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cip1656


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DI-134
                                                     DIAGNOSTICS   -   ENGINE
                                                                                                                          DI6VO-04




    DTC                 P1656                 OCV Circuit Malfunction

CIRCUIT DESCRIPTION
Refer to DTC P1349 (VVT System Malfunction) on page DI-122 .
   DTC No.                        DTC Detecting Condition                                             Trouble Area
                                                                           S Open or short in oil control valve circuit
   P1656
              Open or short in oil control valve circuit                   S Oil control valve
   P1663
                                                                           S ECM


WIRING DIAGRAM
Refer to DTC P1349 (VVT System Malfunction) on page DI-122 for the WIRING DIAGRAM.

INSPECTION PROCEDURE
HINT:
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.
TOYOTA hand-held tester

   1       Check OCV circuit.

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:
    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




 2002 ECHO (RM884U)

                                                                                Author :                     Date :         304
                                                                                               DI-135
                                     DIAGNOSTICS   -   ENGINE



   2      Check operation of OCV.

         START                             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:
BE6653                                         Rough idle or engine stalled.
A09112                            A09115



                                             NG        Replace OCV.


  OK



   3      Check voltage between terminals OCV+ and OCV- of ECM connector
          (See page DI-122 ).


                                             NG        Check and replace ECM (See page IN-29 ).


  OK



   4      Check for open and short in harness and connector between OCV and ECM
          (See page IN-29 ).


                                             NG        Repair or replace.


  OK



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




2002 ECHO (RM884U)

                                                             Author :         Date :              305
DI-136
                                      DIAGNOSTICS   -   ENGINE

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

   1      Check operation of OCV.

         START                              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:
BE6653                                          Rough idle or engine stalled
A09112                             A09115



                                              NG        Replace OCV.


  OK



   2      Check voltage between terminals OCV+ and OCV- of ECM connector
          (See page DI-122 ).


                                              NG        Check and replace ECM (See page IN-29 ).


  OK



   3      Check for open and short in harness and connector between OCV and ECM
          (See page IN-29 ).


                                              NG        Repair or replace.


  OK



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




2002 ECHO (RM884U)

                                                                 Author :       Date :             306



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