Geely Diagnosis Flow. Manual part — 28

109

No.061 Quick diagnosis for canister solenoid valve

Function: for controlling flow of regenerated air flow of fuel evaporation control system.
Principle: canister of fuel evaporation control system could absorb oil vapor of oil tank, till
saturation. After canister control valve by electronic controller is opened, fresh air and fuel vapor
saturated in the canister will form regenerated air flow, and reintroduce to engine inlet pipe. And
electronic controller will change duty ratio of impulse signal transferred to magnet coil of canister
control valve according to engine’s different conditions, thus controlling over flow of regenerated
air flow. In addition, this flow is affected by pressure difference at two s ides.

Definitino of TEV pin:
1# TEV driver stage pin;
2#5# TEV control pin;
Maintenance precautions:
1. When installing, airflow direction shall conform to specifications; 2. In case control valve
becomes invalid due to black particle within valve body, and needed to be replaced, check
canister; 3. During maintenance, avoid liquid such as water, oil from entering to valve; 4. To
avoid transfer of solid borne noise, recommend to hang up canister control valve and install it at
hose.
Simple measuring method:
1. (remove the connector) place digital multimeter to ohm position, and two pens are respectively
connected to two pins of canister control valve; rated resistance is 26Ω under 20 ;

℃

2. Remove canister control valve, and absorb the air inside and check; canister control valve
shall be stuffy; then apply battery voltage of 12V to two connecting terminals, and absorb the air
to control valve, and the valve shall be airing. If upon check, status of canister control valve is not
consistent with above check results, it indicates that it is malfunction, and replace it;

110

Diagnosis flowchart for canister control valve

1. Ignition switch closed: remove joint of canister control valve, and turn on

ignition switch, but unable to start the engine. Measure there is 12V voltage

to ground at one terminal of socket connector?

2. Check lines between main relay terminal 87 and canister control valve are

open circuited, shorted to ground or to power source?

3. Check resistance of canister control valve is 5-50Ω?

4. Ignition switch closed: remove ECU joint: check lines between ECU and

canister control valve are open circuited, shorted to ground or to power

source?

5. Replace canister control valve

6. Replace ECU, and confirm repairs are completed.

Repairs

Repairs

Y

Y

Y

Y

N

N

N

N

Y

111

No.062 Fuel injector EV

• Function: fuel injector ejects fuel within specified time according to instructions of ECU, and
provides fuel to the engine and make it atomized.

• Principle: ECU supplies power to coil of fuel injector, forming magnetic field force; when this
force increases enough to overcome resultant of pressure of release spring, gravity of needle
valve and friction force, needle valve starts to rise, and fuel injection starts. When injection
impulse stops, pressure of release spring will make needle valve re-closed.
• Mounting position: Intake manifold close to inlet valve.

Malfunction: Poor idling speed, poor acceleration, unable to startup (difficult startup), etc.
General causes: Colloid deposit within fuel injector due to lack of maintenance, causing it
ineffective.
Maintenance precautions: 1. There are many types of fuel injectors, and those with the same
appearance and which could be installed may not be the proper one. Part number for injector
during repairs must be the same with that of original injector. Do not mix up; 2. To ensure
convenient installation, apply clean silicon-free oil at surface of upper O ring connected with fuel
distribution pipe. Do not pollute inner of oil injector and jet orifice; 3. When removing and
reassembling fuel injector, replace O ring; do not damage sealing surface of fuel injector; 4. If
fuel injector has two slots, make it correct when installing clamps by referencing mounting
position of original parts; 5. Do not remove, and clean or replace filter screen without permission;
6. After removing, make sure fuel injector seat is clean. Avoid foreign substances entering to the
cylinder.

1. O

ring

2. Filter

screen

3. Ejector body with electric

plug

4. Coil

5. Spring

6. Valve needle with coil

112

Simple measuring method:
(remove the connector) Place digital multimeter to ohm position, and two pens are respectively
connected to two pins of oil injector, and rated resistance is 11-17Ω under 20 .

℃

Suggestions: thoroughly clean oil injector with special cleaning analyzer for each 20000kM.
Diagnosis flowchart for oil injector

1. Close ignition switch and disconnect joint of oil ejector; connect voltmeter
to No. 1 terminal of the first cylinder ejector and earth between; switch on
ignition switch, and observe voltage of No. 1 terminal of oil ejector is 12V
instantaneously? For other oil ejectors, same steps.

2. Repair earthing, short circuit and open circuit between main relay, oil

pump relay, oil ejector

3. Check lines between oil ejector and ECU terminal (17-2) are open
circuited, shorted to ground or to power source?

4. Close ignition switch, and remove joint of oil ejector: measure resistance
of each oil ejector is lower than 15.95Ω one by one with ohmmeter?

5. Connect oil ejector joint of each cylinder and ground with ohmmeter;
measure resistance between each oil ejector and ground is larger than
1MΩ?

6. Replace oil ejector

7. Replace ECU

Completed

Repairs

Y

Y

Y

Y

N

N

N

N

Y