Geely Emgrand X7. Manual part - 59
Geely Emgrand X7. Manual part - 59
(a) Rotated ignition switch to OFF
position .
(b) Disconnect cylinder No.4 fuel
injector wiring harness connector
EM17.
(c)
Disconnect ECM harness
connector EM01.
(d) Measure resistance between
cylinder No.4 fuel injector wiring
harness connector EM17 terminal
No.A and ECM harness
connector terminal No.66.
Inspect whether the circuit is
open. If there is no open circuit,
repair the faulty part.
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 cylinder No.4 fuel injector wiring harness connector EM17
terminal No.A and a reliable ground. Inspect whether the circuit is short to ground. Otherwise,
repair the faulty part.
(f) Measure voltage between cylinder No.4 fuel injector harness connector EM17 terminal No.A
and a reliable ground. Inspect whether the circuit is short to power supply. Otherwise, repair
the faulty part.
Test Items
Standard Value
Resistance Between EM17 (A) and EM01 (26)
Less than 1 Ω
Resistance Between EM17 (A) and a Reliable Ground
10 kΩ or higher
Voltage Between EM17 (A) and a Reliable Ground
0V
Execute next step as per normal.
Step 7
Inspect the ECM Power Supply Circuits.
(a) Inspect whether ECM power supply circuit is normal.
(b) Inspect whether ECM ground circuit is normal.
Step 8
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.
Next
No
Repair the faulty part.
Yes
Next
ECMharness connectorEM01
235
Step 9
Use a fault diagnosis tester to confirm whether the DTC Code is stored again.
(a) Connect fault diagnosis tester to the diagnostic interface.
(b) Turn ignition switch to ON position.
(c) Clear DTC code.
(d) Start and run the engine at idle speed to warm up the engine for at least 5 min.
(e) Road test the vehicle for at least 10 min.
(f) Read control system DTC code again to confirm that the system has no DTC code.
Step 10
Troubleshooting
5. Maintenance
guide
:
Refer to 2.2.8.5 “Replacement of Fuel Injectors” to replace the fuel injectors.
No
Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.
Yes
236
2.2.7.33 DTC P0300
1. DTC
description:
DTC P0300
Multi-Cylinder Misfire
The engine control module (ECM) uses information from the crankshaft position (CKP) sensor
and the camshaft position (CMP) sensors to determine when an engine mis?re is occurring. By
monitoring variations in the crankshaft rotation speed for each cylinder ECM is able to detect
individual mis?re events. When a misfire happens, unburnt mixture will be discharged into the
exhaust system and burnt in the 3-way catalytic converter (TWC) which will overheat the
converter. A misfire rate that is high enough can cause 3-way catalytic converter damage. The
malfunction indicator lamp (MIL) will ash ON and OFF when the conditions for catalytic
converter overheated are present. A DTC will be set.
2. Setting DTC code and Fault Location:
DTC Code
DTC Detection
Strategy
Conditions For Setting The
DTC (Control Strategy)
Fault Locations
P0300
Under stable
operating
conditions, ECM
detects the
crankshaft
rotation speed
fluctuations.
Under stable operating
conditions, When the ECM
detects the crankshaft rotation
speed fluctuations exceeding the
threshold set by the system:
When the fire degree is too low
for affecting the exhaust
emission, without emergency
control scheme, only record the
fault code and freeze the data
stream as well as turn on the
fault indication.
Lamp; when the fire degree is
too high, which may lead to
overheating of the catalyst,
compel to entering the fuel
open-loop control working
condition, and inhibit oxygen
correction learning. The fault
indicator lamp flickers with the
frequency of 1HZ.
1. Connector Loose or
Poor Connection
2. Vacuum Tube Hose
Broken or Loose
3. Ignition
System
4. Fuel
Injectors
5. Fuel
Pressure
6. Intake Air Pressure
Sensor
7. Engine
Coolant
Temperature Sensor
8. Cylinder
Compression
Pressure
9. Valve Clearance and
Timing
10. Evaporative Emission
Control System
11. Purged
Crankcase
Ventilation System
12. Intake System
13. Poor Exhaust System
Ventilation
14. ECM.
237
3. Circuit
sketch
Ignition System
蓄电池
EF40
EF21
主继电器ER09
87
30
86
85
4
EM01 COILA
EM01 MPR
1
EM01 COILB
81
44
EM01 COILD
62
EM01 COILC
发
动
机
控
制
模
块
一缸点火线圈
3
1
2
二缸点火线圈
3
1
2
三缸点火线圈
3
1
2
四缸点火线圈
3
1
2
NL02-0049c
Fuel Injector Nozzle
主继电器ER09
87
30
86
85
EM01
44
EM01
B
A
发
动
机
控
制
模
块
蓄电池
EF4
0
EF22
1缸喷油器
3缸喷油器
4缸喷油器
2缸喷油器
6
MPR
INJA
EM01
B
A
7
INJB
EM01
B
A
25
INJC
EM01
B
A
8
INJD
NL02-0043c
1. Diagnostic
Steps:
Notes:
–
If the control system stores DTC other than misfire, diagnose these DTC first and eliminate
the faults.
Main relay ER09
Battery
One cylinder ignition coil
Two cylindersignition
coil
Three cylindersignition coil
Four cylinderignition
coil
Engi
ne
contro
l
modu
le
Main relay ER09
Battery
1st cyinder
oil injecter
3rd cyinder
oil injecter
4th cyinder
oil injecter
2nd cyinder
oil injecter
Engi
ne
co
ntr
ol mo
dul
e
238