See Figures 1, 2, 3 and 4
Tauruses with 3.0L and 3.2L SHO engines are equipped with an Electronic Ignition (EI) system previously known as the Distributorless Ignition System (DIS). As the name implies, there is no conventional distributor assembly in the engine. This system consists of:
A Crankshaft Position sensor (CKP sensor, formerly crankshaft timing sensor) that is a single Hall effect magnetic switch, which is activated by three vanes on the crankshaft timing pulley. The signal generated by this sensor is called Crankshaft Position (CKP). The CKP signal provides base timing and crankshaft speed (rpm) information to the Ignition Control Module (ICM) and the Powertrain Control Module (PCM).
Fig. Fig. 1: Crankshaft position sensor-SHO vehicles
A Camshaft Position sensor (CMP sensor) that is a single Hall effect magnetic switch also, but is activated by a single vane driven by the camshaft. This sensor provides camshaft rotational location information to the PCM. The Ignition Control Module (ICM) uses a Camshaft Position (CMP) signal for ignition coil fire sequencing. The PCM also uses the CMP signal for fuel injector synchronization.
Fig. Fig. 2: Camshaft position sensor mounting-SHO vehicles
An ignition coil that houses the spark plug wires like the convention distributor cap. The ignition "coil'' actually contains three separate ignition coils. Each coil is controlled by the Ignition Control Module (ICM) through three coil leads. Each ignition coil activates two spark plugs simultaneously, one on the compression stroke (this uses the majority of the ignition coil's energy) and one on the exhaust stroke (this uses very little of the ignition coil's stored energy).
Fig. Fig. 3: An ignition coil houses the spark plug wires like a conventional distributor cap
An Ignition Control Module (ICM) which receives the CKP signal from the CKP sensor. During normal operation, the CKP signal is sent to the PCM from the CKP sensor and provides base ignition timing and RPM information. The ICM receives the CMP signal from CMP sensor, providing the ICM with the information required to synchronize the ignition coils in the proper sequence. It also receives the Spark Output (SPOUT) from the PCM. The SPOUT signal contains the optimum spark timing and dwell information.
Fig. Fig. 4: The ignition control module is mounted to the engine air inlet connector
3.0L FLEXIBLE FUEL (FF) VEHICLES
See Figures 5, 6 and 7
The 3.0L Flexible Fuel Taurus is equipped with an ignition system that is very similar to that of the 3.0/3.2L SHO vehicles. The main difference is the crankshaft position sensor. The system includes:
A Crankshaft Position sensor (CKP sensor) which is a variable reluctance sensor triggered by a "36-minus-1'' tooth trigger wheel located on the crankshaft pulley and damper. The signal generated from the CKP sensor is called the Crankshaft Position signal (CKP signal). This signal provides base timing and crankshaft speed (rpm) information to the Ignition Control Module (ICM). The ICM uses this information with the spark advance information from the PCM to determine ignition coil ON and OFF time.
Fig. Fig. 5: Location of the crankshaft position sensor-3.0L FF engine
An ignition "coil'' which is mounted to the rear of the left-hand cylinder head. It actually contains three separate ignition coils. Each ignition coil is controlled by the ignition control module through three coil leads. Each ignition coil activates two spark plugs simultaneously, one on the compression stroke (this plug uses the majority of the ignition coil's energy) and one on the exhaust stroke (this plug uses very little of the ignition coil's stored energy).
Fig. Fig. 6: The spark plug wire numbers are marked on the ignition coil towers
An Ignition Coil Module (ICM) which is located on the dash panel in the engine compartment. It receives engine position and speed information from the CKP sensor, and desired spark advance information from the PCM. The ignition module uses this information to determine which ignition coil to fire, calculating the ON and OFF times of the ignition coils required to achieve the correct dwell and spark advance. It outputs a Profile Ignition Pickup (PIP) signal and an Ignition Diagnostic Monitor (IDM) signal for use by the PCM. It also sends information on system failures through the IDM signal to the PCM, stores information for use during diagnostic test mode, and provides the signal for the tachometer.
Fig. Fig. 7: The ignition control module is located on the dash panel in the engine compartment