Geely Emgrand X7. Manual part — 93

8

Use the active test function to inspect the voltage between the canister solenoid valve
terminals.

(a) Turn off the ignition switch.

(b) Disconnect

canister solenoid valve wiring harness connector.

(c) Test Lamp Connection

(d) In the engine active test, connect the scan tool and drive the canister solenoid valve.

Is the test lamp lit?

9 Replace

ECM

(a) Replace ECM and refer to 2.2.8.1 "Replacement of Engine Control Module".

(b) Carry out the crankshaft position sensor learning, refer to 2.2.7.11 “Crankshaft Position

Sensor (CKP) Learning.

Is canister solenoid valve working properly?

10

Replace the canister solenoid valve.

(a) Turn off the ignition switch.

(b) Refer to “2.4.6.3 Replacement of Canister Solenoid Valve” to replace the canister solenoid

valve.

Confirm the repair has been completed.

11

The system is normal.

Next

Yes

The system is normal.

No

Yes

The system is normal.

No

Yes

The system is normal.

No

371

2.4.6.4 Positive Crankcase Ventilation (PCV) System Inspection / Diagnostic

1

Inspect whether there is vacuum in crankcase ventilation hose. vacuum should be

present in the Hose. If not, inspect whether the hose is blocked, leaking or ventilation tube

connector blocked.

2

With the engine running, plug the end of the vacuum hose. When the hose end plugged,

inspect whether there is collapse in all parts of the hose. If hose collapses, the hose should

be replaced.

3

If engine oil is gathered into the intake pipe, inspect whether there is the following

situations:

A. Crankcase vacuum hole blocked.
B. Crankcase ventilation hood blocked.
C. Crankcase pressure or channeling gas beyond the acceptable tolerance range.

4

Inspect other items:

A. Fresh air ventilation or vent hose assembly connector blocked or leaking.
B. Throttle body channel blocked.
C. O-ring missing or damaged.
D. Inspect cylinder head covers, oil pan gasket and other sealing parts for leaking.

The consequences of not working correctly

If the crankcase ventilation hose is blocked, it will cause the following faults:
idle instable.
Engine stalls or idle speed is too low.
Engine oil leaked.
Engine oil enters the intake.
Engine has sludge.
Ventilation hood or hose leakage may lead to the following faults:

5

Finish

Next

Next

Next

Next

372

Unstable idling speed
Engine stops unexpectedly

2.4.6 Removal and installation

2.4.6.1 Replacement of Rear Oxygen Sensor

Dismantlement Procedure

Warning: Refer to "Warning on Maintenance of Exhaust System", and "Warning on Vehicle
Lifting and Jacking" in "Warnings and Precautions".

1. Disconnect the battery negative

cable. Refer to 2.12.6.1 Battery
Cable Disconnection/Connection
Procedures.

2. Disconnect the rear oxygen

sensor harness connector.

NL02-0069b

3. Lifting and Jacking the Vehicle

4. Dismantle the heated type rear

oxygen sensor.

NL02-0070b

Installation Procedure:

1. Install the rear oxygen sensor.

2. Lower

the

vehicle.

3. Connect the rear oxygen sensor

harness connector.

4. Connect the battery negative

cable .

NL02-0071b

2.4.6.2 Replacement of Front Oxygen Sensor

373

Dismantlement Procedure

Warning: Refer to "Warning on Exhaust System Maintenance" in "Warning and
Precautions".

1. Disconnect the battery negative

cable. Refer to 2.12.6.1 Battery
Cable Disconnection/Connection
Procedures.

2. Disconnect the front oxygen

sensor harness connector.

NL02-0072b

3. Dismantle the heated type front

oxygen sensor.

NL02-0073b

Installation Procedure:

1. Install the heated type front

oxygen sensor.

2. Tighten heated oxygen sensor.

3. Connect the front oxygen sensor

wiring harness connector.

4. Connect the battery negative

cable .

NL02-0074b

374