Chery Tiggo 5 (T21). Service manual - part 135

09–

GENERAL INFORMATION

Description

Emission control system recovers and burns fuel vapor to prevent the vapor in fuel tank from being
discharged into the atmosphere. It monitors the oxygen content in exhaust gas, so as to guarantee the
maximum efficiency of catalyst assembly in converting the HC, CO and NOx in exhaust gas.
Activated charcoal canister assembly plays an important role in the emission control system. The activated
charcoal canister assembly can be used to absorb and filter moisture and fuel vapor. Fresh air enters the
bottom of activated charcoal canister assembly while fuel vapor enters the top of activated charcoal canister
through pipe. When engine stops operating, the fuel vapor and fresh air will be stored in the activated
charcoal canister assembly. When canister solenoid valve opens, the fuel vapor will enter intake manifold to
burn.

1 - Fuel Tank Assembly

2 - Activated Charcoal Canister Solenoid Valve

3 - PCV Valve

4 - Activated Charcoal Canister Assembly

RT21090010

MAX

MIN

09–

Oxygen sensor consists of upstream oxygen sensor and downstream oxygen sensor. Upstream oxygen
sensor is installed on the upper part of precatalytic converter assembly, and downstream oxygen sensor is
installed on the lower part of precatalytic converter assembly. The oxygen sensor can detect the oxygen
content in exhaust gas, and determine whether combustible air-fuel mixture is completely burnt out or not, so
as to guarantee the maximum efficiency of catalyst assembly in converting the HC, CO and NOx in exhaust
gas.

Specifications

Torque Specifications

Tool

General Tool

Description

Torque (N·m)

Activated Charcoal Canister Solenoid Valve Bracket
Fixing Bolt

7 ± 1

Coupling Bolt Between Activated Charcoal Canister
Assembly and Body

7 ± 1

Exhaust Manifold Heat Insulator Fixing Bolt

23 ± 2

Upstream Oxygen Sensor

40 - 60

Downstream Oxygen Sensor

40 - 60

Digital Multimeter

RCH0000002

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