Sfi System (For Sedan) Diagnosis System

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

  1. DESCRIPTION

  1. NORMAL MODE AND CHECK MODE

  1. 2 TRIP DETECTION LOGIC

  1. FREEZE FRAME DATA

  1. DLC3 (Data Link Connector 3)

  1. BATTERY VOLTAGE

  1. MIL (Malfunction Indicator Lamp)

  1. ALL READINESS

Sfi System (For Sedan) -- Diagnosis System



DESCRIPTION
  1. When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1987) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can be then read.

  1. Yaris. Ncp93, 131
    OBD II regulations require that the vehicle's on-board computer illuminate the MIL (Malfunction Indicator Lamp) on the instrument panel when the computer detects a malfunction in:
    1. The emission control system components.
    2. The powertrain control components (which affect vehicle emissions).
    3. The computer itself.
  1. In addition, the applicable DTCs prescribed by SAE J2012 are stored in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain stored in the ECM memory.
  1. To check the DTCs, connect the Techstream to the DLC3. The Techstream displays output DTCs, freeze frame data, and a variety of engine data. The DTCs and freeze frame data can be cleared with the Techstream (YARIS_NCP93 RM000000PDK0QGX.html).
    In order to enhance OBD function on vehicles and develop the Off-Board diagnosis system, Controller Area Network (CAN) communication is used in this system. CAN is a network which uses a pair of data transmission lines spanning multiple computers and sensors. It allows for high speed communications between the systems and simplification of the wire harness connections.

NORMAL MODE AND CHECK MODE
The diagnosis system operates in normal mode during normal vehicle use. In normal mode, 2 trip detection logic is used to ensure accurate detection of malfunctions. Check mode is also available as an option for technicians. In check mode, 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (Techstream only) (YARIS_NCP93 RM000000PDL0J3X.html).

2 TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the next subsequent drive cycle, the MIL is illuminated (2nd trip).

FREEZE FRAME DATA
Freeze frame data records the engine conditions (fuel system, calculated engine load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

DLC3 (Data Link Connector 3)

  1. Check the DLC3 (YARIS_NCP93 RM000000UZ209YX.html).


BATTERY VOLTAGE
If the voltage is below 11 V, replace or recharge the battery before proceeding
Standard voltage:
11 to 14 V

MIL (Malfunction Indicator Lamp)

  1. The MIL is illuminated when the ignition switch is first turned to ON (the engine is not running).

  2. The MIL should turn off when the engine is started. If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.

    HINT:
    If the MIL is not illuminated when the ignition switch is first turned to ON, check the MIL circuit (YARIS_NCP93 RM000000WZ10O2X.html).

ALL READINESS
HINT:
  1. With All Readiness you can check whether or not the DTC judgment has been completed by using the Techstream.
  2. You should check All Readiness after simulating malfunction symptoms or for validation after finishing repairs.

  1. Connect the Techstream to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the Techstream on.

  4. Clear DTCs (YARIS_NCP93 RM000000PDK0QGX.html).

  5. Turn the ignition switch off and wait for at least 30 seconds.

  6. Turn the ignition switch to ON and turn the Techstream on.

  7. Perform the DTC judgment driving pattern to run the DTC judgment.

  8. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  9. Input the DTCs to be confirmed.

  10. Check the DTC judgment result.

    Techstream
    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit