Toyota Celica 2005 Repair Manual page 844

DTC P2646
DTC P2647
CIRCUIT DESCRIPTION
Refer to DTC P2645 on page DI−640.
DTC No.
In the condition that the water temperature is 60 °C or more,
P2646 the engine speed is 6,000 rpm or more, and the oil pressure
switch is off for 1 sec. or more.
In the condition that the engine speed is 6,000 rpm or less and
P2647
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
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
2005 CELICA (RM1131U)
DIAGNOSTICS
OCV for VVTL Close Malfunction (Bank 1)
OCV for VVTL Open Malfunction (Bank 1)
DTC Detecting Condition
Main sensors/components
Related sensors/components
Continuous
Within 5 sec.
Immediate
None
− ENGINE (2ZZ−GE)
S Open or short in OCV circuit
S OCV for VVT−L
S Oil pressure switch for VVT−L
S ECM
P2646
P2647
843
Trouble Area
Cam does not change to high−lift cam
Cam does not change to standard cam
Oil pressure switch for VVTL−i
Vehicle speed sensor, ECT sensor, Crankshaft
position sensor
DI−645
DIC7Y−02