Geely Emgrand X7. Manual part — 67

2.2.7.39 DTC P0458 P0459

1. DTC

description:

DTC P0458

Canister Control Valve Circuit Short To Low Voltage or Open

DTC P0459

Canister Control Valve Circuit Short To High Voltage

EVAP solenoid valve absorbs fuel vapor from the evaporative emission canister to the intake
manifold. EVAP solenoid valve is controlled by the pulse width modulation (PWM). The circuit
consists of:

● Operating Voltage: Battery voltage passes through ECM controlled main relay terminal No.3

to reach EVAP solenoid harness connector EM25 terminal A.

● ECM control circuit: EVAP solenoid valve wiring harness connector EM25 terminal B is

connected to ECM harness connector EM01 terminal No.64. ECM has an internal driver
circuit to control the solenoid valve ground. Drive circuit is equipped with a feedback circuit
to ECM. ECM monitors the feedback voltage control circuit to determine whether the control
circuit is open, short to ground or short to voltage.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Locations

P0458

Hardware Circuit
Inspection

At idle conditions, when canister
solenoid valve is inoperative, make
canister solenoid valve circuit short to
ground or open, DTC code set.

P0459

Hardware Circuit
Inspection

At idle conditions, when the canister
solenoid valve is inoperative, make
anister solenoid valve circuit short to
power supply, DTC code set.

1. Canister

Solenoid Valve
Circuit

2. Solenoid

Valve

3. ECM

267

3. Circuit

sketch

主继电器ER09

87

30

86

85

EM01

44

EM01

A

B

发

动
机

控
制

模

块

蓄电池

EF40

碳罐电磁阀

CCP(RMW)

64

MPR

EF22

NL02-0056c

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and
analyze the accuracy of the data, as these will help with quick diagnosis.

Step 1

Use fault diagnosis tester for canister solenoid valve active testing.

(a) Connect fault diagnosis tester to the Data Link Connector.

(b) Disconnect the canister solenoid valve to the Canister vacuum tubes.

(c) Start engine and turn on the fault diagnosis tester.

(d) Enter the following menu: Engine/Action Test/Canister Solenoid Valve

(e) Use fault diagnosis tester to enable the use of Canister Control Valve. Place a finger over the

vacuum port solenoid valve and inspect whether there is suction.

Step 2

Measure canister solenoid valve resistance.

Yes

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

No

Main relay ER09

Battery

Canister electromagnetic
valve

Engi

ne

co

ntr

ol mo

dul

e

268

(a) Rotated ignition switch to OFF

position .

(b) Disconnect canister solenoid

valve harness connector EM25.

(c) Measure resistance between the

canister solenoid valve two
terminals.

Rated resistance: 20 (68ºF)11

℃

-22Ω

(d) Connect canister solenoid valve

harness connector EM25.

碳罐电磁阀线束连接器

EM25

A

B

NL02-0057c

Is the value specified value?

Step 3

Measure solenoid valve working power supply.

(a) Rotated ignition switch to OFF position .

(b) Disconnect

canister solenoid valve harness connector EM25.

(c) Rotated ignition switch to ON position .

(d) Measure voltage between canister solenoid valve harness connector EM25 terminal A and a

reliable ground.

Standard Voltage: 11-14V

(e) Connect canister solenoid valve harness connector EM25. Is the value specified value?

Step 4

Inspect canister solenoid valve control circuit.

No

Inspect whether there is an open circuit or a circuit short to ground
between solenoid valve harness connector EM25 terminal No. A and
main relay terminal No.3. Repair the faulty part. Go to step 7

Yes

Yes

Refer to “2.4.7.3 Replacement of Canister Solenoid Valve”
to replace the canister solenoid valve. Go to Step 7.

No

Canister electromagnetic valveharness

connectorEM25

269

(a) Rotated ignition switch to OFF

position .

(b) Disconnect canister solenoid

valve harness connector EM25.

(c)

Disconnect ECM harness
connector EM01.

(d)

Measure resistance between
canister solenoid valve harness
connector EM25 terminal B and
ECM harness connector EM01
terminal No.57. Inspect whether
the circuit is open.

ECM线束连接器

EM01

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58 57 56 55 54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

NL02-0033c

(e) Measure resistance between canister solenoid valve harness connector EM25 terminal B and

a reliable ground. Inspect whether the circuit is short to ground.

(f) Measure voltage between canister solenoid valve harness connector EM25 terminal B and a

reliable ground. Inspect whether the circuit is short to power supply.

Tester Connection

Standard Value

Resistance Between EM25 (B) and EM01 (64)

Less than 1 Ω

Resistance Between EM25 (B) and Ground

10 kΩ or higher

Voltage Between EM25 (B) and Ground

0V

Are the values specified values?

Step 5

Inspect the ECM Power Supply Circuits.

(a) Inspect whether ECM power supply circuit is normal.

(b) Inspect whether ECM ground circuit is normal.

Step 6

Replace ECM

Refer to 2.2.7.11 Crankshaft Position Sensor (CKP) Learn to carry out the crankshaft position
sensor learn after replacing the ECM.

Step 7

Use fault diagnosis tester to confirm if DTC is stored again .

(a) Connect the fault diagnosis tester to the diagnostic interface.

(b) Turn ignition switch to ON position.

No

Repair or replace the wire harness
connector to step 10.

Yes

No

Repair the faulty part.

Yes

ECMharness connectorEM01

270