Malfunction Indicator Lamp Check; Diagnostic Trouble Code Check - Toyota 1 MZ–FE Manual

EG2–402
1MZ–FE ENGINE – DIAGNOSIS SYSTEM
Diagnosis Inspection (Normal Mode)

MALFUNCTION INDICATOR LAMP CHECK

1. The malfunction indicator lamp comes on when the igni–
tion switch is turned ON and the engine is not running.
HINT: If the malfunction indicator lamp does not light
up, troubleshoot the combination meter.
(See page BE–64).
2. When the engine is started, the malfunction indicator
lamp should go off. If the lamp remains on, the diagnosis
system has detected a malfunction or abnormality in the
system.

DIAGNOSTIC TROUBLE CODE CHECK

NOTICE (TOYOTA hand–held tester only): When the diag–
nosis system is switched from normal mode to check mode,
it erases all diagnostic trouble codes and freezed frame
data recorded in normal mode. So before switching modes,
always check the diagnostic trouble codes and freezed
frame data, and note them down.
1. Prepare the OBDII scan tool (complying with SAE
J1978) or TOYOTA hand–held tester.
2. Connect the OBDll scan tool or TOYOTA hand–held
tester to data link connector 3 in the fuse box at the lower
left of the instrument panel.
3. Turn the ignition switch ON and turn the OBDII scan tool
or TOYOTA hand–held tester switch ON.
4. Use the OBDII scan tool or TOYOTA hand–held tester to
check the diagnostic trouble codes and freezed frame
data, note them down. (For operating instructions, see
the OBDll scan tool's instruction book.)
5. See page EG2–404 to confirm the details of the diagnostic
trouble codes.
NOTICE: When simulating symptoms with an OBDll scan
tool (excluding TOYOTA hand–held tester) to check the di–
agnostic trouble codes, use normal mode. For codes on the
diagnostic trouble code chart subject to "2 trip detection
logic", turn the ignition switch OFF after the symptom is
simulated the first time. Then repeat the simulation process
again. When the problem has been simulated twice, the MIL
lights up and the diagnostic trouble codes are recorded in
the ECM .
Diagnosis Inspection (Check Mode)
TOYOTA HAND–HELD TESTER only
Compared to the normal mode, the check mode has an in–
creased sensitivity to detect malfunctions.
Furthermore, the same diagnostic items which are detected in
the normal mode can also be detected in the check mode.