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cip1600


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DI-132
                                                      DIAGNOSTICS      -   ENGINE
                                                                                                                              DI6VN-04




    DTC                      P1600               ECM BATT Malfunction

CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air-fuel ratio adaptive control value memory, etc.

   DTC No.                             DTC Detecting Condition                                        Trouble Area
                                                                               S Open in back up power source circuit
   P1600           Open in back up power source circuit
                                                                               S ECM

HINT:
If DTC P1600 appear, the ECM does not store another DTC.

WIRING DIAGRAM

                                                                                                                        ECM
                                                                                    13                       1
                                 B-Y                                 B-Y                        B-Y                  BATT
                                                                                    ID3                      E4

                                                          1                   Engine Room
               1             Engine Room                                      R/B No. 1
                             R/B No. 1
                                                      5          1
                   2
                                                                     EFI
                   EFI                                               Relay

                   1                                  3       2

               1
         B-L

               F6 2
                         Fusible
                MAIN     Link Block




                       Battery


                                                                                                                              A09061




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.


 2002 ECHO (RM884U)

                                                                                    Author :                 Date :             302
                                                                                                DI-133
                                     DIAGNOSTICS   -   ENGINE



  1     Check voltage between terminal BATT of ECM connector and body ground.

       LOCK                                PREPARATION:
                           BATT
                                           Remove the connector cover from the ECM.
                                           CHECK:
                                           Measure voltage between terminal BATT of the ECM connector
                                           and body ground.
                                           OK:
                     (-)    (+)                 Voltage 9 - 14 V

                                  A09050     OK        Check and replace ECM (See page IN-29 ).


  NG



  2     Check EFI fuse.

          Engine Room R/B No. 1            PREPARATION:
                                           Remove the EFI fuse from the engine room J/B.
                                           CHECK:
                                           Check continuity of EFI fuse.
                                           OK:
                                               Continuity

                                             NG        Check for short in all the harness and
   EFI Fuse                       B07780
                                                       components connected to EFI fuse.


  OK



 Check and repair harness or connector
 between battery and EFI fuse and ECM
 (See page IN-29 ).




2002 ECHO (RM884U)

                                                             Author :           Date :            303



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