Airflows In Idle Speed Actuators - PGO Tigra AF-125BAE Service Manual

Fuel Injection System 7
Principle:
The idle sped actuator is composed of electromagnetic coils, armature iron, and valve. The airflow passing the
idle speed actuator is relevant to both the duty factor of pulse exported to the idle speed actuator by ECU and
the pressure difference between the inlet and the outlet of the idle speed actuator. The idle speed actuator is
disabled during no supply of electrical pulse.
In the case of a duty factor of 100% (full open), the airflow passing two types of idle speed actuators will be
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different. As shown in figures below, the airflow is 3.0m /h and 6.5 m /h while detected in the idle speed
actuator TEV2 (full open; pressure difference: 200mbar) and TEV5 (full open; pressure difference: 700mbar).
Fig. 2-31, Airflows in idle speed actuators (Left: TEV2; right: TEV5)
Airflow direction
Fault diagnosis
ECU is effective in diagnosing both the idle speed actuator and the driving system. In the event of a short
circuit (or overload) between the idle speed actuator's driving system and the battery or a short (open) circuit
between the idle speed actuator's driving system and GND, the close loop control for dispensing fuel and the
idle air volume learning are terminated but the latest self-learning data is employed.
Notices for maintenance:
Root causes of general troubles: Rustiness or airtight characteristic deteriorated due to any foreign object in the
valve.
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