Thursday, July 5, 2012


Location of Ignition module on Ford Vehicles.

FOR 1995 f150 5.0:

If the  distributor use the TFI module? If so look for a thin (1/2 inch) 4 inch long, inch and a half tall thingy with a plug in the 5 oclockish position.
The module is gray in color and distributor has to be out to replace the Ignition module.

1990/2002 Ford
The owners manual says Ignition module to be mounted to the rear of the left hood hinge on the left fender inner apron.
It costs for about $170.
Aftermarket Ignition module costs about $ 90.

The TFI module is mounted in a heatsink on the fender on all F150s after year 1991. If yours is faulty the only part worth replacing this with is a another Ford part, none of the aftermarket modules last.After market parts are not performance wise.They are cheap but dont last long.


1995 Ford  F-150 4.9L

The ignition module is attached to the driver side sheet metal, in a heat sink bracket with aluminum cooling fins, just below where the hood hinge attaches to the sheet metal. It's held on by two hex head screws.

1993 Ford Festiva 4 cylinder

The ignition module is located by your coil. This unit has the switching transistor in it.

See location for the ignition module:
ford ignition module image

Procedure to test ignition coil :---
If the electrical connectors of Ignition coil are wet,then first dry them.Clean them with soft cloth.Then using a test light,check for power at the positive side of the coil,with the key on.
If this is ok,back probe the negative side of the coil with the test light and have someone else crank the engine. Watch the test light,it should flash or at least flicker on and off. If not,the switching transistor in the module may be blown.If it does,it may be a bad coil.

NOW, if the test light plugged in on the negative side of the coil is not flickering (flashing) when you crank it,the transistor could be open.
Crank the engine and watch your check engine light on the dash.Key on,the light should be on.During cranking,it should go off. This is a quick check of the crank sensor.
If the light stays on,you will need to replace it.
The Crank sensor is located in the distributor.Also,if the crank sensor is bad,it will not allow the transistor in the ignition module to open and close.

Ford 97 F350

Symptoms of faulty ignition module:

Car will not start.Or it will start but not completely turn over and run.Or no spark problem.

The ignition control modules are common for failure in such cases.There are also other possibilities like faulty distributor or issue with ignition coil or faulty crank sensor.

On 1997 F350 the Ignition Control Module is located at the LH rear of engine compartment, on fender apron...most parts stores can test them...

see the diagram shown below for its location:---

ignition module diagram

On some cases its seen/noticed that When ignition module gets weak.At that time it stops when it gets warm or engine gets warm and starts working when everything gets cool.In that case also ignition module has to be replaced.These is the start indication that ignition module is about to fail.


1987 ford ranger

Replace ignition coil but still no spark,its faulty ignition module.

The usual suspect on your 2.9 for a loss of spark is caused by a failed Ignition module and not the coil, when replacing the module (mounted on the distributor) its also a good idea to replace the stator inside the distributor at the same time. The distributor has to be remove to replace the stator.
Ignition module is pointed with red arrow:---
See the help diagram shown below:----

distributor & stator assembly

To remove the screws you will need a 5.5 thin wall metric socket , they also sell a special tool for it for about $8.00 .Start with the Ignition module and if its still has a problem, replace the stator.

1990 ford e350

The ignition module Location diagram is shown below:---

ignition module diagram


1996 Ford f-150

Vehicle cranks,misfires and stalls

Check power to ignition coil.It should have power.
If no power then there is a problem.
But if it has power then check the ground signal,here is the procedure to see if its getting a ground signal trigger.
You will need a  test light.Its easily available at local auto part sore or electrical parts store.Hook it up backwards. Hook the alligator clip of the test light and hook it to battery positive, and take the tip of the test light and touch it the signal wire of the coil. The test light should blink when cranking over the engine if its getting a signal. If you use a conventional test light, it will flicker very very dim (so look closely) if the coil is getting a signal to fire the spark.

If the ignition coil is getting battery voltage and a ground signal trigger to fire the spark and is not firing any spark out while cranking the engine over, the ignition coil is bad and will need to be replaced.

If the ignition coil is not getting a ground signal trigger to fire the spark, then either the PCM or the ignition module is going to be at fault. Just be sure to check the inputs before replacing either of them.

see the wiring diagram shown below:---

ford wiring diagram

If all checked ok,then it can be problem with crank sensor itself.
You could have a bad cam or crank sensor. To check them all you have to do is turn the key on and crank. The check engine light should normally come on when the key is turned to the on position, then go off when cranking. The computer turns off the check engine light when it recognizes the crank signal. So if there is a bad crank sensor, the computer will never turn off the check engine light when cranking! If thats the case its time to replace the sensor! Just be sure the wiring is in good shape.If the wires are loose or dirty,then try cleaning the connections and refit it properly and see all works good or not.

Also on this year vehicle, the crank sensor is only used to detect misfires. Engine only needs the signal in the distributor to start and run. If the signal is not getting to engine the crank issues will be noticed.

You can verify this by disconnecting the crank sensor and checking to see if the engine fires up or not.

1992 Ford Escort
Has power to coil but no Spark at spark plugs

It can be faulty crank sensor or issue with ignition module or a loose timing belt,or timing belt out of alignment or broken timing belt.

In this cases first try common test procedure.This test is signal test.
Does the check engine light come on when the key is turned to on and go out when cranking?

If the check engine light comes on and goes out that means  engine rpm signal is coming there to tell the module to fire the coil.But may be module is not doing its job.The ignition module needs testing.

what is there is ignition module?
The Electronic Distributorless Ignition System (EDIS) , consists of a
  • Variable Reluctance Sensor (VRS) , 
  • an EDIS Module, 
  • an EEC IV processor and one 4-tower Coil Pack. 
This system operates by sending crankshaft position information from the VRS to the EDIS module. 
  • The module generates a PIP signal and sends it to the EEC IV processor. 
  • The processor responds with a Spark Angle Word (SAW) signal containing advance or retard timing information back to the EDIS module.
  •  The module processes VRS and SAW signals and decides which coils to fire. 
  • In addition, the module generates an Ignition Diagnostic Monitor (IDM) signal to processor which is used to indicate a failure mode and also provide a tach output signal.
See the help diagram shown below:---

ford IGM distributor diagram

ON ford Escort Dual Cam 1.8L engine  the crankshaft position sensor is inside the distributor itself and as long as the check engine light goes out then the engine control module is receiving an engine rpm signal which should have the ECM tell the Ignition module to fire the coil.

On dual cam 1.8L Ignition module is Located under the coil on its mounting bracket:
See the help diagram shown below:----

ford escort IGM


1995 Ford Mustang

Ignition module replacing procedure and Location diagram

Ignition Control Module

Procedure to remove
  1. Disconnect engine control sensor wiring connector from ignition control module (ICM) (12A297 see diagram below) .
  2. Remove screws retaining heatsink/ ignition control module to front fender apron (16055) .
  3. Remove two screws retaining ignition control module to heatsink and remove ignition control module .

Procedure to Install
  1. Coat metal baseplate of ignition control module uniformly with silicone compound, approximately 0.79 mm (1/32 inch) thick. 
  2. Use Silicone Dielectric Compound D7AZ-19A331-A (Motorcraft WA-10) or equivalent meeting Ford specification ESE-M1C171-A.Its easily available at parts stores.
  3. Once this is done .Now position ignition control module onto heatsink and tighten two retaining screws to 1.7-4.0 Nm (15-35 lb-in).
  4. After that Install ignition control module /heatsink to RH front fender apron . Tighten retaining screws to 10.2-13.8 Nm (90-120 lb-in).
  5. Connect engine control sensor wiring (12A581) to the ignition control module.
  6. Test its working to confirm that installation is done right.
  7. In some rare cases new parts too comes faulty.So check the part quality before installation.But branded parts,that has minor chances of coming faulty,then local Aftermarket parts.
See the help diagram shown below:----

ignition module ford


1995 Ford Bronco 302 Engine
No spark issues
First test and  find out if it has spark or not. When it acts up and quits, pull the coil wire off the coil (big center one). Crank the engine over, if there is a good spark there consistent, then the ignition system works.
To test Remove the coil wire from the coil. This is the wire that goes from the coil to the center of the dist.
If the spark test good then its timing issue or fuel issue.
Also make sure that the rotor under the dist cap is turning consistently. If it stops and then turns, then the dist gear could be worn away and will need to be replaced. So lets make sure the dist rotor is turning.On some cases this issue was also noticed.
In such cases most likely part that fails is the TFI ignition module either located on the side of the dist or remotely located on the fender inner. Looks similar to below.

See the image of Ignition module
ignition module part

This details will help.

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