General Precautions of EFI System Maintenance
F-18
18. P0102 Air Flow Meter Sensor Voltage Too Low
Description about Malfunction Cause:
The signal of air flow meter sensor is obtained by the transformation of temperature difference signal to
voltage signal. After the start of engine, if the continuously checked voltage signal of air flow meter sensor is
below the threshold value, low voltage failure is determined by the system.
Schematic Circuit:
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0102
P0102
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Short circuit between Pin 37# and Pin 17# of
ECU.
2) Circuit connected to Pin 37# of ECU short
circuited to ground.
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system to fulfill diagnosis.。
1) Measure the electric resistance of the circuit
between the Pin 37# of ECU and the Pin 17# of
ECU.
2) Measure the electric resistance of circuit
between Pin 37# of ECU and ground.
Main relay
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