Diagnosis System Description; Malfunction Indicator Lamp; Diagnostic Trouble Codes Output - Toyota 22R-E Service Manual

EG1–110
ENGINE – MFI SYSTEM
DIAGNOSIS SYSTEM
DESCRIPTION
The ECM contains a built–in self–diagnosis system
which detects troubles within the engine signal net–
work and flashes the Malfunction Indicator Lamp in
the combination meter.
By analyzing various signals shown in the table(See
pages EG1–114,115)the detects system malfunctions
which are related to the various operating parameter
sensors or to the actuator.
The ECM stores the failure code associated with the
detected failure until the diagnosis system is cleared
by removing the EFI fuse with the ignition switch off.
The malfunction Indicator Lamp in the combination
meter informs the driver that a malfunction has been
detected. The light goes automatically when the
malfunction has been corrected.

MALFUNCTION INDICATOR LAMP

1. The Malfunction Indicator Lamp will come on when
the ignition switch is placed at On and the engine is
not running.
2. When the engine is started, the Malfunction Indi–
cator Lamp should go off.
If the light remains on, the diagnosis system has
detected a malfunction or abnormality in the system.

DIAGNOSTIC TROUBLE CODES OUTPUT

To obtain an output of diagnostic trouble codes,
proceed as follows:
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 range.