DTC P0505 IDLE CONTROL SYSTEM MALFUNCTION by gdf57j

VIEWS: 51 PAGES: 3

									05–264
                                                     DIAGNOSTICS       –       SFI SYSTEM (2ZZ–GE)                                 057I4–03




    DTC                   P0505               IDLE CONTROL SYSTEM MALFUNCTION

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


Signal
          ECM

                  Valve               To Cylinder
                           ISC Valve
                                                  A58697



   DTC No.                         DTC Detecting Condition                                                    Trouble Area
                                                                                    S PCV hose
                                                                                    S Open or short in ISC valve circuit
                                                                                    S ISC valve is stuck or closed
    P0505       Idle speed continues to be apart greatly from target speed
                                                                                    S Open or short in A/C switch circuit
                                                                                    S Air induction system
                                                                                    S ECM

WIRING DIAGRAM



                                                       IAC Valve
                                                                                                                             ECM
 From
 Terminal 3 of                                                                                                   5
                                 B            2                            1               B–L
                                                    VISC       DUTY                                             E3     RSD
 E.F.I. Relay



                                                                        B         C
                                                                    3                                    W–B
                                                                GND     J4        J3
                                                                    W–B
                                                                         Junction
                                                                                                           ED
                                                                         Connector


                                                                                                                                    A63944




INSPECTION PROCEDURE
HINT:
Read freed frame data using hand–held tester. Because freeze frame records the engine conditions when
the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was run-
ning or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc. at the time of the malfunction.

 2003 COROLLA MATRIX (RM940U)

                                                                                       Author :                      Date :          464
                                                                                                     05–265
                                             DIAGNOSTICS   –   SFI SYSTEM (2ZZ–GE)

      1      PERFORM ACTIVE TEST BY OBD II SCAN TOOL OR HAND–HELD
             TESTER(CHECK OPERATION OF THE ISC VALVE)

(a)       Warm up the engine to the normal operating temperature.
(b)       Switch off all the accessories.
(c)       Switch off the A/C.
(d)       Shift the lever into the neutral position.
(e)       Connect the hand–held tester or OBD II scan tool to the DLC3 on the vehicle.
(f)       Check the difference of the engine speed in less than 5 seconds and more than 5 seconds.
          Difference of engine speed: More than 100 rpm.
                                                     OK        CHECK FOR INTERMITTENT PROBLEMS

      NG

      2      CHECK CONNECTION OF PCV HOSE

                                                     NG        REPAIR OR REPLACE PCV HOSE

      OK

      3      CHECK HARNESS AND CONNECTOR

                                                   (a)   Disconnect the ISC valve connector.
                                                   (b)   Turn the ignition switch ON.
                                                   (c)   Measure voltage between terminals +B and E01 of the
                                                         ISC valve connector.
                                                         Voltage: 9 – 14 V
                    1   2   3



              +B (+) RSO        E01 (–)              OK        REPAIR OR         REPLACE   HARNESS    AND
                                          A65759
                                                               CONNECTOR

      NG




 2003 COROLLA MATRIX (RM940U)

                                                                     Author :         Date :           465
05–266
                                       DIAGNOSTICS   –   SFI SYSTEM (2ZZ–GE)

   4     CHECK HARNESS AND CONNECTOR(RSO CIRCUIT)

                                             (a)   Disconnect the ECM E3 connector.
                                             (b)   Check continuity between the terminals RSO of the ECM
                                                   connector and RSO of the ISC valve connector.
                                                   Resistance: 1 Ω or less
                                             (c)   Check for short between the terminals RSO of the ECM
                                                   connector and GND of the ISC valve connector.
                    RSO                            Resistance: 1 MΩ or more

                                    A65743




                1    2    3



           +B       RSO       E01
                                    A65760     NG        REPAIR OR         REPLACE   HARNESS      AND
                                                         CONNECTOR

  OK

   5     INSPECT THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY
          (See page 10–12)

                                               NG        REPLACE THLOTTLE BODY IDLE SPEED
                                                         CONTROL VALVE ASSY

  OK

 CHECK AND REPLACE ECM




2003 COROLLA MATRIX (RM940U)

                                                                Author :         Date :            466

								
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