Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Inspect ignition coil assembly (power source)

  5. Check harness and connector (ignition coil assembly - ecm)

  6. Check whether dtc output recurs (dtc p0351, p0352, p0353 or p0354)

DTC P0351 Ignition Coil "A" Primary / Secondary Circuit

DTC P0352 Ignition Coil "B" Primary / Secondary Circuit

DTC P0353 Ignition Coil "C" Primary / Secondary Circuit

DTC P0354 Ignition Coil "D" Primary / Secondary Circuit

HINT:
  1. These DTCs indicate malfunctions relating to the primary circuit.
  2. If DTC P0351 is set, check No. 1 ignition coil with igniter circuit.
  3. If DTC P0352 is set, check No. 2 ignition coil with igniter circuit.
  4. If DTC P0353 is set, check No. 3 ignition coil with igniter circuit.
  5. If DTC P0354 is set, check No. 4 ignition coil with igniter circuit.

DESCRIPTION

A Direct Ignition System (DIS) is used on this vehicle.
The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The sparks of the spark plugs pass from the center electrode to the ground electrodes.
The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the ECM, for each cylinder ignition.

Ignition system Yaris


DTC No.
DTC Detection Conditions
Trouble Areas
P0351
P0352
P0353
P0354
No IGF signal to ECM while engine running
(1 trip detection logic)
  1. Ignition system
  2. Open or short in IGF1 or IGT circuit (1 to 4) between ignition coil with igniter and ECM
  3. No. 1 to No. 4 ignition coils with igniters
  4. ECM

  1. Reference: Inspection using an oscilloscope. Yaris
  2. Reference: Inspection using an oscilloscope.
  3. While cranking or idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.
    Items
    		Contents
    Terminals
    		CH1: IGT1, IGT2, IGT3, IGT4 - E1
    CH2: IGF1 - E1
    Equipment Settings
    		2 V/Division, 20 msec./Division
    Conditions
    		Cranking or idling

WIRING DIAGRAM


Disconnect the C11, C12, C13 or C14 ignition coil with igniter connector. Yaris


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. Freeze frame data records the engine conditions 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.
1.INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
Disconnect the C11, C12, C13 or C14 ignition coil with igniter connector. Yaris

  1. Disconnect the C11, C12, C13 or C14 ignition coil with igniter connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    GND (C11-4) - Body ground
    		Below 1 Ω
    GND (C12-4) - Body ground
    GND (C13-4) - Body ground
    GND (C14-4) - Body ground

  1. Turn the ignition switch to ON.

  1. Measure the voltage between the terminals of the wire harness side connector.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    +B (C11-1) - GND (C11-4)
    		9 to 14 V
    +B (C12-1) - GND (C12-4)
    +B (C13-1) - GND (C13-4)
    +B (C14-1) - GND (C14-4)

  1. Reconnect the ignition coil with igniter connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

2.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)
Disconnect the C11, C12, C13 or C14 ignition coil with igniter connector. Yaris

  1. Disconnect the C11, C12, C13 or C14 ignition coil with igniter connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    IGF (C11-2) - IGF1 (C20-81)
    		Below 1 Ω
    IGF (C12-2) - IGF1 (C20-81)
    IGF (C13-2) - IGF1 (C20-81)
    IGF (C14-2) - IGF1 (C20-81)
    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    IGT1 (C11-3) - IGT1 (C20-85)
    		Below 1 Ω
    IGT2 (C12-3) - IGT2 (C20-84)
    IGT3 (C13-3) - IGT3 (C20-83)
    IGT4 (C14-3) - IGT4 (C20-82)
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    IGF (C11-2) or IGF1 (C20-81) - Body ground
    		10 kΩ or higher
    IGF (C12-2) or IGF1 (C20-81) - Body ground
    IGF (C13-2) or IGF1 (C20-81) - Body ground
    IGF (C14-2) or IGF1 (C20-81) - Body ground
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    IGT1 (C11-3) or IGT1 (C20-85) - Body ground
    		10 kΩ or higher
    IGT2 (C12-3) or IGT2 (C20-84) - Body ground
    IGT3 (C13-3) or IGT3 (C20-83) - Body ground
    IGT4 (C14-3) or IGT4 (C20-82) - Body ground

  1. Reconnect the ECM connector.

  1. Reconnect the ignition coil with igniter connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).

    NOTICE:
    Do not shuffle the connectors.

  1. Perform a simulation test.

  1. Check DTCs displayed on the tester.

    Result:
    Display (DTC Output)
    		Proceed To
    Same DTC output
    		A
    Different ignition coil DTC output
    		B


Bnext
REPLACE IGNITION COIL ASSEMBLY (Click here)
A
next down
REPLACE ECM (Click here)