Honda - Accord Prelude 1996 2000

General Information

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Beginning in 2000, the Accord equipped with the 3.0L V6 engine uses a distributorless ignition system. The ignition timing and the ignition advance are both controlled by the Powertrain Control Module (PCM) to match the driving conditions. The PCM optimizes the ignition timing using input from a collection of sensors. The ignition timing can be checked for diagnostic purposes, although it cannot be adjusted. The distributorless ignition system uses one ignition coil per cylinder, unlike the distributor type system that uses one ignition coil for the entire system and uses the distributor to dispense the high-voltage ignition to the spark plugs.

The distributorless ignition system, which uses individual ignition coils, operates on the same principle as those on the distributor-equipped engines. However, instead of the distributor's rotation being used to trigger the ignition coil, the PCM controls the switching of the current through the primary windings for each of the individual ignition coils. When current to the ignition coil is stopped, a high voltage current flows directly from the ignition coil to the spark plug.

The PCM contains the memory for basic ignition timing for different engine speeds and manifold airflow rates. The PCM also adjusts the ignition timing according to engine coolant temperature. The Cylinder Position (CYP) Sensor is used by the PCM to monitor the crankshaft speed. A misfire is detected by the PCM if the crankshaft speed fluctuates.

The following sensors are used by the PCM for ignition timing control:



Top Dead Center (TDC) sensors. These two sensors, TDC1 and TDC2, determine ignition timing during start up and when the crank angle is abnormal
 
Cylinder Position (CYP) sensor. This sensor detects engine speed
 
Manifold Absolute Pressure (MAP) sensor. This sensor detects the intake manifold air volume
 
Engine Coolant Temperature (ECT) sensor. This sensor monitors the engine coolant temperature
 
Knock Sensor (KS). Allows the PCM to adjust ignition timing for the octane rating of the gasoline being used
 

 
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