Signals, Interfaces and Shields

Ignition Module And Coils Replacement:

Ignition Schematic:

PURPOSE
The electronic ignition system controls fuel combustion by providing a spark to ignite the compressed air/fuel mixture at the correct time. To provide optimum engine performance, fuel economy, and control of exhaust emissions, the PCM controls spark advance of the ignition system.

COMPONENTS
The ignition system consists of:
- Four ignition coils.
- Two crankshaft sensors ("A" and "B").
- Crankshaft reluctor ring.
- Camshaft position sensor.
- Ignition Control (IC) module.
- Spark plugs and wires.
- Knock Sensor (KS).


OPERATION
In this ignition system, neither end of the secondary winding is grounded. Instead, each end of a coil's secondary winding is attached to a spark plug. Each cylinder is paired with an opposite cylinder.

The PCM controls spark advance and fuel injection for all driving conditions. The PCM monitors input signals from the following components as part of its ignition control funtion to determine the required ignition timing and relay the information to the IC module for spark control.
- Ignition control module
- Engine Coolant Temperature (ECT).
- Manifold Absolute Pressure (MAP) sensor.
- Transaxle Range (TR) switch.
- Throttle Position (TP) sensor.
- Knock Sensor (KS).


LOCATION
Top RH rear of engine under ignition coils.