Toyota Corolla Quiz
Diagnostics

Inspection procedure

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
18steps
~108min
4/5difficulty
Done 0 of 18
Hint

: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc. At the time of the malfunction.

 1 Perform simulation test
  1. Clear the dtc
  2. shuffle arrangement of the ignition coil and igniters.
Notice

: do not shuffle the connectors.
  • perform the simulation test.

    • Result:

    2 Inspect ecm(igt1, igt2, igt3, igt4 and igf signal)
    2 Inspect ecm(igt1, igt2, igt3, igt4 and igf signal)
    Toyota Corolla. Inspect ecm
    1. Inspection using the oscilloscope.
    2. during cranking or idling, check the waveform between terminals igt1 to igt4 and e1, igf and e1 of the ecm connector.

    Standard:

    Hint:
    Hint

    : correct waveform is as shown in the diagram on the left.
    Toyota Corolla. Inspect ecm
    3 Check harness and connector(ignition coil assy – ecm)
    3 Check harness and connector(ignition coil assy – ecm)
    Toyota Corolla. Check harness and connector
    1. Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
    2. disconnect the e3 ecm connector.
    3. check the resistance between the wire harness side connectors.

    Standard (check for open):

    Standard (check for open):

    Standard (check for open):

    Standard (check for short):

    Standard (check for short):

    Standard (check for short):

    Standard (check for short):

    Toyota Corolla. Check harness and connector
    1. Reconnect the ecm connector.
    2. reconnect the ignition coil and igniter connector
      4 Inspect ignition coil assy(power source)
    4 Inspect ignition coil assy(power source)
    Toyota Corolla. Inspect ignition coil assy
    1. Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
    2. check the resistance between the wire harness side connectors.

    Standard (check for open):

    1. Turn the ignition switch on position.
    2. measure the voltage between the terminal of the wire harness side connector and body ground.

    Standard:

    1. Reconnect the ignition coil and igniter connector.
    5 Check harness and connector(ignition coil assy – ignition switch)
    5 Check harness and connector(ignition coil assy – ignition switch)
    Toyota Corolla. Check harness and connector
    1. Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
    2. disconnect the i10 ignition switch connector.
    3. check the resistance between the wire harness side connectors.

    Standard (check for open):

    Standard (check for short):

    Standard (check for short):

    Toyota Corolla. Check harness and connector
    1. Reconnect the ignition coil and igniter connector.
    2. reconnect the ignition switch connector.
      Replace ignition coil assy
    Replace ignition coil assy

    Test yourself

    A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.