Ignition Control Module location on 1995 Lincoln?

[Gerald Bennett]

Where would the Ignition Control Module be located on a 1995 Lincoln Town Car? 4.6 engine w/ AC

[Towncar]

Originally Posted by Gerald Bennett

Where would the Ignition Control Module be located on a 1995 Lincoln Town Car? 4.6 engine w/ AC

Long story made short, there is none on this car.

Short story made long:

Overview

The Ignition System is designed to ignite the compressed air/fuel mixture supplied to the engine by the fuel and air systems. The ignition system also provides engine timing information to the Powertrain Control Module (PCM) for proper vehicle operation.


Integrated Electronic Ignition System (High Data Rate)

The Integrated Electronic Ignition (EI) system consists of a PCM, a Crankshaft Position Sensor (CKP) and connecting wiring harnesses. The PCM contains the ignition control hardware for Profile Ignition Pickup (PIP), Spark Output (SPOUT), Ignition Ground (IGN GND), and Ignition Diagnostic Monitor (IDM). Six cylinder applications use a six tower coil pack. Eight cylinder and dual plug applications use two four tower coil packs. Four cylinder applications use a single four tower coil pack.

The 3.4L Taurus SHO uses coil per plug, which has one coil for each of the eight cylinders. Also, the 3.4L Taurus SHO uses a Camshaft Position Sensor (CMP) for identification of cylinder one.

The EI High Data Rate system eliminates the need for a distributor by using multiple coil packs. Each coil within the pack fires two spark plugs at the same time. The plugs are paired so that as one fires during the compression stroke, the other fires during the exhaust stroke. The next time the coil is fired, the plug that was on exhaust will be on compression and the plug that was on compression will be on exhaust.

The coil on plug works in the same manner as a standard coil pack. The coil on plug systems fire only one spark plug at a time instead of two like the standard coil packs. Since there is one coil on each spark plug, the coils will fire the spark plugs on the compression stroke only. Coils no longer fire spark plugs on the exhaust stroke. The PCM uses information from the CMP to identify the position of cylinder one in order to synchronize the firing of the coils.

The CKP is used to indicate crankshaft position and speed information to the PCM. By sensing a missing tooth on a trigger wheel mounted on the crankshaft damper, the CKP is also able to identify a specific point in the travel of piston 1. The PCM uses the information from the CKP to generate an internal Profile Ignition Pickup (PIP) signal.

Once the PIP signal is generated, fuel and spark functions are enabled. The calculated spark target is used internally by the PCM as a pulse width modulated digital signal called the Spark Output (SPOUT). The PCM decodes the SPOUT signal and fires the next spark at the commanded spark target. The PIP signal is also used to supply a clean, inverted signal (PIP) for tachometer operation.

The PCM also serves as an electric switch for a coil primary circuit. When the switch closes, current flows and a magnetic field expands around the primary coil. When the switch opens, the field collapses and causes the secondary coil to fire the spark plugs at high voltage. In addition, an Ignition Diagnostic Monitor (IDM) signal is transmitted on each spark firing. This signal communicates information by pulse width modulation.


Electronic Ignition System (High Data Rate)

The 3.0L Windstar is the only EI system to use a stand alone Ignition Control Module (ICM). The 3.0L Windstar also uses a CKP, PCM, connecting wiring harness and a six tower coil pack. The operation of this system is almost identical to the Integrated Electronic Ignition System.

In the Electronic Ignition System, the CKP is used to indicate crankshaft position and speed information to the ICM. By sensing a missing tooth on a trigger wheel mounted on the crankshaft damper, the CKP is also able to identify a specific point in the travel of piston one. The ICM uses this information from the CKP to generate a Profile Ignition Pickup (PIP) signal that is sent to the PCM.

Once the PCM recognizes the PIP signal, fuel and spark functions are enabled. The calculated spark target is sent from the PCM to the ICM as a pulse width modulated digital signal called the Spark Output (SPOUT). The ICM decodes the SPOUT signal and fires the next spark at the commanded spark target.

By energizing the primary side of the coils on proper sequence and connecting the secondary wires in accordance with the engine firing order, a power stroke is achieved on each cylinder. In addition, an Ignition Diagnostic Monitor (IDM) signal is transmitted on each spark firing. This signal communicates information by pulse width modulation and provides a clean, buffered signal with a frequency proportional to engine speed for tachometer operation.

The ICM also serves as an electric switch for a coil primary circuit. When the switch closes, current flows and a magnetic field expands around the primary coil. When the switch opens, the field collapses and causes the secondary coil to fire the spark plugs at high voltage.

[rhandwor]

If you aren't getting spark unplug the crankshaft position sensor and a ohm meter should go from 0 to 1 as somebody is cranking the engine,also check the crankshaft position sensor the same way if the camshaft sensor is good.