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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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