A07621
A09776
Right Bank OCV
1
2
R-B
L-B
ECM
OC1+
OC1-
OC2+
OC2-
29
18
Left Bank OCV
R-W
R
1
2
E12
6
5
E12
E12
E12
-
DIAGNOSTICS
ENGINE
DI-123
277
Author:
Date:
DTC
P1349
VVT System Malfunction (Bank 1)
DTC
P1354
VVT System Malfunction (Bank 2)
CIRCUIT DESCRIPTION
The VVT system constantly adjusts intake valve timing based upon operating conditions. The ECM controls
the Oil Control Valve (OCV) with a variable duty cycle. The Oil Control Valve then supplies oil to the advance
or retard side of the VVT Controller. The oil applied to the VVT Controller will cause the intake cam to advance
or retard depending on the position of the Oil Control Valve. The ECM verifies that the desired camshaft
angle has been achieved by monitoring the camshaft position sensor.
DTC No.
DTC Detecting Condition
Trouble Area
P1349
P1354
Condition (a) or (b) continues for after the engine is warmed up
and engine speed at 400 - 4,000 rpm:
(a) Valve timing does not change from of current valve timing
(b) Current valve timing is fixed
Valve timing
OCV
VVT controller assembly
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC P1349 is displayed, check right bank VVT system circuit.
If DTC P1354 is displayed, check left bank VVT system circuit.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
DI6TB-02
