DTC P0102 (QA_Low): Mass Airflow (MAF) Sensor Circuit Low Input

Turn ignition off. Connect SSM. Start engine. Set SSM to function mode F06 to display mass air flow and voltage signal values from MAF sensor. If values are between 1.3 g/sec and 250 g/sec or .3-5.0 volts, system is normal. Check for poor connections or intermittent open circuits. If air flow is not in specifications, go to next step.
Turn ignition on, with engine off. Using DVOM connected to chassis ground, backprobe ECM connector terminal No. 5. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage reading is less than .3 volts, go to next step. If voltage reading is more than .3 volts, wiggle ECM connector. If voltage reading changes to less than .3 volts, check for poor or faulty ECM connector terminals or circuit. If terminals and circuit are okay, replace ECM with known good component and retest.
Turn ignition off. Disconnect MAF sensor. Turn ignition on. Check voltage at MAF connector terminal No. 1. If voltage reading is more than 10 volts, go to next step. If voltage reading is 10 volts or less, repair open circuit between ECM and MAF sensor.
Turn ignition off. Disconnect ECM. Check resistance between ECM connector terminal No. 5 and MAF connector terminal No. 4. If resistance is less than 1 ohm, go to next step. If resistance is 1 ohm or more, repair open wiring or poor connection.
Check resistance between ECM connector terminal No. 53 and MAF connector terminal No. 3. If resistance is less than 1 ohm, go to next step. If resistance is 1 ohm or more, repair open wiring or poor connection.
Check resistance between MAF connector terminal No. 5 and ground. If resistance is more than 1 megohm, replace MAF sensor. If resistance is 1 megohm or less, repair short in wiring.