A01434
180
˚
EM--4
--
ENGINE MECHANICAL
CO (1RZ--E, 3RZ--FE)
HINT:
The idle mixture adjusting screw can be tightened through on
angle of 260
˚
.
S
If the CO concentration is within specification, this
adjustment is complete.
S
If the CO concentration cannot be corrected by idle
mixture adjustment, see the table below for other
possible causes.
3. TROUBLESHOOTING
S
1RZ--E:
CO
Problems
Causes
High
Rough idle
1 Restricted air filter
High
Rough idle
(Black smoke from exhaust)
1. Restricted air filter
2 Plugged PCV valve
(Black smoke from exhaust)
2. Plugged PCV valve
3. Faulty EFI system:
3. Faulty EFI system:
S
Faulty Pressure regulator
S
Faulty Pressure regulator
S
Clogged fuel return line
S
Clogged fuel return line
S
Defective water temperature sensor
S
Defective water temperature sensor
S
Defective intake air temperature sensor
Defective intake air temperature sensor
S
Faulty engine ECU
Faulty engine ECU
S
Faulty injectors
Faulty injectors
S
Faulty air flow meter
y
S
Faulty throttle position sensor
S
3RZ--FE:
CO
Problems
Causes
High
Rough idle
1 Clogged air filter
High
Rough idle
(Black smoke from exhaust)
1. Clogged air filter
2 Plugged PCV valve
(Black smoke from exhaust)
2. Plugged PCV valve
3 F lt EFI
t
3. Faulty EFI system:
F lt P
l t
S
Faulty Pressure regulator
Cl
d f l t
li
S
Clogged fuel return line
D f
i
S
Defective water temperature sensor
S
Defective intake air temperature sensor
S
Faulty engine ECU
S
Faulty injectors
y j
S
Faulty air flow meter
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3RZ-F,3RZ-FE