GENERAL INFORMATION


<134, 3A9>


This system is equipped with three ignition coils with built-in power transistors for each of the cylinders.
Interruption of the primary current flowing in the primary side of an ignition coil generates a high voltage in the secondary side of ignition coil. The high voltage thus generated is applied to the spark plugs to generate sparks. The engine-ECU turns the power transistors inside the ignition coils alternately on and off. This causes the primary currents in the ignition coils to be alternately interrupted and allowed to flow to fire the cylinders in the order 1-3-2.
The engine-ECU determines which ignition coil should be controlled by means of the signals from the camshaft position sensor and the crank angle sensor. It also detects the crankshaft position, in order to provide ignition at the most appropriate timing in response to the engine operation conditions.
When the engine is cold or running at high altitudes, the ignition timing is slightly advanced to provide optimum performance. Furthermore, if knocking occurs, the ignition timing is gradually retarded until knocking ceases.

SYSTEM DIAGRAM




IGNITION COIL SPECIFICATION


Item
 Specification
Type
 Moulded 3-coil

SPARK PLUG SPECIFICATIONS


Item
 Specification
134
 BOSCH
 FR7SE <Nickel plug>
FR7NPP33 <Platinum plug>
3A9
 NGK
 LZFR5BI11 <Iridium plug>

<135, 4A9, 4G1>


This system is equipped with four ignition coils with built-in power transistors for each of the cylinders.
Interruption of the primary current flowing in the primary side of an ignition coil generates a high voltage in the secondary side of ignition coil. The high voltage thus generated is applied to the spark plugs to generate sparks. The engine-ECU or engine automated manual transmission electronic control unit (engine-A-M/T-ECU) turns the power transistors inside the ignition coils alternately on and off. This causes the primary currents in the ignition coils to be alternately interrupted and allowed to flow to fire the cylinders in the order 1-3-4-2.
The engine-ECU or engine-A-M/T-ECU determines which ignition coil should be controlled by means of the signals from the camshaft position sensor and the crank angle sensor. It also detects the crankshaft position, in order to provide ignition at the most appropriate timing in response to the engine operation conditions.
When the engine is cold or running at high altitudes, the ignition timing is slightly advanced to provide optimum performance. Furthermore, if knocking occurs, the ignition timing is gradually retarded until knocking ceases.

SYSTEM DIAGRAM




IGNITION COIL SPECIFICATION


Item
 Specification
Type
 Moulded 4-coil

SPARK PLUG SPECIFICATIONS


Item
 Specification
135
 BOSCH
 FR7SE <Nickel plug>
FR7NPP33 <Platinum plug>
4A9
 NGK
 LZFR6BI11 <Iridium plug>
4G1
 NGK
 ILZFR6C-K <Iridium plug>