SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 50

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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

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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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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