Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Ignition coil primary/secondary
circuit / Inspection procedure
Toyota Corolla (E120): Inspection procedure
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
- Clear the dtc
- 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)
- Inspection using the oscilloscope.
- during cranking or idling, check the waveform between terminals igt1 to igt4 and e1, igf and e1 of the ecm connector.
Standard:
Hint
: correct waveform is as shown in the diagram on the left.
3 Check harness and connector(ignition coil assy – ecm)
- Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
- disconnect the e3 ecm connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):
Standard (check for open):
Standard (check for short):
Standard (check for short):
- Reconnect the ecm connector.
- reconnect the ignition coil and igniter connector
4 Inspect ignition coil assy(power source)
- Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):
- Turn the ignition switch on position.
- measure the voltage between the terminal of the wire harness side connector and body ground.
Standard:
- Reconnect the ignition coil and igniter connector.
5 Check harness and connector(ignition coil assy – ignition switch)
- Disconnect the i2, i3, i4 or i5 ignition coil and igniter connector.
- disconnect the i10 ignition switch connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):
Standard (check for short):
- Reconnect the ignition coil and igniter connector.
- reconnect the ignition switch connector.
Replace ignition coil assy
Other materials:
Circuit description
The shift solenoid valve sl is turned ”on” and ”off” by signals from the ecm
in order to control the hydraulic
pressure operation, the lock–up relay valve, which then the controls operation
of the lock–up clutch.
Fail safe function:
if the ecm detects a malfunction, it turns the ...
Overhaul
1. Precaution
2. Disconnect battery negative terminal
3. Inspect place front wheels facing straight ahead
4. Remove horn button assy
Notice:
if the airbag connector is disconnected with the ignition
switch being at on, dtcs will be recorded.
using a torx socket wrench, loosen the ...
Interior
SRS airbags
Floor mats
Front seats
Head restraints
Seat belts
Console box
Inside lock buttons
Cup holders
Rear seats
Rear seat heater switches*
*: If equipped
■Ceiling
Inside rear view mirror
Sun visors
Vanity mirrors
Vanity lights*
Interior lights/personal lights
Moon roof sw ...