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DTC P0102 or P0103 - Without Special Tool

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 P0102: Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103: Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

Ignition 1 Voltage

P0102

P0101

P0102

P0690

P0101, P0103

MAF Sensor Signal

P0102

P0102

P0102

P0102

P0101, P0103, P1101

Ground

-

P0102

P0102

-

P0102

Circuit/System Description

The mass air flow (MAF) sensor is integrated with the inlet 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. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s).

Conditions for Running the DTC
    • The engine is running for greater than 1 s.
    • The ignition 1 signal is greater than 8 V.
    • The above conditions are met for greater than 1 s.
    • The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0102

The ECM detects that the MAF Sensor Signal parameter is less than 500 Hz (about 0.9 g/s) for greater than 10 s.

P0103

The ECM detects that the MAF Sensor Signal parameter is greater than 14,500 Hz (about 425 g/s) for greater than 10 s.

Action Taken When the DTC Sets

DTCs P0102 and P0103 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0102 and P0103 are Type B DTCs.

Diagnostic Aids
    • Verify the integrity of the air induction system by inspecting for the following conditions:
       - Loose or improper installation
       - Damaged components
       - Any water intrusion in the induction system
       - Any contamination or debris on the sensing elements of the MAF sensor
    • A steady or intermittent high resistance of 15 Ω or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
    • 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 cause the MAF sensor signal to be skewed or erratic. Additionally, it may cause a rapid fluctuation in the IAT Sensor parameter.
    • Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories

Reference Information

Schematic Reference

Engine Controls Schematics

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
    • Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz (about 2-8 g/s) depending on the engine coolant temperature (ECT).
    • 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 2-8 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
    • 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. Verify that the following DTCs are not set: P0685, P0690 or B1380.
    2. ⇒If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Ignition OFF, disconnect the harness connector at the B75B mass air flow/intake air temperature sensor.
  3. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 Ω between the ground circuit terminal B and ground.
    4. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    5. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
    ⇒If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
    6. ⇒If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    ⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. If all other circuits test normal, replace the B75B mass air flow/intake air temperature 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 ECM replacement, setup, and programming
   


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