P0103

Wiring Diagram:

MAF Sensor Circuit High Voltage:

P0103- MAF SENSOR CIRCUIT HIGH VOLTAGE
The mass airflow (MAF) sensor measures the speed and density of air entering the intake manifold. The ECM converts this input to a mass of air per unit time to correctly fuel the engine. The MAF output voltage is a function of the power required to keep the sensing element at a fixed temperature above outside air temperature as the incoming air cools the sensing elements. The output voltage varies between 0.14 and 4.8 volts under all normal engine running conditions. DTC P0103 sets when the MAF sensor signal voltage at the ECM is above the calibrated voltage value.

DTC PARAMETERS
DTC P0103 will set if MAF sensor signal voltage is greater than 4.8 volts when:
^ Engine run time is longer than 0.3 seconds
^ Battery voltage is greater than 11.0 volts
^ No TP sensor DTCs have been set

DTC P0103 diagnostic runs continuously once the above conditions have been met.

P0103 is a type B DTC

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to monitor MAF SENSOR with ignition On, engine Off. Wiggling wires while watching for a change in MAF SENSOR voltage may locate the area where a short to voltage in the wiring could lie.

If the ECM loses the MAF sensor signal. it will calculate airflow based on MAP, engine speed and TP sensors.

Circuits 416 (CMP/EGR/MAF/MAP sensor), circuit 2709 (AC pressure/fuel tank pressure sensor) and circuit 1164 (APP sensor 1) share the same 5 volt reference supply (5 volt Ref-A).

The CMP/ECT/IAT/EGR/MAF/MAP/TP1/TP2 sensors share the same sensor return circuit 652. IMPORTANT: A direct short to voltage on circuit 652 may cause internal damage to the ECM ground trace, or open the sensor element in the ECT, IAT, and/or MAP sensor.