Engine Is Slow To Rev Up; The Idle Speed Does Not Rise Even If The Lift Is Raised - Toyota 8FGU15 Repair Manual

8-156
Control type
Travel and load
handling control
Phenomenon on Malfunction area
vehicle and mode
For vehicles with
travel and load
handling control:
Engine is always
slow to rev up.
(Even with the direc-
tion lever left in F or
R position and the
brake applied, the
engine is still slow to
rev up)
For vehicles with
travel and load
handling control:
Even if the lift is
raised, the idle
speed does not rise.
Checking method
▪ Brake switch
unit:
Open fault
(Stuck in de-
pressed state, or
ON/OFF check with
internal damage)
analyzer
▪ Brake switch
line:
Disconnection
fault (Harness,
connector, fuse)
▪ Accelerator
sensor unit:
Accelerator pedal
Internal damage
position check:
▪ Accelerator
Check the opening
sensor installa-
degree of the accel-
tion:
erator pedal when
Link, installation
not operated.
part destroyed,
damaged
▪ SAS/OPS con-
troller:
-
Controller defect
▪ Lift raise switch
unit:
Open fault
(Switch mounted
incorrectly, in-
ternal damage,
stuck)
▪ Lift raise switch
ON/OFF check with
line:
analyzer
Disconnection
fault (Harness,
connector)
▪ Switch ground
line:
Disconnection
fault (Harness,
connector)
▪ Display setting:
Lift idle up dis-
Check settings with
abled, Idle up
option set and tuning
speed tuning
value low
▪ SAS/OPS con-
troller:
-
Controller defect
8 TROUBLESHOOTING
Corrective action
Harness check or re-
place switch
If not close to 0%,
installation check or
replace sensor.
Replace
Harness check or re-
place switch
Change
Replace