DI
−
640
−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
2005 CELICA (RM1131U)
DTC
P2645
OCV for VVTL Circuit (Bank 1)
CIRCUIT DESCRIPTION
In order to improve the engine performance at both high and low engine speeds, the VVTL
−
i system varies
valve lift using the standard cam and high lift cam. This provides the high power engine performance as well
as an emission reduction and good fuel economy.
When the engine speed reaches 6,000 rpm, the ECM sends signals the OCV for VVTL
−
i to switch the effec-
tive cam from standard one to high lift one hydraulically.
The ECM controls the OCV to apply hydraulic pressure to the piston in the rocker arm and switches the rocker
arm by locking the slipper for high speed.
DTC No.
DTC Detecting Condition
Trouble Area
P2645
Open or short in oil control valve for VVTL circuit
S
Open or short in OCV circuit
S
OCV for VVTL
−
i
S
Oil pressure switch for VVTL
−
i
S
ECM
MONITOR DESCRIPTION
When the engine RPM is high, the VVTL
−
i actuator advances shims under the high
−
lift cam followers using
engine oil pressure. Switching to the high
−
lift cam increases the valve lift as well as the intake air volume
and exhaust capacity. These changes increase the engine’s power output.
When the engine RPM is 6,000 rpm or more, the ECM increases the OCV control signal duty
−
ratio and it
opens the oil passage to the VVTL
−
i actuator. The engine oil pressure powered actuator advances the cam
follower shims and valves begin using the high
−
lift cam.
The ECM senses the current flow to the OCV to determine the “actual” duty
−
ratio of the control signal. If the
duty
−
ratio is out of the normal range, the ECM interprets this as a malfunction in the OCV. The ECM will illumi-
nate the MIL and a DTC will be set.
MONITOR STRATEGY
Related DTCs
P2645
OCV for VVTL
−
i circuit is open/shorted
Required sensors/components
OCV for VVTL
−
i
Frequency of operation
Continuous
Duration
1 sec.
MIL operation
Immediate
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
Item
Specification
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page DI
−
295
Battery Voltage
11 V
−
Starter
OFF
DIC7X
−
02
838
Содержание Celica 2005
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