Troubleshooting And Steps; Troubleshooting With Dtc - Lifan 620 Maintenance Manual

contaminated, change it. Refer to Fig. 4-12.
IV. Troubleshooting and steps
1. Fault verification
Switch on all components of faulty circuit to verify the fault, and pay attention to symptoms. Before
locate the fault, do not start dismantling or testing.
2. Analysis based on principles
Refer to the schematic diagram to determine the faulty circuit. Start from the power supply, and
check each component along the current path, till the earth, to figure out the operating principle of
circuit. If there is more than one faulty circuit at the same time, then fuse or earth is likely cause.
Figure out one cause or more of the fault, basing on symptoms and understanding to the operating
principle of circuit.
3. Insulate the malfunction during circuit testing, to check up the diagnosis made in step 2. Mind
that organized and concise steps are critical for troubleshooting, i.e. first test the most probably
faulty point by way of the approachable points.
4. Trouble handling
Repair at once when the fault is identified. Use the right tools in accordance with safe operation
steps.
5. Confirmation of normal operation
Switch on all components along the repaired loop under all operating modes to make sure that all
faults are eliminated. If the fault is a blown fuse, then testing of all circuits connected by the fuse is
required. Make sure no new fault arises, and the original fault does not occur again.
V. Troubleshooting with DTC
1. Vehicle entry
Make registration
①
Clean the car
②
③ Make a record of current environment
2. Trouble record and analysis
Make an inquiry on trouble details, like the status and environment when the trouble occurs.
3. Symptom verification and DTC inspection
① Check the battery voltage during engine flameout
② Check the harness, connector, and fuse
③ Run the engine at normal operating conditions, verify symptoms and conditions, make DTC
inspection according to the DTC attached.
4. Use of DTC or trouble symptom table
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Fig. 4-12
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