Geely EC718, EC718RV, EC715, EC715RV. Manual part — 29
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 29
13
14
Engine Control Module
Pre-catalytic Oxygen Sensor
Post-catalytic Oxygen Sensor
Vehicle
Speed
Sensor
FE02-2103b
Engine
Control System JL4G18-D
2-31
2.2.7 Diagnostic Information and Procedures
2.2.7.1 Diagnostic Description
Before diagnose the control system, please refer to
and
. Understand and become
familiar with control system working principle and then start systematic diagnosis, so that in the event of faults it will help determine
the correct Diagnostic Steps, more importantly, it will also help to determine whether the customer described situation is normal or
not.
Any control system fault diagnosis should start with "Control System Check" as a starting point. "Control System Check" will guide
the service personnel to take the next logical step to diagnose the fault. Understand and the correct use of diagnostic flow charts
can reduce diagnostic time and avoid misjudging a component.
2.2.7.2 Control System Check
Before the control system check, please do following preliminary checks:
1. Check the battery terminal voltage to ensure an adequate power supply and a stable voltage.
2. Check the battery cables, clean and tighten.
3. Check the easy to access system components whether there are obvious damages that may cause the symptoms, such as
vacuum tube damage and the reliability of wiring harness connectors connection.
4. Check control module and battery ground points whether there are copper oxidizing or signs of loosening.
5. Check control system whether it is likely to affect the normal system operation after the installation of aftermarket equipments.
Diagnostic Steps:
Step 1
Verify customer described faults.
Next
Step 2
Connect a scan tool.
(a)
Install the scan tool.
(b)
Turn on the scan tool.
Is the scan tool connected?
No
Yes
Step 3
Start communication between the scan tool and the engine control module.
(a)
Turn the ignition switch to "ON", but do not Start the engine.
(b)
Try to establish communication between the scan tool and
engine control module (ECM) .
Can the scan tool communicate with engine control module?
No
Yes
Step 4
Start the engine and run at idle speed. Can the engine start?
2-32
Control System JL4G18-D
Engine
No
Yes
Step 5
Select engine control module DTC code reading function. Is there any system DTC code?
No
Yes
Step 6
Record and clear the DTC code.
Next
Step 7
Verify fault symptoms.
Results
To Step
Fault does not appear.
Yes
Fault appears.
No
No
Yes
Step 8
Simulate fault symptoms.
Next
Step 9
Check control system whether there is a DTC code.
Results
To Step
DTC Code
Yes
No DTC Code
No
No
Yes
Step 10
Repair according to the DTC code. Refer to
Step 11
Connect the scan tool to a proper operated vehicle. Can the scan tool be turned on?
No
The scan tool failed. Replace the scan tool.
Yes
Step 12
Check datalink connector power supply circuit.
Engine
Control System JL4G18-D
2-33
FE02-5000b
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
9
Datalink Connector IP12
(a)
Turn the ignition switch to "ON" position.
(b)
Measure the voltage between datalink connector IP12
terminal 16 and a reliable ground.
Standard Voltage: 11-14 V
Is the voltage normal?
No
Check if the circuit between terminal 16 and
the IF21 fuse open.
Yes
Step 13
Check datalink connector ground circuit.
FE02-5001b
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
9
Datalink Connector IP12
(a)
Turn the ignition switch to "OFF" position.
(b)
Measure the voltage between datalink connector IP12
terminal 4 and a reliable ground.
Standard Resistance: Less than 1 Ω
No
Check if the circuit between terminal 4 and the
ground open.
Yes
Step 14
Is the engine running properly?
No
Engine immobilizer control module and ECM
communication failure, check and repair the
relevant components. Refer to
Engine Anti-theft Warning Lamp
Flashing, Vehicle Can Not Start
Yes
Step 15
Terminal continuity check.
2-34
Control System JL4G18-D
Engine
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст