Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip1349p
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DI-123
DIAGNOSTICS - ENGINE
DI6TB-02
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
Condition (a) or (b) continues for after the engine is warmed up S Valve timing
P1349 and engine speed at 400 - 4,000 rpm: S OCV
P1354 (a) Valve timing does not change from of current valve timing S VVT controller assembly
(b) Current valve timing is fixed S ECM
WIRING DIAGRAM
ECM
Right Bank OCV
6
1 R-B
E12 OC1+
5
2 L-B
E12 OC1-
Left Bank OCV
29
1 R
E12 OC2+
18
2 R-W
E12 OC2-
A07621 A09776
INSPECTION PROCEDURE
HINT:
S If DTC P1349 is displayed, check right bank VVT system circuit.
S If DTC P1354 is displayed, check left bank VVT system circuit.
S 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.
Author : Date : 277
DI-124
DIAGNOSTICS - ENGINE
TOYOTA hand-held tester:
1 Check valve timing (See page EM-16 ).
NG Repair valve timing.
OK
2 Check operation of OCV.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Connect the TOYOTA hand-held tester and select the VVT from the ACTIVE TEST menu.
CHECK:
Check the engine speed when operate the OCV by the TOYOTA hand-held tester.
OK:
OCV is OFF: Normal engine speed
OCV is ON: Rough idle or engine stall
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
3 Check voltage between terminals OCV+ and OCV- of ECM connector.
OCV Signal Waveform Reference: INSPECTION USING OSCILLOSCOPE
5 V/ Turn the ignition switch ON, and check the waveform between
Division terminals OCV+ and OCV- of the ECM connector.
(A) (A) (A) HINT:
S The correct waveform is as shown.
GND S The waveform frequency (A) is lengthened as the engine
speed becomes higher.
1 m sec./Division NG Check and replace ECM (See page IN-31 ).
A02397
Author : Date : 278
DI-125
DIAGNOSTICS - ENGINE
OK
4 Check VVT controller assembly.
PREPARATION:
(a) Remove the timing belt (See page EM-16 ).
(b) Remove the cylinder head cover.
(c) Remove the OCV (See page EM-33 ).
(d) Drain oil into the VVT controller assembly (See page EM-33 ).
CHECK:
Check whether the oil into VVT controller assembly is drained or not.
OK:
The oil into VVT controller assembly is drained.
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check OCV (See page SF-51 ).
NG Replace OCV, and then go to step 6.
OK
6 Check blockage of OCV, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
Author : Date : 279
DI-126
DIAGNOSTICS - ENGINE
7 Check whether or not DTC P1349/P1354 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3 ).
(b) Perform simulation test.
CHECK:
Check whether or not DTC P1349/P1354 is stored (See page DI-3 ).
OK:
DTC P1349/P1354 is not stored.
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
Replace ECM
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check valve timing (See page EM-16 ).
NG Repair valve timing.
OK
Author : Date : 280
DI-127
DIAGNOSTICS - ENGINE
2 Check operation of OCV.
PREPARATION:
OCV Connector
(a) Start the engine.
CHECK:
(a) Check the engine speed when disconnecting the OCV
connector.
(b) Check the engine speed when applying battery positive
voltage between the terminals of the OCV.
RESULT:
Result Check (a) Check (b)
1 Normal engine speed Rough idle or engine stall
(b) 2 Except 1
A06076
2 Go to step 4.
1
3 Check voltage between terminals OCV+ and OCV- of ECM connector.
OCV Signal Waveform Reference: INSPECTION USING OSCILLOSCOPE
5 V/ Turn the ignition switch ON, check the waveform between termi-
Division nals OCV+ and OCV- of the ECM connector.
(A) (A) (A) HINT:
S The correct waveform is as shown.
GND S The waveform frequency (A) is lengthened as the engine
speed becomes higher.
1 msec./Division
A02397 OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
Author : Date : 281
DI-128
DIAGNOSTICS - ENGINE
Check and replace ECM (See page IN-31 ).
4 Check VVT controller assembly.
PREPARATION:
(a) Remove the timing belt (See page EM-16 ).
(b) Remove the cylinder head cover.
(c) Remove the OCV (See page EM-33 ).
(d) Drain oil into the VVT controller assembly (See page EM-33 ).
CHECK:
Check whether the oil into VVT controller assembly is drained or not.
OK:
The oil into VVT controller assembly is drained.
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check OCV (See page SF-51 ).
NG Replace OCV, and then go to step 6.
OK
6 Check blockage of OCV, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
Author : Date : 282
DI-129
DIAGNOSTICS - ENGINE
7 Check whether or not DTC P1349/P1354 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3 ).
(b) Perform simulation test.
CHECK:
Check whether or not DTC P1349/P1354 is stored (See page DI-3 ).
OK:
DTC P1349/P1354 is not stored.
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
Replace ECM.
Author : Date : 283
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