SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 54

1F-57

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROLS

M162 GSL ENG SM - 2005.7

RESONANCE FLAP

Circuit Description

A pneumatically actuated resonance flap is located on the intake manifold, and will be opened and closed by load, which
operates resonance flap according to engine and controlled by ECM and rpm.

Resonance flap is closed at idle/partial load (less than 3,800/rpm). The switch valve will be adjusted by ECM and
resonance flap will be closed. By increasing air flow passage through dividing intake air flow toward both air collection
housing. This leads to a significant increase in the torque in the lower speed range.

Resonance flap is open at full load (over 3,800/rpm). The switch valve will not be adjusted by ECM and resonance flap will
be open. The collected air in the air collection housing will not be divided and intake air passage will be shorten.

Failur Code

Description

Trouble Area

Maintenance Hint

• Monitoring the actual operational

status and vehicle speed signal
through scan tool

• Inspection the Engine Control

Module (ECM) pin 97 about short
circuit or open with bad contact

• Inspection the power source short

circuit or open to resonance flap

• Inspection the resonance flap

solenoid and hardware

• Inspection the ECM

Resonance flap short

circuit to battery

Resonance flap short circuit to

power

228

Resonance flap short

circuit to ground or

open

Resonance flap short circuit to

ground or open

229

1F-58

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROLS

M162 GSL ENG SM - 2005.7

STOP LAMP SWITCH

Failur Code

Description

Trouble Area

Maintenance Hint

• Monitoring the actual operational

status and vehicle speed signal
through scan tool

• Inspection the Engine Control

Module (ECM) pin 49 about short
circuit or open with bad contact

• Inspection the contact condition of

stop lamp switch

• Inspection the ECM

Stop lamp switch failure

When malfunction of stop lamp

switch - implausible condition of

stop lamp signal input

135

Circuit Description

The stop lamp switch is normally opened. When the ignition switch ON and brake ON, the battery voltage is supplied to
the ECM. A scan tool should display ON when brake pedal is depressed and should read OFF with brake pedal released.

1F-60

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROLS

M162 GSL ENG SM - 2005.7

CATALYTIC CONVERTER

The purpose of the catalytic converter is to convert the
three pollutants of carbon monoxide(CO), hydrocarbons
(HC) and oxides of nitrogen (NOx) contained in the ex-
haust of gasoline engines, into the harmless compounds
of water (H2O), carbon dioxide (CO2) and nitrogen (N2).

The catalytic converter contains a catalyst, a word com-
ing from the Greek and which designates the element
essential for catalyst which triggers chemical reactions
without itself being consumed.

These catalysts in the 3-way catalytic converter are the
rare metals platinum (Pt) and rhodium (Rh).

The catalytic converter consists essentially of three main
elements. The exhaust gases flow through the catalytic
converter and, in so doing, coming into contact with rare
metals (Pt and Rh).

The following chemical reaction are produced.

CO + O

2

→ CO

2

HC + O

2

→ CO

2

 + H

2

O

NO

x

→ N

2

 

+ O

2

EXHAUST SYSTEM

1F-61

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROLS

M162 GSL ENG SM - 2005.7

OXYGEN SENSOR

The oxygen sensor is unique among the engine control
sensors because is acts like a battery and is able to
generate its own low voltage signal. It is located the ex-
haust system and monitors the amount of oxygen in the
exhaust stream and provides feedback to the Engine
Control Module (ECM).

The electrically heated oxygen sensor warms up quickly
and remains hot, even at idle when the exhaust manifold
may cool down.

The ECM applies a reference voltage of 450 mv to the
oxygen sensor, the ECM compares this reference volt-
age with the voltage generated by oxygen sensor. The
amount of voltage the oxygen sensor generates is pro-
portionate to the difference between the amount of oxy-
gen in the outside air and the exhaust gases. The atmo-
sphere contains about 21% oxygen. The exhaust from a
rich air/fuel ratio contains almost no oxygen. With a large
difference between the amounts of oxygen containing the
two surface, the sensor generates less voltage.

When the exhaust gas is rich (below 14.7 : 1), the voltage
output is high, above 450 mv. When the exhaust gas is
lean (above 14.7 : 1 air/fuel ratio), the sensor’s voltage
output is low, below 450 mv.

The ECM uses oxygen sensor information for:

• Open loop / closed loop criteria

• Ideal air / fuel ratio