On-Vehicle Inspection of
FUEL SYSTEM
VALVE>
Components
OPERATION
The throttle position sensor converts the throttle
position opening into a voltage and inputs it to the
engine control module, which
fuel injection, based on the input signal.
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The
power in the engine control module is
supplied to the throttle position sensor. It flows
through the resistor in the sensor and is then
grounded in the engine control module.
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As the throttle valve shaft rotates from the idle
position to wide open position, the resistance
between the variable resistor terminal of the
throttle position sensor and the ground terminal
increases. As a result, the voltage at the throttle
position sensor variable resistance terminal also
increases.
INSPECTION
Using Scan Tool
TROUBLESHOOTING HINTS
Hint 1: The throttle position sensor signal is more
important in the control of automatic trans-
axle than in the engine control. Shifting
shock and other troubles will be caused if
this sensor is faulty.
Hint 2:
If the output voltage of the throttle position
sensor is out of specification, adjust the
sensor and check the voltage again.
If there is an evidence of disturbed fixed SAS
setting, adjust the fixed SAS.
Function
item No.
Data display
Check
condition
Throttle valve
Standard value
Data
14
Sensor
switch:
ON
At idle position
300
reading
voltage
Open slowly
Increases with valve
opening
Open widely
4,500 5,500
HARNESS INSPECTION
Harness
connector
Check
for
continuity of the ground
circuit.
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Throttle position sensor connector:
Disconnected
Repair the
harness.
Harness
side
ECM
harness side
connector
Check for an open-circuit, or a short-
circuit to ground between the engine
control module and the throttle
tion sensor.
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Throttle position sensor connector:
Disconnected
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Engine control module
tor:
Disconnected
Repair the
harness.
TSB Revision
Summary of Contents for 1989 Galant
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