Geely EC718 2009 Workshop Manual page 688

2-606 Control System JL4G15-D
2.12.7 Diagnostic Information and Procedures
2.12.7.1 Diagnosis Description
Before carry out the control system diagnostic. Refer
Understand and get familiar with control system working principle, and then start systematic diagnostic, so that it will help to determine
the correct diagnostic steps, more importantly, it also help to determine whether the customer described situation is normal.
Before any control system fault diagnostic, using
to take the next logical step for fault diagnosis. Understand and correctly use the diagnostic flow chart can reduce the diagnostic
time and avoid misjudge on components.
2.12.7.2 Control System Check
For 4G15-D engine control system check. Refer to the 4G18-D
2.12.7.3 Intermittent Fault Check
For 4G15-D engine intermittent fault check, please refer to the 4G18-D
2.12.7.4 Symptoms Table
If a malfunction occurs, but it has been not stored in ECM DTC code (DTC), and its faulty reason can not be identified in the basic
diagnostic, carry out the diagnostic based on the following table listed order.
Symptoms
Retardation, Engine Speed Decreases,
Speed Instability
Fault Definition: When pressing the
acceleration pedal, there
response. At any
malfunction may occur. Start the vehicle
for the first time (for example, start after
parking), this malfunction is usually
more obvious. In severe cases, this
malfunction may lead to engine stalling.
Only when Air-Conditioning is working,
the engine stalls.
EC718/EC718RV EC715/EC715RV 10/2009
the2.2.7.2 Control System
Suspected Faulty Items
1.ECM Power Supply Circuit
2. Intake Manifold Absolute Pressure (MAP)
Sensor
3. Fuel Pressure Abnormal
4. Injector Working Abnormal
5. Mixture Too Rich
6. Mixture Too Lean
is no
7. Ignition system: spark plug abnormal, ignition
speed, this
wires abnormal.
8. Knock Sensor (KS) system, the ignition delay
is too great.
9. Crankshaft Position Sensor
10. Thermostat Abnormal
11. Generators Working Abnormal
1. Air-Conditioning Signal Circuit
to2.12.2 Description and Operationand2.12.3 System Working
Checkas a starting point to guide the servie personnel
engine2.2.7.2 Control System
engine2.2.7.3 Intermittent Fault
Check.
Check.
Relevant Sections
Refer to 2.12.7.43 DTC P0562 P0563
Refer to 2.12.7.18 DTC P0107 P0108
Refer to2.13 Fuel System JL4G15-
Din2.13.1 Diagnostic Information and
Procedures
Refer to 2.12.7.26 DTC P0171 P0172
P1167 P1171 P2187 P2188
Refer to2.20 Ignition System JL4G15-
Din2.20.4 Diagnostic Information and
Procedures
Refer to 2.12.7.35 DTC P0335 P0336
2.18 Engine Cooling System JL4G15-
Din2.18.3 Diagnostic Information and
Procedures
Refer to2.11 Starting /
System JL4G18-Din2.11.7 Diagnostic
Information and Procedures
Refer to8.2 Automatic Air-
conditioningin8.2.7 Diagnostic
Information and Procedures
Engine
Principle.
Charging