conditions for Setting the DTC |
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The ECM detects that the measured MAF is not within range of the calculated airflow based on throttle angle and engine speed.
AND |
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The ECM detects a significant error in the long term fuel trim at cruising speed.
OR |
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The ECM detects that the measured MAF is not within range of the calculated model that is derived from MAP.
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| Action Taken When the DTC Sets |
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DTC P0101 is a Type B DTC.
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The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.
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| Conditions for Clearing the MIL/DTC |
DTC P0101 is a Type B DTC.
| Diagnostic Aids |
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The charge air cooler (CAC) is connected to the turbocharger and to the throttle body by flexible ductwork that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the ductwork, the tightening specifications and proper positioning of the clamps is critical and must be strictly adhered to.
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Use a solution of dish soap and water in a spray bottle to pinpoint any suspected air leaks in the induction system and in the CAC assembly.
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A steady or intermittent high resistance of 15 Ω or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
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Certain types of contaminants on the MAF sensor heating elements act as a heat insulator, which will impair the response of the sensor to airflow changes. This condition will affect the Long Term Fuel Trim adaptation value.
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Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
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| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
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Turbocharger System Description (LDK with Turbocharger)
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Boost Control System Description (LDK with Turbocharger)
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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
EL 38522 Variable Signal Generator Variable Signal Generator
For equivalent regional tools, refer to Special Tools .
| Circuit/System Verification |
| 1. |
Verify that restrictions do not exist in the exhaust system. Refer to
Restricted Exhaust
.
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| 2. |
Verify that an exhaust leak does not exist, including the mating surface area between the turbocharger and the exhaust manifold.
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| 3. |
Ignition OFF for 90 s, determine the current vehicle testing altitude.
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| 4. |
Ignition ON, engine OFF, observe the scan tool BARO parameter, Boost Pressure Sensor parameter, and MAP Sensor parameter. Compare the parameters to the
Altitude Versus Barometric Pressure
table. The parameters should be within the specified range indicated in the table.
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| 5. |
Engine operating at idle, observe the scan tool MAF Sensor parameter. The reading should be between 1,700-2,600 Hz.
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| 6. |
A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This increase should be from 2-6 g/s at idle to greater than 200 g/s at the time of the 1-2 shift.
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| 7. |
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 |
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Verify the integrity of the entire air induction system including all turbocharger components by inspecting for the following conditions:
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Any damaged components
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Loose or improper installation
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An air flow restriction
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Vacuum leaks
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A turbocharged air leak
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Improperly routed vacuum hoses
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In cold climates, inspect for any snow or ice buildup
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Inspect the MAF sensor elements for contamination
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| 2. |
Ignition OFF, disconnect the harness connector at the B75B mass air flow (MAF)/intake air temperature (IAT) sensor.
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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 ground circuit terminal B and ground.
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| 4. |
If more than the specified range, test the ground circuit for an open/high resistance.
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Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
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| 6. |
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
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| 7. |
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
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| 8. |
If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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| 9. |
If more than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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| 10. |
Ignition OFF, connect the red lead of the
EL 38522
Generator to the signal circuit terminal A at the MAF sensor harness connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
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| 11. |
Set the
EL 38522
Generator Signal switch to 5 V, the Frequency switch to 5 K, and the Duty Cycle switch to Normal.
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| 12. |
Engine Idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz.
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| 13. |
If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.
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| 14. |
If all circuits test normal, test or replace the MAF sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Mass Airflow Sensor Replacement
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Control Module References
for ECM replacement, setup, and programming
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