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DI-122
DIAGNOSTICS - ENGINE
DI6VL-04
DTC P1349 VVT System Malfunction
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
S Valve timing
warmed up and engine speed at 400 4,000 rpm :
S Oil control valve
P1349 (a) Valve timing does not change from of current valve
S VVT controller assembly
timing
S ECM
(b) Current valve timing is fixed.
WIRING DIAGRAM
ECM
C18
Oil Control Valve
10
R-W
E7 OCV+
2
23
R-B
E7 OCV-
1
A09060
INSPECTION PROCEDURE
HINT:
S If DTC P1349 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 warmed up or not, the air-fuel
ratio lean or rich, etc. at the time of the malfunction.
Author : Date : 292
DI-123
DIAGNOSTICS - ENGINE
TOYOTA hand-held tester
1 Check valve timing (See page EM-20 ).
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 VVT from 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.*
*: DTC P1349 is also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns 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 : 293
DI-124
DIAGNOSTICS - ENGINE
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 waveform between terminals
Division 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
A02397 NG Check and replace ECM (See page IN-29 ).
OK
4 Check VVT controller assembly (See page EM-32 ).
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check oil control valve (See page SF-45 ).
NG Replace oil control valve, and then go to step 6.
OK
6 Check blockage of oil control valve, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
Author : Date : 294
DI-125
DIAGNOSTICS - ENGINE
7 Check whether or not DTC P1349 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3 ).
(b) Perform simulation test.
CHECK:
Check whether or not DTC P1349 is stored (See page DI-3 ).
OK:
DTC P1349 is not stored
OK VVT system is OK.*
*: DTC P1349 is also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns 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 (See page IN-29 ).
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check valve timing (See page EM-20 ).
NG Repair valve timing.
OK
Author : Date : 295
DI-126
DIAGNOSTICS - ENGINE
2 Check operation of OCV.
(a) PREPARATION:
Start the engine.
CHECK:
(a) Check the engine speed when disconnect the OCV con-
nector.
(b) Check the engine speed when apply battery positive volt-
age between terminals of OCV.
RESULT:
OCV Connector
Result Check (a) Check (b)
(b) 1 Normal engine speed Rough idle or engine stall
2 Except 1
A09111 2 Go to step 4.
A0911 A09114
2
1
Author : Date : 296
DI-127
DIAGNOSTICS - ENGINE
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 waveform between terminals
Division 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
A02397 OK VVT system is OK.*
*: DTC P1349 is also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns 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
Check and replace ECM (See page IN-29 ).
4 Check VVT controller assembly (See page EM-32 ).
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check oil control valve (See page SF-45 ).
NG Replace oil control valve, and then go to step 6.
OK
Author : Date : 297
DI-128
DIAGNOSTICS - ENGINE
6 Check blockage of oil control valve, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
7 Check whether or not DTC P1349 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3 ).
(b) Perform simulation test.
CHECK:
Check whether or not DTC P1349 is stored (See page DI-3 ).
OK:
DTC P1349 is not stored
OK VVT system is OK.*
*: DTC P1349 is also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns 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
Check and replace ECM (See page IN-29 ).
Author : Date : 298
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