P0103
DTC P0100, P0102, or P0103
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 (Electrical Diagrams)
Connector End View Reference
* Powertrain Control Module Connector End Views (Powertrain Control Module Connector End Views)
* Engine Controls Connector End Views (Engine Controls Connector End Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
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 5 ohms between the MAF sensor signal low circuit terminal 2 and ground.
• If greater than the specified range, test the signal low circuit for an open/high resistance. If the circuit tests normal, replace the PCM.
3. Ignition ON, test for battery voltage on the ignition 1 voltage circuit terminal 1.
• If less than B+, repair the open/high resistance in the ignition 1 voltage circuit.
4. Verify the MAF sensor scan tool 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 1 voltage circuit terminal 1 and the signal circuit terminal 3. Verify the MAF sensor parameter is greater than 220 g/s.
• If less than the specified range, test the MAF sensor signal high 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 3 jumper wires between the harness connector and the MAF sensor.
3. Ignition ON, measure for voltage on the MAF signal circuit when blowing air thru the MAF sensor.
• If the signal voltage did 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