Рет қаралды 804
#hocdienchancoban #hocdienoto #technical #diagnosis
The TPS is mounted on the throttle body and converts the throttle valve
angle into an electrical signal. As the throttle opens, the signal voltage
increases.
The ECM uses throttle valve position information to know:
• engine mode: idle, part throttle, wide open throttle.
• when to switch off AC and emission controls at Wide Open Throttle (WOT).
• air-fuel ratio correction.
• power increase correction.
• fuel cut control.
The basic TPS requires three wires. Five volts are supplied to the TPS
from the VC terminal of the ECM. The TPS voltage signal is supplied to
the VTA terminal. A ground wire from the TPS to the E2 terminal of the
ECM completes the circuit.
At idle, voltage is approximately 0.6 - 0.9 volts on the signal wire. From
this voltage, the ECM knows the throttle plate is closed. At wide open
throttle, signal voltage is approximately 3.5 - 4.7 volts.
Inside the TPS is a resistor and a wiper arm. The arm is always
contacting the resistor. At the point of contact, the available voltage is
the signal voltage and this indicates throttle valve position. At idle, the
resistance between the VC (or VCC) terminal and VTA terminal is high,
therefore, the available voltage is approximately 0.6 - 0.9 volts. As the
contact arm moves closer the VC terminal (the 5 volt power voltage),
resistance decreases and the voltage signal increases.
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