Code Definition
- DTC P0102: Mass Or Volume Airflow Circuit Low Input
- DTC P0103: Mass Or Volume Airflow Circuit High Input
Note. Before performing any diagnostic test, refer to WARNINGS, CAUTIONS and NOTES in DIAGNOSTIC TESTS .
Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
Diagnostic Aids
Engine Control Module (ECM) continuously monitors input from Mass Air Flow (MAF) sensor. ECM will set malfunction code if input is more or less than range of expected values for current engine operating conditions. Check for following possible problems
- Open or short to ground between MAF sensor and ECM.
- Open or short to ground between MAF sensor battery power and Main relay.
- Short to battery between MAF sensor signal and ECM.
- Faulty MAF sensor.