JAC J2 - Page 169

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
Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
168
Schematic Diagram for Malfunction Diagnosis of Electronic Injection System
3.
Control
strategy
of
malfunction
indicator
lamp
1)
When
no
malfunction
is
present:
★
 The malfunction indi
cator la
mp lights up after the ignition switc
h is turne
d on (ON) and then goes
out after 4s.
★

If the engine
is started
within 4s, the
malfunction indicator lamp
goes out upon
detection of
speed
signal.
★

After the K-line
is grounded for more
than 2.5s, the
malfunction indicator lamp
will flash at
a
frequency of 2Hz.
2)
When
a
malfunction
is
present:
★

The malfunction
indicator lamp
will b
e
always on
after the
ignition switch
is turned
on (ON).
★

After the engine
is started,
the malfunction indicator lamp
will go
out upon detection of speed
signal. If the malfunction indicator lamp in question is defined as ON mode in the malfunction
category, the malfunction indicator lamp will be always on after the corresponding conditions are
met.
4.
Inspection
steps
1)
For the
vehicles with
OBD function, inspection should be carried out always with steps below:
OBD Inspection Steps
1.

Connect the diagnosis equipment to the
diagnosis connect
or to
put through it.
Function
diagnosis
Electronic
control unit
Data
collection
Function
diagnosis
Control command
Actuators
Sensors
Engine