−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
DI
−
645
2005 CELICA (RM1131U)
DTC
P2646
OCV for VVTL Close Malfunction (Bank 1)
DTC
P2647
OCV for VVTL Open Malfunction (Bank 1)
CIRCUIT DESCRIPTION
Refer to DTC P2645 on page DI
−
640.
DTC No.
DTC Detecting Condition
Trouble Area
P2646
In the condition that the water temperature is 60
°
C or more,
the engine speed is 6,000 rpm or more, and the oil pressure
switch is off for 1 sec. or more.
S
Open or short in OCV circuit
S
OCV for VVT
−
L
S
Oil pressure switch for VVT
−
L
S
ECM
P2647
In the condition that the engine speed is 6,000 rpm or less and
the oil pressure switch is on for 5 sec. or more.
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 6,500 rpm or more, the ECM increases the OCV control signal duty
−
ratio and it
opens the oil passage to VVTL
−
i actuator. The engine oil pressure powered actuator advances the cam fol-
lower shims and valves begin using the high
−
lift cam.
The VVTL
−
i oil pressure switch senses the engine oil pressure applied to the VVTL
−
i system and the ECM
judges which cam (standard cam or high
−
lift cam) is used based on the switch output. If the engine oil pres-
sure applied to the VVTL
−
i system is high when the standard cam is required by the ECM or if the pressure
is low when the high
−
lift cam is required, the ECM will determine that there is a malfunction in the OCV for
VVTL and set a DTC.
MONITOR STRATEGY
Related DTCs
P2646
Cam does not change to high
−
lift cam
P2647
Cam does not change to standard cam
Required sensors/components
Main sensors/components
Oil pressure switch for VVTL
−
i
Related sensors/components
Vehicle speed sensor, ECT sensor, Crankshaft
position sensor
Frequency of operation
Continuous
Duration
Within 5 sec.
MIL operation
Immediate
Sequence of operation
None
DIC7Y
−
02
843
Содержание Celica 2005
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