Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg preche

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                                                                                                         DI-3
                                     DIAGNOSTICS     -   ENGINE
                                                                                                        DI00H-21


                                           PRE-CHECK
                                           1.    DIAGNOSIS SYSTEM
                                           (a)   Description
                                                 S    When troubleshooting OBDII vehicles, the only dif-
                                                      ference from the usual troubleshooting procedure
                                                      is that you connect to the vehicle the OBDII scan
                                                      tool complying with SAE J1978 or TOYOTA hand-
                                                      held tester, and read off various data output from
                                                      the vehicle's ECM.

                                                 S     OBDII regulations require that the vehicle's on-
                                                       board computer lights up the Malfunction Indicator
                                                       Lamp (MIL) on the instrument panel when the com-
                                                       puter detects a malfunction in the emission control
                                                       system/components or in the powertrain control
                                                       components which affect vehicle emissions, or a
                                                       malfunction in the computer. In addition to the MIL
                                                       lighting up when a malfunction is detected, the ap-
                                  FI0534               plicable Diagnostic Trouble Code (DTC) prescribed
                                                       by SAE J2012 are recorded in the ECM memory
                                                       (See page DI-14 ).
                                           If the malfunction does not reoccur in 3 consecutive trips, the
                                           MIL goes off automatically but the DTCs remain recorded in the
                                           ECM memory.




              TOYOTA Hand-Held tester            S       To check the DTCs, connect the TOYOTA hand-
                                                         held tester or OBDII scan tool to Data Link Connec-
                                                         tor 3 (DLC3) on the vehicle. The TOYOTA hand-
                                                         held tester or OBDII scan tool also enables you to
                                                         erase the DTCs and check freezed frame data and
                                                         various forms of engine data. (For operating instruc-
                                                         tions, see the OBDII scan tool's instruction book.)
                                                 S       DTCs include SAE controlled codes and manufac-
      DLC3                        I12054                 turer controlled codes. SAE controlled codes must
                                                         be set as prescribed by the SAE, while manufactur-
                                                         er controlled codes can be set freely by the
                                                         manufacturer within the prescribed limits (See DTC
                                                         chart on page DI-14 ).




2002 ECHO (RM884U)

                                                               Author :             Date :              173
DI-4
                      DIAGNOSTICS    -   ENGINE

                                 S     The diagnosis system operates in normal mode
                                       during normal vehicle use. It also has a check mode
                                       for technicians to simulate malfunction symptoms
                                       and troubleshoot. Most DTCs use 2 trip detection
                                       logic* to prevent erroneous detection, and ensure
                                       thorough malfunction detection. By switching the
                                       ECM to check mode when troubleshooting, the
                                       technician can cause the MIL to light up for a mal-
                                       function that is only detected once or momentarily
                                       (TOYOTA hand-held tester only). (See step 2)
                                  S    *2 trip detection logic:
                                       When a malfunction is first detected, the malfunc-
                                       tion is temporarily stored in the ECM memory (1st
                                       trip).
                          If the same malfunction is first detected again during the second
                          drive test, this second detection causes the MIL to light up (2nd
                          trip) (However, the IG switch must be turned OFF between the
                          1st trip and the 2nd trip.).
                                  S    Freeze frame data:
                                       Freeze frame data records the engine condition
                                       when a misfire (DTC P0300 - P0304) or fuel trim
                                       malfunction (DTC P0171) or other malfunction (first
                                       malfunction only), is detected.
                                  S    Because freeze frame data records the engine
                                       conditions (fuel system, calculated load, engine
                                       coolant temperature, fuel trim,engine speed, ve-
                                       hicle speed, etc.) when the malfunction is detected,
                                       when troubleshooting it is useful for determining
                                       whether the vehicle was running or stopped, the en-
                                       gine warmed up or not, the air-fuel ratio lean or rich,
                                       etc. at the time of the malfunction.
                          Priorities for troubleshooting:
                          If troubleshooting priorities for multiple DTCs are given in the
                          applicable DTC chart, these should be followed.
                          If no instructions are given troubleshoot DTCs according to the
                          following priorities.
                                 (1) DTCs other than fuel trim malfunction (DTC P0171,
                                       P0172), and misfire (DTC P0300 - P0304).
                                 (2) Fuel trim malfunction (DTC P0171).
                                 (3) Misfire (DTC P0300 - P0304).




 2002 ECHO (RM884U)

                                                  Author :          Date :               174
                                                                                                               DI-5
                                            DIAGNOSTICS       -   ENGINE

                                                   (b)      Check the DLC3.
                                                            The vehicle's ECM uses ISO 9141-2 for communication.
                                                            The terminal arrangement of DLC3 complies with SAE
                                                            J1962 and matches the ISO 9141-2 format.




                                         N09214




  Terminal No.           Connection / Voltage or Resistance                              Condition
       7                   Bus    Line / Pulse generation                            During transmission
       4             Chassis Ground /  Body Ground 1  or less                              Always
       5             Signal Ground /  Body Ground 1  or less                               Always
      16              Battery Positive /  Body Ground 9 - 14 V                             Always
                                                   HINT:
                                                   If your display shows "UNABLE TO CONNECT TO VEHICLE"
                                                   when you have connected the cable of the TOYOTA hand-held
                                                   tester or OBDII scan tool to DLC3, turned the ignition switch ON
                                                   and operated the scan tool, there is a problem on the vehicle
                                                   side or tool side.
                                                    S    If communication is normal when the tool is connected to
                                                         another vehicle, inspect DLC3 on the original vehicle.
                                                    S    If communication is still not possible when the tool is con-
                                                         nected to another vehicle, the problem is probably in the
                                                         tool itself, so consult the Service Department listed in the
                                                         tool's instruction manual.



                                                   2.       INSPECT DIAGNOSIS (Normal Mode)
                                                   (a)      Check the MIL
                                                            (1) The MIL comes on when the ignition switch is turned
                                                                ON and the engine is not running.
                                                   HINT:
                                                   If the MIL does not light up, troubleshoot the combination meter
                                                   (See page BE-47 ).
                                                          (2) When the engine started, the MIL should go off. If
                                         FI2547                 the lamp remains on, the diagnosis system has de-
                                                                tected a malfunction or abnormality in the system.
                                                   (b) Check the DTC.
                                                   NOTICE:
                                                    S     If there is no DTC in the normal mode, check the 1st
                                                          trip DTC using Continuous Test Result function
                                                          (Mode 7 for SAE J1979) or the TOYOTA hand-held
                                                          tester or OBDII scan tool.




2002 ECHO (RM884U)

                                                                       Author :             Date :             175
DI-6
                      DIAGNOSTICS   -   ENGINE

                           S     TOYOTA hand-held tester only:
                                 When the diagnosis system is switched from normal
                                 mode to check mode, it erases all DTCs and freezed
                                 frame data recorded in normal mode. So before
                                 switching modes, always check the DTCs and
                                 freezed frame data, and note them down.
                                 (1) Prepare the TOYOTA hand-held tester or OBDII
                                       scan tool (complying with SAE J1978).
                                 (2) Connect the TOYOTA hand-held tester or OBDII
                                       scan tool to DLC3 under the instrument panel lower
                                       pad.
                                 (3) Turn the ignition switch ON and turn the TOYOTA
                                       hand-held tester or OBDII scan tool switch ON.
                                 (4) Use the TOYOTA hand-held tester or OBDII scan
                                       tool to check the DTCs and freezed frame data;
                                       note them down. (For operating instructions, see
                                       the OBDII scan tool's instruction book.)
                                 (5) See step 4 to confirm the details of the DTCs.
                          NOTICE:
                           S     When simulating symptoms with an OBDII scan tool
                                 (excluding TOYOTA hand-held tester) to check the
                                 DTCs, use normal mode. For code on the DTC chart
                                 subject to "2 trip detection logic", perform the follow-
                                 ing either action.
                           S     Turn the ignition switch OFF after the symptom is
                                 simulated the first time. Then repeat the simulation
                                 process again. When the problem has been simulated
                                 twice, the MIL lights up and the DTCs are recorded in
                                 the ECM.
                           S     Check the 1st trip DTC using Mode 7 (Continuous Test
                                 Results) for SAE J1979.
                          (c) Clear the DTC.
                                 The DTCs and freezed frame data will be erased by either
                                 action.
                                 (1) Operating the TOYOTA hand-held tester or OBDII
                                       scan tool (complying with SAE J1978) to erase the
                                       codes. (See the OBDII scan tool's instruction book
                                       for operating instructions.)
                                 (2) Disconnecting the battery terminals or EFI fuse.
                          NOTICE:
                          If the TOYOTA hand-held tester switches the ECM from the
                          normal mode to the check mode or vice-versa, or if the
                          ignition switch is turned from ON to ACC or OFF during
                          check mode, the DTCs and freezed frame data will be
                          erased.




 2002 ECHO (RM884U)

                                                 Author :        Date :             176
                                                                                                                                DI-7
                                                      DIAGNOSTICS      -   ENGINE

                                                              3.    INSPECT DIAGNOSIS (Check Mode)
                                                              HINT:
                                                              TOYOTA hand-held tester only:
                                                              Compared to the normal mode, the check mode has an in-
                                                              creased sensitivity to detect malfunctions.
                                                              Furthermore, the same diagnostic items which are detected in
                                                              the normal mode can also be detected in the check mode.
                                                              Check the DTC.
                                                                    (1) Initial conditions:
                                                                          S     Battery positive voltage 11 V or more.
                                                                          S     Throttle valve fully closed.
                                                                          S     Transmission in "P" or "N" position.
                                                                          S     A/C switched OFF.
                                                                    (2) Turn the ignition switch OFF.
                                                                    (3) Prepare the TOYOTA hand-held tester.
                                                                    (4) Connect the TOYOTA hand-held tester to DLC3
                                                                         under the instrument panel lower pad.
                                                                    (5) Turn the ignition switch ON and switch the TOYOTA
                                                                         hand-held tester ON.

                                                                    (6)    Switch the TOYOTA hand-held tester normal mode
                                                                           to check mode (Check that the MIL flashes.).
                                                              NOTICE:
        Flashing                                              If the TOYOTA hand-held tester switches the ECM from the
  ON                                                          normal mode to the check mode or vice-versa, or if the
 OFF
                                                              ignition switch is turned from ON to ACC or LOCK during
                                                              check mode, the DTCs and freezed frame data will be
       0.13 Second                                            erased.
                                                 FI3605              (7) Switch the engine. (The MIL goes out after the en-
                                                                          gine start.)
                                                                     (8) Simulate the conditions of the malfunction de-
                                                                          scribed by the customer.
                                                              NOTICE:
                                                              Leave the ignition switch ON until you have checked the
                                                              DTC, etc.
                                                                     (9) After simulating the malfunction conditions, use the
                                                                          TOYOTA hand-held tester diagnosis selector to
                                                                          check the DTCs and freezed frame data, etc.
                                                              HINT:
                                                              Take care not to turn the ignition switch OFF. Turning the ignition
                                                              switch OFF switches the diagnosis system from check mode to
                                                              normal mode. so all DTCs, etc. are erased.
                                                                     (10) After checking the DTC, inspect the applicable cir-
                                                                          cuit.
4.    FAIL-SAFE CHART
If any of the following codes is recorded, the ECM enters fail-safe mode.
    DTC No.                            Fail-Safe Operation                                  Fail-Safe Deactivation Conditions
     P0100         Ignition timing fixed at 5



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