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DTC P0102 or P0103 - LE5, LE9 - With 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

-

P0101, P0103

MAF Sensor Signal

P0102

P0102

P0102

P0102

P0101, P0103, P1101

Ground

-

P0102

P0102

-

P0102

Typical Scan Tool Data

MAF Sensor

Circuit

Normal Range

Short to Ground

Open

Short to Voltage

Ignition 1 Voltage

-

0 Hz

0 Hz

-

MAF Sensor Signal

1,700-9,500 Hz

0 Hz

0 Hz

0 Hz

Ground

-

-

0 Hz

-

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 at least 1 s.
    • The engine speed is at least 300 RPM.
    • The ignition 1 voltage is at least 11.0 V.
    • The above conditions are met for at least 1 s.
    • This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

P0102

The ECM detects that the MAF Sensor parameter is less than 300 Hz (about 3 g/s) for at least 5 s.

P0103

The ECM detects that the MAF Sensor parameter is at least 11,000 Hz (about 200 g/s) for at least 5 s.

Action Taken When the DTC Sets

DTCs P0102 and P0103 are Type B DTC.

Conditions for Clearing the MIL/DTC

DTCs P0102 and P0103 are Type B DTC.

Diagnostic Aids
    • 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 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.

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

Special Tools

J 38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification
    • Verify that DTCs P0685, P0690 or B1380 are not set.
       ⇒If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    • Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 1,700-3,200 Hz (about 2-6 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 2-6 g/s at idle to at least 100 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. Ignition OFF. Disconnect the harness connector at the B75B mass air flow /intake air temperature sensor.
  2. Ignition OFF, 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.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    4. ⇒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.
  4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
    5. ⇒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.
  5. Ignition OFF, connect the red lead of the J 38522 signal generator to the signal circuit terminal A at the B75B mass air flow /inlet air temperature sensor harness connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
  6. Set the J 38522 signal generator Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
  7. Engine Idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
    8. ⇒If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.
  8. If the circuits test normal, test or 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 : LE5 or LE9
    • Control Module References for ECM replacement, setup, and programming
   


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