SsangYong Korando II (1996-2006 year). Manual — part 119
1F2 -- 56 M161 ENGINE CONTROLS
DAEWOO MY_2000
INDUCTION SYSTEM
THROTTLE VALVE ACTUATOR
YAA1F540
The throttle actuator is actuated by the Engine Control Module (ECM) according to the position of the accelerator pedal
position.
It has two potentiometers which signal the position of the throttle valve to the ECM to enable it to recognize the various
engine load states.
Ignition “Off”
In the de--energized states the throttle valve position is determined to be spring capsule.
Ignition “On”
When the ignition S/W on the servo motor in the throttle actuator is operated by the ECM. The throttle valve adopts a
position in line with the coolant temperature.
Closed position
In the closed throttle position, the servo motor controls engine speed by operating the throttle valve further (greater
mixture) or closing it further (reduced mixture), depending on coolant temperature and engine load. When this is done,
the throttle valve can be closed further by the servo motor overcoming the force of the spring capsule (mechanical end
stop). If the actuator is de--energized, the throttle valve is resting against the spring capsule.
Consequently, the throttle valve opening is a constant 10--12° approximately.
At no load, this produces an engine speed of about 1,800 rpm
Driving
When driving (part/full throttle), the servo motor controls the throttle valve in line with the various load states and ac-
cording to the input signals from the pedal value sensor according to the input signals from the pedal value sensor
according to the position of the accelerator pedal.
The function of the EA (electronic accelerator) in the ECM determines the opening angle of the throttle valve through
the throttle actuator. Further functions are;
D
Idle speed control
D
Cruise control
D
Reducing engine torque for ASR/ABS operation
D
Electronic accelerator emergency running
D
Storing faults
D
Data transfer through CAN
M161 ENGINE CONTROLS 1F2 -- 57
DAEWOO MY_2000
KAB1F240
Failure
Code
Description
Trouble Area
Maintenance Hint
104
Throttle position sensor
1 low voltage
TPS 1 short circuit to ground
or open
105
Throttle position sensor
1 high voltage
TPS 1 short circuit to power
108
Throttle position sensor
2 low voltage
TPS 2 short circuit to ground
or open
109
Throttle position sensor
2 high voltage
TPS 2 short circuit to power
D
Monitoring the actual values through
scan tool
116
Throttle actuator
learning control failure
When actuator adaption
fluctuation or not meet the
condition
scan tool
D
Inspection the ECM pin 84, 85, 87,
112, 67, 68 about short circuit or open
with bad contact
119
Throttle valve return
spring failure
When return spring defective
of actuator
with bad contact
D
Inspection the throttle valve actuator
D
Inspection the ECM
121
Throttle actuator failure
When supply voltage of the
actuator short circuit to power
Inspection the ECM
123
Different mass air flow
sensor signal with
throttle position sensor
When shut down of output
driver
125
Both throttle position
sensor failure
When defective of both
potentiometers
1F2 -- 58 M161 ENGINE CONTROLS
DAEWOO MY_2000
Failure
Code
Description
Trouble Area
Maintenance Hint
126
Throttle position sensor
1 not plausible with
Throttle position sensor
2
When difference between
TPS 1 and TPS 2
D
Monitoring the actual values through
scan tool
D
Inspection the ECM pin 84, 85, 87,
127
High permanent throttle
signal
When failure of wiring
harness or actuator
D
Inspection the ECM pin 84, 85, 87,
112, 67, 68 about short circuit or open
with bad contact
I
ti
th th ttl
l
t t
185
Mass air flow sensor
and throttle position
sensor failure
When difference between
MAF and TPS signal
D
Inspection the throttle valve actuator
D
Inspection the ECM
Circuit Description
The ECM supplies a 5 volt reference signal and a ground to the TP sensor. The TP sensor sends a voltage signal back
to the ECM relative to the throttle plate opening. The voltage signal will vary from approximately 0.3 ~ 0.9 volts at
closed throttle, to over 4.0 ~ 4.6 volts at Wide Open Throttle (WOT).
The TP sensors serve for engine load control according to the drive pedal command. Load adjustments independent of
the drive pedal command can be implemented; such functions are, for instance, idle control, speed control, drive slip
control, load shock damping, and similar functions.
When the actuator current fails, the throttle valve is returned to emergency operating position by a spring. The throttle
valve position, thereby the actuator drive position checkback is provided by two potentiometers. The motor positions
the throttle valve against the return spring force. Motor and return spring are two separate energy sources. Each of
them is able to position the throttle valve in emergency position alone. Throttle valve position checkback and monitor-
ing is provided by two actual value potentiometers connected to the engine control electronics.
Throttle Actuator Inspection
1. Turn the ignition switch to “ON” position.
2. Measure the TPS 1 signal voltage at the ECM pin No. 87 and TPS 2 signal voltage at the ECM pin No. 85.
Pedal Position
Specified Value
TPS 1
Closed
0.3 ~ 0.9 v
TPS 1
Opened
4.0 ~ 4.6 v
TPS 2
Closed
4.0 ~ 4.6 v
TPS 2
Opened
0.3 ~ 0.9 v
Throttle Actuator DC Motor Inspection
1. Turn the ignition switch to “ON” position.
2. Measure the signal voltage between the ECM pin No. 67 and No. 68.
Application
Specified Value
Ignition “ON”
0.8 ~ 2.3 v
Engine Status
Idling
1.0 ~ 2.5 v
(Coolant temperature is over 70°C)
Throttle Actuator DC Motor Resistance
1. Turn the ignition switch to “OFF” position.
2. Measure the resistance between the ECM pin No. 67 and No. 68.
Specified Value
< 10 Ω
M161 ENGINE CONTROLS 1F2 -- 59
DAEWOO MY_2000
BLANK
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