DTC 19: Throttle Position Sensor/Mass Airflow Sensor Calibration
Ensure Idle Air Control Valve (IACV) and overrun fuel cutoff operate with the throttle closed. Check throttle position sensor. Check voltage at mass airflow sensor pin No. 1 or 2 (zero volts) and pin No. 5 (12 volts). Check mass airflow sensor output voltage. For adjustment procedures, see ADJUSTMENTS article. Repair or replace as necessary.