Toyota Celica 2005 Repair Manual page 685

DI−486
DTC P0351
DTC P0352
DTC P0353
DTC P0354
HINT:
These DTCs indicate a malfunction related to the primary circuit.
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If DTC P0351 is present, check the No. 1 ignition coil with igniter circuit.
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If DTC P0352 is present, check the No. 2 ignition coil with igniter circuit.
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If DTC P0353 is present, check the No. 3 ignition coil with igniter circuit.
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If DTC P0354 is present, check the No. 4 ignition coil with igniter circuit.
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CIRCUIT DESCRIPTION
A Direct Ignition System (DIS) is used on this vehicle. The DIS improves the ignition timing accuracy, reduces
high−voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 1−cylinder ignition system which ignites one cylinder with one ignition coil. In the 1−cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug passes from the
center electrode to the ground electrode.
The ECM determines the ignition timing and outputs the ignition (IGT) signals for each cylinder. Using the
IGT signal, the ECM turns on and off the power transistor inside the igniter and this switches on and off of
the current to the primary coil. When the current flow to the primary coil is cut off, high−voltage is generated
in the secondary coil and this voltage is applied to the spark plugs to spark inside the cylinders. As the ECM
cuts the current to the primary coil, the igniter sends back the ignition confirmation (IGF) signal for each cylin-
der ignition to the ECM.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (2ZZ−GE)
Igniter Coil "A" Primary/Secondary Circuit
Igniter Coil "B" Primary/Secondary Circuit
Igniter Coil "C" Primary/Secondary Circuit
Igniter Coil "D" Primary/Secondary Circuit
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DIC7J−02