SsangYong Stavic / SsangYong Rodius (2005 year). Manual — part 50
1F-41
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AFFECTED VIN
ENGINE CONTROLS
M162 GSL ENG SM - 2005.7
Failur Code
Description
Trouble Area
Maintenance Hint
• Monitoring the actual values
through
• 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
Throttle position sensor
1 low voltage
TPS 1 short circuit to ground or
open
104
Throttle position sensor
1 high voltage
TPS 1 short circuit to power
105
Throttle position sensor
2 low voltage
TPS 2 short circuit to ground or
open
108
Throttle position sensor
2 high voltage
TPS 2 short circuit to power
109
Throttle actuator
learning control failure
When actuator adaption fluctua-
tion or not meet the condition
scan tool
116
Throttle valve return
spring failure
When return spring defective of
actuator with bad contact
119
Throttle actuator failure
When supply voltage of the
actuator short circuit to power
Inspection the ECM
121
Different mass air flow
sensor signal with
throttle position sensor
When shut down of output driver
123
Both throttle position
sensor failure
When defective of both potenti-
ometers
125
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ENGINE CONTROLS
M162 GSL ENG SM - 2005.7
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 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.
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
Closed
Opened
Closed
Opened
TPS 1
TPS 2
Specified Value
0.3 ~ 0.9V
1 4.0 ~ 4.6V
4.0 ~ 4.6V
0.3 ~ 0.9V
Ignition “ON”
Idling
Engine
status
Specified Value
0.8 ~ 2.3 v
1.0 ~ 2.5 v
(Coolant tempera-
ture is over 70 °C)
Application
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
Failur Code
Description
Trouble Area
Maintenance Hint
• 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
Mass air flow sensor
and throttle position
sensor failure
When difference between MAF
and TPS signal
185
High permanent throttle
signal
When failure of wiring harness or
actuator
127
Throttle position sensor
1 not plausible with
Throttle position sensor 2
When difference between TPS 1
and TPS 2
126
1F-43
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ENGINE CONTROLS
M162 GSL ENG SM - 2005.7
HOT FILM AIR MASS (HFM) SENSOR
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 incom-
ing 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
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ENGINE CONTROLS
M162 GSL ENG SM - 2005.7
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)
R min.(
Ω
Ω
Ω
Ω
Ω)
R nom. (
Ω
Ω
Ω
Ω
Ω)
R max. (
Ω
Ω
Ω
Ω
Ω)
-40
-20
0
20
40
60
80
100
120
130
35,140
12,660
5,119
2,290
1,096
565
312
184
114
91
39,260
13,850
5,499
2,420
1,166
609
340
202
127
102
43,760
15,120
5,829
2,551
1,238
654
370
222
141
114
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