P0103

CIRCUIT DESCRIPTION

Schematic:

The Mass Air Flow (MAF) sensor is an air flow meter that measures the flow rate and density of the air entering the engine. The MAF sensor receives power and ground from circuits not supplied by the control module. The control module applies a voltage to the sensor on the signal circuit. The sensor uses the voltage to produce a frequency based on inlet air flow through the sensor. A low air flow rate (such as engine idle) causes the MAF sensor to produce a low frequency signal. A high air flow rate (such as wide open throttle, or high load) causes the MAF sensor to produce a high frequency signal.

The PCM uses the MAF sensor signal to provide the correct fuel delivery for a wide range of engine speeds and loads. If the PCM detects a signal frequency higher than the possible range of a normally operating MAF sensor, DTC P0103 will set.

CONDITIONS FOR SETTING THE DTC
^ No TP sensor, MAP sensor, or system voltage DTCs are set
^ Engine speed is more than 400 rpm.
^ System voltage is more than 10.5 volts.

CONDITIONS FOR RUNNING THE DTC
^ The MAF sensor signal is more than 11,000 Hz.
^ The condition exists for at least 3 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
For intermittent conditions, refer to Symptoms. Symptom Related Diagnostic Procedures

TEST DESCRIPTION

Steps 1 - 7:

The numbers below refer to the step numbers on the diagnostic table.
6. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.