SsangYong Rexton. Manual — part 408
SSANGYONG Y200
1F1-48 M162 ENGINE CONTROLS
TPS 1
TPS 2
Pedal Position
Closed
Opened
Closed
Opened
Failure
Code
Description
Trouble Area
Maintenance Hint
Throttle position sensor
1 not plausible with
Throttle position sensor
2
High permanent throttle
signal
Mass air flow sensor
and throttle position
sensor failure
When difference between TPS
1 and TPS 2
When failure of wiring harness
or actuator
When difference between MAF
and TPS signal
•
Monitoring the actual values through
scan tool
•
Inspection the ECM pin 84, 85, 87, 112,
67, 68 about short circuit or open with
bad contact
•
Inspection the throttle valve actuator
•
Inspection the ECM
126
127
185
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 check back 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
check back and monitoring 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.
Specified Value
0.3 ~ 0.9 v
1 4.0 ~ 4.6 v
4.0 ~ 4.6 v
0.3 ~ 0.9 v
Application
Specified Value
0.8 ~ 2.3 v
1.0 ~ 2.5 v
(Coolant temperature
is over 70 °C)
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.
Engine
Status
Ignition “ON”
Idling
Specified Value
<10
Ω
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.
SSANGYONG Y200
1F1-50 M162 ENGINE CONTROLS
HOT FILM AIR MASS (HFM) SENSOR
YAD1F430
The Hot Film Air Mass (HFM) sensor with recognition of flow direction related to pulsating flow is designed for
recording load on Engine Control Module (ECM) by measuring the output voltage proportional to the reference
voltage of the ECM.
Mass Air Flow Sensor
Mass Air Flow (MAF) is a thermal flow meter whose sensor element with its temperature sensors and heating area
is exposed to the MAF to be measured. A heating area located in the center of a thin membrane is controlled to
an over-temperature by a heating resistor and a temperature sensor of this membrane. And the value of over-
temperature depends on the temperature of the in-flowing air.
Two temperature sensors on upstream and downstream of the heating area show the same temperature without
incoming flow. With incoming flow, upstream part is cooled down but downstream temperature retains its temperature
more or less due to the air heated up in the heating area. This temperature difference in quantity and direction
depends on the direction of the incoming flow.
ECM modulates the flow of heating current to maintain the temperature differential between the heated film and
the intake air at a constant level. The amount of heating current required to maintain the temperature thus provides
an index for the MAF. This concept automatically compensates for variations in air density, as this is one of the
factors that determines the amount of warmth that the surrounding air absorbs from the heated element. MAF
sensor is located between the air filter and the throttle valve.
1 Housing
2 Protector Net
3 Electronic Housing
4 Connector
5 Hot Film Air Mass Sensor
6 Measuring Port
M162 ENGINE CONTROLS 1F1-51
SSANGYONG Y200
Under high fuel demands, the MAF sensor reads a high mass flow condition, such as Wide Open Throttle (WOT).
The ECM uses this information to enrich the mixture, thus increasing the fuel injector on-time, to provide the
correct amount of fuel. When decelerating, the mass flow decreases. This mass flow change is sensed by the
MAF sensor and read by the ECM, which then decreases the fuel injector on-time due to the low fuel demand
conditions.
To facilitate the installation of the HFM in the intake passage, lubricating agents may be used. However, when
lubricants are used care must be taken to ensure that they do not enter the flow passage and cannot be sucked
in with the air flow.
The following tables show the relationship between MAF and output voltage.
Intake Air Temperature
The Intake Air Temperature (IAT) sensor is a part of Hot Film Air Mass (HFM) sensor and is a thermistor, a resistor
which changes value based on the temperature of the air entering the engine. Low temperature produces a high
resistance, while high temperature causes a low resistance as the following table.
The ECM provides 5 volts to the IAT sensor through a resistor in the ECM and measures the change in voltage to
determine the IAT. The voltage will be high when the manifold air is cold and low when the air is hot. The ECM
knows the intake IAT by measuring the voltage.
The IAT sensor is also used to control spark timing when the manifold air is cold.
Mass Air Flow (kg/h)
Voltage (V)
Mass Air Flow (kg/h)
Voltage (V)
0
10
15
30
60
120
0.95 ~ 1.05
1.28
1.41
1.71
2.16
2.76
250
370
480
640
800
3.51
3.93
4.23
4.56
4.82
Temp. (°C)
-40
-20
0
20
40
60
80
100
120
130
R min.(
Ω
Ω
Ω
Ω
Ω
)
35140
12660
5119
2290
1096
565
312
184
114
91
R nom. (
Ω
Ω
Ω
Ω
Ω
)
39260
13850
5499
2420
1166
609
340
202
127
102
R max. (
Ω
Ω
Ω
Ω
Ω
)
43760
15120
5829
2551
1238
654
370
222
141
114
SSANGYONG Y200
1F1-52 M162 ENGINE CONTROLS
Intake air temperature
sensor low voltage
Intake air temperature
sensor high voltage
Intake air temperature
sensor plausibility
Mass air flow sensor
plausibility
Mass air flow sensor
low voltage
Mass air flow sensor
high voltage
YAD1F440
Failure
Code
Description
Trouble Area
Maintenance Hint
IAT sensor short circuit to
ground or open
IAT sensor short circuit to
power
Malfunction in recognition of
IAT
When functional problem
Malfunction in recognition of
MAF
When air mass not plausible
MAF sensor short circuit to
ground or open
MAF sensor short circuit to
power
•
Monitoring the actual air temperature
through scan tool
•
Inspection the ECM pin 80, 79 about
short circuit or open with bad contact
•
Inspection the IAT sensor (integrated in
HFM sensor)
•
Inspection the ECM
•
Monitoring the actual air mass flow
through scan tool
•
Inspection the ECM pin 81, 105 about
short circuit or open with bad contact
•
Inspection the MAF sensor (integrated 11
in HFM sensor)
•
Inspection the ECM
03
04
05
09
10
11
Circuit Description
The heated element on the MAF is a platinum film resistor (heater). It is located on a ceramic plate together with
the other elements in the bridge circuit. The temperature sensitive resistor (flow sensor) also included in the
bridge. The separation of heater and flow sensor facilitates design of the control circuitry. Saw cuts are employed
to ensure thermal decoupling between the heating element and the intake air temperature (IAT) sensor. The
complete control circuitry is located on a single layer. The voltage at the heater provides the index for the mass
air flow. The MAF’s electronic circuitry then converts the voltage to a level suitable for processing in the ECM.
This device does not need a burn off process to maintain its measuring precision over an extended period. In
recognition of the fact that most deposits collect on the sensor element’s leading edge, the essential thermal
transfer elements are located downstream on the ceramic layer. The sensor element is also design to ensure that
deposits will not influence the flow pattern around the sensor.
The IAT sensor uses a thermistor to control the signal voltage to the ECM. The ECM supplies 5 volt reference and
a ground to the sensor. When the air is cold, the resistance is high; therefore the IAT signal voltage will be high.
If the intake air is warm, resistance is low; therefore the IAT signal voltage will be low.
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