Description
Hint:
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.
Reference: inspection using an oscilloscope.
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.
Monitor description
If the ecm does not receive any igf signals despite transmitting the igt signal, it interprets this as a fault in the igniter and sets a dtc.
If the malfunction is not repaired successfully, a dtc is set 1 second after the engine is next started.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Wiring diagram
Inspection procedure
Hint:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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.
Standard resistance (check for open)
Standard voltage
Standard
resistance (check for open)
Standard resistance (check for open)
Standard resistance (check for short)
Standard resistance (check for short)
Notice:
Do not shuffle the connectors.
Components (2005/11-2006/01)
Sliding roof ecu power source circuit
Description
If the sliding function and tilt function do not operate, there may be a
malfunction in the sliding roof ecu
power source circuit.
Wiring diagram
Inspection procedure
Perform active test by i ...
Front occupant classification sensor lh collision detection
Description
Dtc b1785 is output when the occupant classification ecu receives a collision
detection signal sent by
the front occupant classification sensor lh when an accident occurs.
Dtc b1785 is also output when the front seat rh is subjected to a strong impact,
even if an actual
acc ...
Removal
Remove radiator support opening cover
Remove front wheel rh
Remove front fender apron rh
Remove front suspension member
reinforcement rh
Remove the 4 bolts and reinforcement rh.
Remove fan and generator v belt
Using sst and 19 mm socket wrench, loosen the vribbed
belt ...