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cip0505


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DI-106
                                                    DIAGNOSTICS        -     ENGINE
                                                                                                                               DI6VH-02




    DTC                  P0505                Idle Control System Malfunction

CIRCUIT DESCRIPTION
                                                           The rotary solenoid type IAC valve is located on the throttle
                                       Intake Air          body and intake air bypassing the throttle valve is directed to
            Throttle Valve             Chamber             the IAC valve through a passage.
                                                           In this way the intake air volume bypassing the throttle valve is
From                                                       regulated, controlling the engine speed.
Air                                                        The ECM operates only the IAC valve to perform idle-up and
Cleaner                                                    provide feedback for the target idling speed.

 Signal
          ECM

                Valve                  To Cylinder
                          IAC Valve

                                                 P01559




  DTC No.                          DTC Detecting Condition                                          Trouble AreaTrouble Area
                                                                                 S IAC valve is stuck or closed
                                                                                 S Open or short in IAC valve circuit
                Idle speed continues to vary greatly from the target speed       S Open or short in A/C switch circuit
   P0505
                (2 trip detection logic)                                         S Air induction system
                                                                                 S ECM
                                                                                 S PCV piping




2002 ECHO (RM884U)

                                                                                      Author :                   Date :          276
                                                                                                                          DI-107
                                                    DIAGNOSTICS    -     ENGINE

WIRING DIAGRAM
             I10 Ignition   Instrument Panel J/B
             Switch
        W-R             B-R    6           3
            5 AM2 IG2 6       1O          1A

   1O 1                                                                                                            ECM
               Instrument                                          B-R
               Panel J/B
                                      B-Y
   1A 7                   Engine
                          Room
        W-R               R/B No. 1
    1                 1                              1     1
         2                2
                                                    1          5
         AM2              EFI
                                            EFI
         1                                  Relay
                          1
                                                    2          3                  I1
    1                                                                             IAC Valve
     B-L                                                                                                  2
                                                     1     1                                      B-R        RSD
 2 F6                                                                                                     E7
                                                                                              1
               Fussible                                                 4
        MAIN
                                                                           B-Y                    BR
               Link Block                      W-B                     EB1
                                                            B-Y               2               3

                                                                                                                    EO1
         Battery
                                                     EC                                             EB

             A09138                                                                                                        A18878




2002 ECHO (RM884U)

                                                                              Author :                   Date :            277
DI-108
                                        DIAGNOSTICS   -   ENGINE

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.

   1     Check engine idle speed.

PREPARATION:
(a) Warm up engine to normal operating temperature.
(b) Switch off all accessories.
(c) Switch off alr conditioning.
(d) Shift transmission into "N" or neutral position.
(e) Connect the TOYOTA hand-held tester to DLC3 on the vehicle.
(f) Select ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Make note of the engine RPM before, and 5 seconds after the TOYOTA hand-held tester active test is turned
ON.
OK:
    Difference of engine speed: More than 100 rpm.

                                                OK        Go to step 7.


   NG



   2     Check connection of PCV piping.


                                                NG        Repair or replace PCV piping.


   OK




 2002 ECHO (RM884U)

                                                                   Author :          Date :              278
                                                                                              DI-109
                                     DIAGNOSTICS   -   ENGINE



  3        Check voltage between terminals RSD of ECM connector and body ground.

       ON             RSD                  PREPARATION:
                                           (a) Remove the connector cover from the ECM.
                                           (b) Disconnect the E7 connector of ECM.
                                           (c) Turn the ignition switch ON.
                                           CHECK:
      E7                                   Measure voltage between terminals RSD of the ECM connector
                     (+)    (-)
                                           and body ground,
                                           OK:
                                  A09042        Voltage: 9 - 14 V

                                             OK        Go to step 5.


  NG



  4        Check IAC valve (See page SF-37 ).


                                             NG        Replace IAC valve.


  OK



 Check for open and short in harness and
 connector between engine room J/B No.2
 and IAC valve and ECM (See page IN-29 ).



  5        Check operation of the IAC valve (See page SF-37 ).


                                             NG        Repair or replace IAC valve.


  OK




2002 ECHO (RM884U)

                                                             Author :          Date :           279
DI-1 10
                                   DIAGNOSTICS   -   ENGINE



   6      Check the blockage of IAC valve and the passage to bypass the throttle valve.


                                         NG          Repair or replace IAC valve.


   OK



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



   7      Check for A/C signal circuit (See page AC-88 ).


                                         NG          Repair or replace.


   OK



  Check air induction system
  (See page SF-1 ).




 2002 ECHO (RM884U)

                                                              Author :        Date :      280



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