Toyota 8FDU15, Manual

Page: 591 / 618

3-22 3-22
z
<POOR DRIVABILITY> INSUFFICIENT POWER OUTPUT
Probable cause
• Air-fuel ratio abnormality (over-lean)
• Initial advance timing off
Note:
• After disconnecting the battery terminal or removing the LPG fuse, the fuel system learning value will be
cleared. This may cause temporary insufficient power output. (Power output will return after being
driven for a short while.)
• If a fuel with low pressure vaporization is used in winter, it is possible that the air-fuel ratio may be
abnormal (over-rich).
Inspect O
2
sensor feedback
(Refer to parts inspection and adjustment 14)
Inspect water temperature (THW)
Inspect LPG filter
OK
NG
Replace LPG filter
Inspect, identify fault, and repair, cleaning
system NG
OK
Repair vacuum piping
NG
Inspect vacuum piping of vacuum sensor
Standard: No hoses disconnected, blocked
or bent
OK
Adjust initial advance timing
(Refer to page 2-16) NG
Inspect initial advance timing
(Refer to page 2-16)
OK
O
2
Sensor system defect
NG
OK
Inspect electronic throttle system
NG
Inspect the full open status of the throttle valve
Inspect the aperture (TA) of the throttle valve
when the accelerator pedal is depressed once.
Standard: 96 %
OK
Repair or replace
NG
Inspect inner vent system
(1) Check inner vent tube for damage, bent or
disconnection
(2) Check resonator for damage
OK
03.book 22 ページ ２００７年２月２２日 木曜日 午後４時４７分
LPG Device for 4Y-E Engine
Section 1.3.3