Mark McConnell
New Member
- Joined
- September 5, 2016
- Messages
- 7
- Reaction score
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- City, State
- Yakima, WA
- Year, Model & Trim Level
- 1993 Aerostar 3.0
The contradictions in tests results below indicate to me there is another factor that prevents an ICM from functioning when receiving the PIP signal during start-up.
(Attempting start-up...AKA, cranking the engine)
All the information I have read explaining how the Black CCD TFI ICM functions indicate it relies on the HAL sensor (PIP or crank sensor) during startup.
If the PIP signal is present and the ICM is good and has a voltage source, what would prevent the ICM from opening and closing the ground connection to the coil's primary?
First posted in July 2015 at fordforums.com
The vehicle:
1993 3.0 Aerostar
108,000 miles
Replaced the fender mounted ICM,(aftermarket & has no name on it) about 7 years ago and have not driven the van more than a half dozen times in the past 2 1/2 years...last driven about a year ago...Street into the driveway.
Current state: Cranks but no spark.
To trouble shoot the no spark issue I followed the instructions on:
Part 1 -How to Test the Ignition Coil (Ford 2.9L, 3.0L, 3.8L)
and
Part 1 -How to Test the Ford Ignition Control Module (Fender Mounted)
I followed all the Parts...
I get to the very last step which uses an LED test light.
Negative lead is connected to the PIP wire at the ICM.
The positive lead connects to Battery +.
I crank the engine and the LED blinks as the engine continues to turn over.
Prognoses: The ICM is bad.
OK.
I have a spare ICM & heatsink. (A motorcraft I picked up the last time I was at the salvage yard)
Lets put that in...and do the LED test...
I crank the engine and the LED does not blink as the engine continues to turn over.
Prognoses: The PIP is bad.
????
This method for testing the Aerostars PIP & ICM seems to be flawed...
...or is it just the owner?
Present day at explorerforum.com
After sitting for a year, I have returned to this headache.
Purchased:
New Distributor, battery, ICM and coil.
Have checked the wires and even bypassed part of the harness for a couple tests.
Current results:
PIP sends its signal to the ICM but the ICM does not appear to open the ground to the coil.
Have checked the ICM plug for continuity and appears to be fine.
ICM has Voltage or that is the plug end has voltage.
The ignition ground circuit checks.
Pin4 is connected to pin4, (ICM to PCM)
Continuity between the coil, distributor and ICM...battery...
In short, the troubleshooting procedure says replace the ICM.
So I bought a new ICM. The other 3 I have tried, (all used) may be bad...
Installed new ICM...
Cranks but no spark
There have been 3 occasions that it sounded like the Thrust I squirted was igniting. All before the new ICM.
Have checked my brain for loose connections...Appears connected due to an ability to write this post....
(Attempting start-up...AKA, cranking the engine)
All the information I have read explaining how the Black CCD TFI ICM functions indicate it relies on the HAL sensor (PIP or crank sensor) during startup.
If the PIP signal is present and the ICM is good and has a voltage source, what would prevent the ICM from opening and closing the ground connection to the coil's primary?
First posted in July 2015 at fordforums.com
The vehicle:
1993 3.0 Aerostar
108,000 miles
Replaced the fender mounted ICM,(aftermarket & has no name on it) about 7 years ago and have not driven the van more than a half dozen times in the past 2 1/2 years...last driven about a year ago...Street into the driveway.
Current state: Cranks but no spark.
To trouble shoot the no spark issue I followed the instructions on:
Part 1 -How to Test the Ignition Coil (Ford 2.9L, 3.0L, 3.8L)
and
Part 1 -How to Test the Ford Ignition Control Module (Fender Mounted)
I followed all the Parts...
I get to the very last step which uses an LED test light.
Negative lead is connected to the PIP wire at the ICM.
The positive lead connects to Battery +.
I crank the engine and the LED blinks as the engine continues to turn over.
Prognoses: The ICM is bad.
OK.
I have a spare ICM & heatsink. (A motorcraft I picked up the last time I was at the salvage yard)
Lets put that in...and do the LED test...
I crank the engine and the LED does not blink as the engine continues to turn over.
Prognoses: The PIP is bad.
????
This method for testing the Aerostars PIP & ICM seems to be flawed...
...or is it just the owner?
Present day at explorerforum.com
After sitting for a year, I have returned to this headache.
Purchased:
New Distributor, battery, ICM and coil.
Have checked the wires and even bypassed part of the harness for a couple tests.
Current results:
PIP sends its signal to the ICM but the ICM does not appear to open the ground to the coil.
Have checked the ICM plug for continuity and appears to be fine.
ICM has Voltage or that is the plug end has voltage.
The ignition ground circuit checks.
Pin4 is connected to pin4, (ICM to PCM)
Continuity between the coil, distributor and ICM...battery...
In short, the troubleshooting procedure says replace the ICM.
So I bought a new ICM. The other 3 I have tried, (all used) may be bad...
Installed new ICM...
Cranks but no spark
There have been 3 occasions that it sounded like the Thrust I squirted was igniting. All before the new ICM.
Have checked my brain for loose connections...Appears connected due to an ability to write this post....