Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 591 / 1976

- DIAGNOSTICS ENGINE
DI-53
207
Author: Date:
2001 SIENNA (RM787U)
The A/F sensors (bank 1, 2 sensor 1) output voltage and the short-term fuel trim value can be read
using the OBD II scan tool or TOYOTA hand-held tester.
The ECM controls the voltage of AF and AF terminals of ECM to the fixed voltage. Therefore, it
is impossible to confirm the A/F sensor output voltage without OBD II scan tool or TOYOTA hand-held
tester.
OBD II scan tool (excluding TOYOTA hand-held tester) displays the one fifth of the A/F sensors (bank
1, 2 sensor 1) output voltage which is displayed on the TOYOTA hand-held tester.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Check air induction system (See page SF-1 ).
NG Repair or replace.
OK
2 Check injector injection (See page SF-26 ).
NG Replace injector.
OK
3 Check mass air flow meter and engine coolant temp. sensor (See pages SF-35
and SF-76 ).
NG Repair or replace.
OK