P0102
DTC P0100-P0103
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 Descriptors
DTC P0100
- Mass Air Flow (MAF) Sensor Circuit
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The control module uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. The MAF sensor is a hot wire design. A platinum hot wire and a thermistor are located in the intake air bypass passage of the MAF sensor housing. The temperature of the platinum hot wire is affected by exposure to air flow and by exposure to air temperature. The platinum hot wire is maintained at a set temperature by controlling the current flow through the wire. The MAF sensor converts the changes in current flow to a voltage signal. The voltage signal from the MAF sensor enables the PCM to detect changes in air density and changes in air volume.
Conditions for Running the DTC
* The ignition is ON or the engine is running.
* DTC P0100, P0102, and P0103 run continuously when the above conditions are met.
Conditions for Setting the DTC
P0100
The PCM detects an open or a short in the MAF sensor signal.
P0102
The MAF sensor signal is less than 0.2 volt, for greater than 3 seconds.
P0103
The MAF sensor signal is greater than 4.9 volts, for greater than 3 seconds.
Action Taken When the DTC Sets
DTCs P0100, P0102, and P0103 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0100, P0102, and P0103 are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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 (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine running for 1 minute, verify the MAF sensor scan tool parameter is between 1.5-5.0 g/s.
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 MAF sensor.
2. Ignition OFF, test for less than 10 ohm between the low reference circuit terminal 4 and ground G104.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM.
3. Ignition ON, test for B+ between the ignition voltage circuit terminal 3 and ground.
• If less than the specified range, test the ignition 1 voltage circuit for open/high resistance.
4. Verify the scan tool MAF sensor parameter is less than 0.5 g/s.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
5. Connect a test lamp between the ignition voltage circuit terminal 3 and the signal circuit terminal 5. Verify the MAF sensor parameter is greater than 220 g/s.
• 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 PCM.
6. If all circuits test normal, test or replace the MAF sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the MAF sensor.
2. Install jumper wires between the MAF sensor and the appropriate harness connector terminals.
3. Ignition ON, test for voltage between the MAF sensor signal circuit and ground while blowing air through the MAF sensor.
• If the MAF signal voltage does not increase with air flow, replace the MAF sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for control module replacement, setup, and programming