Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip1656p

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                                                                                                                     DI-137
                                                     DIAGNOSTICS   -   ENGINE
                                                                                                                      DI6TC-03




     DTC                 P1656                 OCV Circuit Malfunction (bank 1)


     DTC                 P1663                 OCV Circuit Malfunction (bank 2)

CIRCUIT DESCRIPTION
Refer to DTC P1349, P1354 on page DI-123 .
    DTC No.                        DTC Detecting Condition                                          Trouble Area
                                                                           S Open or short in OCV circuit
    P1656
               Open or short in oil control valve circuit                  S OCV
    P1663
                                                                           S ECM


WIRING DIAGRAM
Refer to DTC P1349, P1354 on page DI-123 .

INSPECTION PROCEDURE
HINT:
S       If DTC P1656 displayed, check right bank OCV circuit.
S       If DTC P1663 displayed, check left bank OCV 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.
TOYOTA hand-held tester:

    1       Check OCV circuit.

PREPARATION:
(a) Start the engine and warm 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:
    VVT system is OFF (OCV is OFF): Normal engine speed
    VVT system is ON (OCV is ON): Rough idle or engine stalled

                                                             OK        Check for intermittent problems
                                                                       (See page DI-3 ).


    NG




                                                                             Author :                       Date :    291
DI-138
                                    DIAGNOSTICS   -   ENGINE



   2      Check operation of OCV.

                                        PREPARATION:
                                        (a) Start the engine and warmed it up.
                                        (b) Disconnect the OCV connector.
                                        (c) Apply battery positive voltage between terminals of the
                                            OCV.
                                        CHECK:
                                        Check the engine speed.
                                        OK:
 A06076                        A11891       Rough idle or engine stalled.

                                          NG          Replace OCV.


   OK



   3      Check voltage between terminals OCV+ and OCV- of ECM connector (See page
          DI-123 ).


                                          NG          Check and replace ECM (See page IN-31 ).


   OK



   4      Check for open and short in harness and connector between OCV and ECM (See
          page IN-31 ).


                                          NG          Repair or replace.


   OK



  Check for intermittent problems (See page
  DI-3 ).




                                                               Author :       Date :             292
                                                                                             DI-139
                                    DIAGNOSTICS   -   ENGINE

OBD II scan tool (excluding TOYOTA hand-held tester):

   1      Check operation of OCV.

                                        PREPARATION:
                                        (a) Start the engine and warmed it up.
                                        (b) Disconnect the OCV connector.
                                        (c) Apply battery positive voltage between terminals of the
                                            OCV.
                                        CHECK:
                                        Check the engine speed.
                                        OK:
 A06076                        A11891       Rough idle or engine stalled

                                           NG         Replace OCV.


   OK



   2      Check voltage between terminals OCV+ and OCV- of ECM connector (See page
          DI-123 ).


                                           NG         Check and replace ECM (See page IN-31 ).


   OK



   3      Check for open and short in harness and connector between OCV and ECM (See
          page IN-31 ).


                                           NG         Repair or replace.


   OK



 Check for intermittent problems (See page
 DI-3 ).




                                                            Author :         Date :              293

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