Toyota ZZT230 series, Repair Manual

Page: 257 / 821

Dl-46
INSPECTION PROCEDURE
HINT:
•
If the vehicle run out of fuel, the air-fuel ratio is LEAN and DTC P0125 will be recorded .
The MIL then comes on.
•
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 Are there any other codes (besides DTC P0125) being output
?
Go
10 rele
v
a
n
t DTC chart.
2
Connect the OBD II seen tool or TOYOTA hand-held tester and reed value for
vollage output
of
oxygen sensor (bank 1 sensor
1
).
PREPARATION:
(a) Connect the OBD II
scan
tool or TOYOTA hand-held tester to the DLC3.
(b) Warm up engine to normal operating temp (above 75°C).
CHECK:
Read voltage output of the oxygen sensor {bank 1 sensor 1 ) when engine is suddenly raced.
HINT:
Perform quick
racing
to 4,000
rpm 3
times using accelerator pedal.
OK:
3
Both
oxygen
sensor
(bank 1 sensor 1)
o
u
t
p
ut
a RICH signal (0.45
V or more) at least once.
Go to step 10.
Check for o
r.
n and short In harness and connector between ECM and oxygen
sensor (ban 1 sensor 1) (See page IN-30).
Repair or
replace harness
or
connector.