Geely CK Series 2007 Workshop Manual page 165

III. CUSTOMER FAULT ANALYSIS
NOTES:
1. When the troubleshooting analysis is underway, make sure to confirm the fault symptom correctly. Re-
move kinds of suppositions in order to make an exact judgment. In order to find out what on earth the fault is,
it is extremely important to ask customers about the fault symptoms and the conditions when faults occurred.
2. The 5 items below are the key points to analyze. Those faults that were considered irrelevant and the
repair history, etc are sometimes helpful. Therefore, try your best to collect relevant information, and find out
the relationship between the information you collected and the present information, in order to make refer-
ence in troubleshooting.
Key points of the Customer fault analysis:
1
Vehicle model, system name
2
Date, time, frequency fault occurs
3
Pavement conditions
4
Running performance, driving and weather conditions
5
Fault symptom
IV. FAULT SYMPTOM AND DTCS
NOTES:
1. The diagnosis system of the Free Cruiser possesses many features. The first important feature is the DTC
Checking. Input a fault from the ECU signal circuit in the form of code, and store it into the ECU memory.
The other feature is Input Signal Inspection. Inspect if the signals from different switches are correctly
inputted into the ECU. These features can quickly narrow the range of troubleshooting, to make an efficient
troubleshooting analysis. In the model of Free Cruiser, the systems below all possess the diagnosis feature.
1
EFI system
2
ABS system
3
Supplemental Restraint System (SRS)
2. When a DTC is checked, the very important point is: make sure if the fault shown by a DTC still exists, but
is normal now. In addition, when checking the fault symptom, you must check if there is direct relationship
between the fault shown by the DTC and the fault symptom. Therefore, the DTC should be checked before
and after confirming the fault symptom in order to confirm the present conditions. If you do not do so, it is
possible to make some unnecessary troubleshooting analysis on normal systems in some certain circumstances,
thus making it more difficult to locate the fault or repair according to the fault. So, a DTC check should be
done by a normal procedure.
3. The procedure below shows how to make a troubleshooting analysis by checking a DTC and how to make
efficient use of DTC check. Then carefully check the result, make a troubleshooting analysis of the DTC and
a troubleshooting analysis of the symptom.
1
Inspect DTC
2
Record and clear all DTCs
3
Confirm fault symptom
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