Toyota ZZT230 series Repair Manual page 278

INSPECTION PROCEDURE
•
HINT:
•
If is the case that DTC besides misfire is memorized simultaneously, first perform the troubleshooting
for them.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
data 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
ratlo lean or rich, etc. at the time of the malfunction.
When the vehicle is brought to the workshop and the misfire is not occurred, misfire can be confirmed
•
by reproducing the condition or freeze frame data. Also, after finishing the repair, confirm that there
is no misfire. (See the confirmation driving pattern)
When either of SHORT
•
is besides the range of ±20%, there is a possibility that the air-fuel ratio is inclining either to HrichH
(-20% or less) or "lean" (+20% or more).
•
When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility or
misfire only during warming up.
In the case that misfire cannot be reproduced, the reason may be because of the driving with lack or
fuel, the use of improper fuel, a stain of ignition plug, and etc.
1 Check wire hamess, connector and vacuum hose in engine room.
CHECK:
(a) Check the connect'1on conditions of wire harness and connector.
)
(b) Check the disconnection, piping and break of vacuum hose.
)
DIAGNOSTICS
FT
FT
#1, LONG #1, SHORT
ENGINE
FT #2 FT #2
or LONG
misfire (See t h e confirmation driving pattern).
01-67
in the freeze frame data