Toyota Celica 2005 Repair Manual page 386

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 displayed, check the No.1 ignition coil with igniter circuit.
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If DTC P0352 is displayed, check the No.2 ignition coil with igniter circuit.
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If DTC P0353 is displayed, check the No.3 ignition coil with igniter circuit.
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If DTC P0354 is displayed, 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 is a 1−cylinder ignition system which ignites one cylinder with one ignition coil. In the 1−cylinder
ignition system, one spark plug is connected to the end of the secondary winding. High−voltage is generated
in the secondary winding and 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 signals (IGTs) for each cylinder. Using the
IGT, the ECM turns on and off the power transistor inside the igniter, which switches on and off of current
to the primary coil. When current 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 create sparks inside the cylinders. As the ECM cuts the
current to the primary coil, the igniter sends back the ignition confirmation signal (IGF) for each cylinder igni-
tion to the ECM.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (1ZZ−FE)
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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DI−187
DIC6W−02