Great Wall service chassis and body Manual - part 69
BE-5
If there is diode in the circuit, connect the two leads in reverse
polar and make another inspection. When the cathode lead (-)
is connected with the positive (+) side of diode, and the
positive (+) lead should be connected with the cathode (-) lead
of diode, the diode should conduct, while the two leads
connected to the reverse polar, the diode should not contact.
Remark: the specification may be not same due to different
testing meter types; therefore, the application instruction for
testing meter should be referred before the inspection.
Check the light emitting diode (LED) according to the same
approach for diode inspection.
Remark:
The testing meter should be used the one with 3V voltage or the
one has larger resistance than that in circuit.
If no suitable testing meter is applied, the voltage of accumu-
lator may be added to check the LED to see whether it is
lighted.
(c)
Use the voltage or ohmn meter with high-impedance
(min voltage of 10 KV) to diagnose the failure in electric
circuit.
Body Electric System
Brief Introduction
0
0
K
K
ohmn meter
diode
0
0
K
K
ohmn
LED
digital type
analogue type
DC
D
C
V
LG terminal of ignition switch
testing bubble
fuse box
short circuit
SW1
short circuit
disconnection
electromagnetic
coil
short circuit
disconnection
disconnectiong
Check to see whether there is short circuit
(a)
Tear down the burned fuse and remove all loads from
the fuse.
(b)
Connect the testing bubble at the fuse position;
(c)
Verify the situation of testing bubble position:
For example:
Put the ignition switch of SW atON position;
Put the ignition switch of SW and SW1 atON position;
Put the ignition switch of SW, SW1 and Relay at
ON position (which connects with the relay), and put
SW2 at
OFF) position (or disconnect the SW2).
(d)
Disconnect or re-connect the plugging elements when
observing the testing bubble. In case the testing bubble
keeps lighting, which shows there is short circuit between
the plugging elements; if the testing bubble extinguishes,
there is short circuit between the plugging elements.
(e)
Shake the trouble wire alongside the body to locate the
SW2
electromagnetic
coil