Fault Table; Troubleshooting; Totally Do Not Work; Check Whether Output Signal Exists - Lifan 620 Maintenance Manual

3. Fault table, Table 4-23
Fault
Totally can not work (can not
self-check)
Sometimes LCD indicator
does not work (can
self-check)
When in reverse gear,
system does not work (can
self-check)
V. Troubleshooting

1. Totally do not work

(1) Check circuit as shown in Fig. 4-115
(2) Check step
1) Disconnect reverse radar probe wire harness connector, check the impedance of foot 3 in the
previous figure and vehicle body, the impedance shall be less than 1Ω.
2) Turn ignition switch to ON, take reverse gear, check the voltage of foot 1 in the previous figure
and vehicle body, the voltage shall be 10-14V. If it is normal, replace reverse radar; if not, proceed
to the next step.
2. Buzzer does not work, check whether it is damaged.
(1) Check circuit as shown in Fig. 4-115
(2) Check step

1) Check whether output signal exists

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Table 4-23
Cause
1.Fault in power circuit
2.Fault in reverse radar
1.Fault in indicator drive
circuit
2.Fault in reverse radar
1.Fault in reverse gear
switch circuit
2.Fault in reverse radar
Fig. 4-115
265
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Fault
Buzzer does not 1. Fault in buzzer drive
work (can circuit
self-check) 2. Fault in reverse radar
1. Fault in sensor or
Open circuit or
sensor influenced by
freezing indicated
external environment
in self-checking
2. Fault in sensor circuit
1. Fault in buzzer drive
Volume of buzzer is
circuit
too low
2. Fault in reverse radar
Cause