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DTC P0101

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0101 11: Mass Air Flow (MAF) Sensor Performance High Input

DTC P0101 12: Mass Air Flow (MAF) Sensor Performance Low Input

Circuit/System Description

The mass air flow sensor is located in the air intake duct. The mass air flow sensor is an airflow meter that measures the amount of air that enters the engine. The mass air flow sensor uses a hot film that is cooled by air flowing past the sensing film as air enters the engine. The amount of cooling is proportional to the amount of the air flow. As the air flow increases, greater current is required in order to maintain the hot film at a constant temperature. The engine control module (ECM) uses the mass air flow sensor in order to provide the correct fuel delivery for all operating conditions.

Conditions for Running the DTC
    • The ignition is ON.
    • The battery voltage is greater than 8.5 V.
    • The engine speed is between 1 000-4 000 RPM.

Conditions for Setting the DTC

The ECM detects the mass air flow sensor signal circuit is greater than, or less than, the normal operating range for less than 1 s.

Action Taken When the DTC Sets

DTC P0101 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0101 is a Type B DTC.

Diagnostic Aids
    • Inspect the harness of the mass air flow sensor to verify that it is not routed too close to the following components:
       - Any solenoids
       - Any relays
       - Any motors
    • Inspect for any contamination, water intrusion, or debris on the sensing elements of the mass air flow sensor. If debris is present, clean the sensor. If the sensor cannot be cleaned, replace the sensor.
    • A high resistance may cause a driveability concern before this DTC sets.
    • An engine mechanical condition may set this DTC. Inspect for worn valve train components. Refer to Symptoms - Engine Mechanical .

Reference Information

Schematic Reference

Engine Controls Schematics : LLW

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Engine running for 1 min., observe the DTC information with a scan tool. DTC P0101 should not set.
  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.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the B75 Mass Air Flow Sensor.
  2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, repair the ground circuit for an open/high resistance.

    Caution: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.

  3. Ignition ON, test for battery voltage between the ignition circuit terminal 4 and ground.
    4. ⇒If less than the specified range, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  4. Test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
    5. ⇒If less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    ⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  5. If all circuits test normal, test or replace the B75 Mass Air Flow Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Mass Airflow Sensor with Inlet Air Temperature Sensor Replacement
    • Control Module References for engine control module replacement, setup, and programming
   


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