EFI SYSTEM — Diagnosis System
FI-21
DIAGNOSIS SYSTEM
DESCRIPTION
The ECU contains a built-in self-diagnosis system by which
troubles with the engine signal network are detected and a
"CHECK" engine warning light on the instrument panel
flashes.
By analyzing various signals as shown in the later tables (See
pages FI-24, 25) the ECU detects system malfunctions which
are related to the various operating parameter sensors or actu-
ator. The ECU stores the failure code associated with the
detected failure until the diagnosis system is cleared by re-
moving the EFI fuse with the ignition switch OFF.
The "CHECK" engine warning light on the instrument panel
informs the driver that a malfunction has been detected.
The light goes out automatically when the malfunction has
been cleared.
"CHECK" Engine
CHECK
Warning Light
F12369
Check Connector
0
N
on
^ 000
020 TE1
0 12Q E1
Service
Wire
F12411
"CHECK" ENGINE WARNING LIGHT
CHECK
1.
The "CHECK" engine warning light will come on when
the ignition switch is placed at ON and the engine is not
running.
2.
When the engine is started, the "CHECK" engine warn-
ing light should go out.
If the light remains on, the diagnosis system has detected
a malfunction or abnormality in the system.
OUTPUT OF DIAGNOSTIC CODES
To obtain an output of diagnostic codes, proceed as follow:
1.
Initial conditions
(a)
Battery voltage 11 volts or more
(b)
Throttle valve fully closed (throttle position sensor
IDL points closed)
(c)
Transmission in neutral
(d)
Accessories switched OFF
(e)
Engine at normal operating temperature
2.
Turn the ignition switch to ON. Do not start the engine.
3.
Using a service wire, connect terminals TE1 and
El
of the
check connector.
J
Summary of Contents for 3F-E
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