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Author Topic: How to Test the TFI Module and Hall Effect/PIP Sensor  (Read 27430 times)
El Hombre
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« on: April 19, 2007, 08:54:53 am »

Click Please


'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2

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4 Banger
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« Reply #1 on: March 17, 2010, 12:12:32 pm »

Sometimes checking voltages at module connector while it is in its no start state helps narrow the cause down. I use the following steps, all checks are with a straight pin pushed into harness side of TFI connector along side the wire to make contact with the terminals while  still connected and neg lead of meter on neg batt post KOEO.

1 Check for spark. No spark go to 2, got spark Check fuel pressure.

2 With Digital voltmeter check ICM PWR for batt volts. See diagram at http://sbftech.com/index.php/topic,593.0.html 

3 Check Coil - for battery volts, No voltage at coil- with voltage OK at ICM PWR means open coil or wiring between coil and TFI. If volts are OK crank engine and volts should fluctuate as module grounds and ungrounds coil, this is the one this that a incandescent test lamp is safe to be used on and is easier to see coil being fired ( lamp flashes w/ good sig from TFI)

4 check IGN GND for .5 volts or lower with engine cranking, lower is better higher = bad ground.

5 Check PIP while bumping engine in small increments or turning by hand, voltage should go from close to 0v to close to battery as shutter wheel in distributor passes through PIP /Hall sensor . If no good unplug SPOUT and try again. If voltage changes properly PIP sensor is usually OK.

6 By far the most common problem is no sig to fire coil at COIL- , cause is bad TFI if all other tests are have good results.

4 Banger
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« Reply #2 on: March 17, 2010, 12:14:59 pm »

Oops, I was actually trying to reply to

  http://sbftech.com/index.php/topic,24712.msg247396.html#msg247396  .

My apologies J
4 Banger
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« Reply #3 on: March 17, 2010, 12:17:00 pm »

 please move if possible.
Thank you
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