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TFI issue? Best way to test?

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

TFI issue? Best way to test?

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Old 08-22-2007, 11:29 PM
  #1  
sennasixty8
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Default TFI issue? Best way to test?

Total newb question, but I want to test my TFI module, and read some posts about checking resistance values.

Do I need to remove it to make it easier, or test in on the car (motor off)?

I've got a mid to part throttle "miss" that only happens when the motors fully warmed up, and driving it EASY. Otherwise, the WOT response is perfect, as well as the idle.
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Old 08-22-2007, 11:33 PM
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primetime5.0
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Default RE: TFI issue? Best way to test?

you can take it to autozone and have it tested, I had a similar problem it turned out to be the o2's
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Old 08-22-2007, 11:36 PM
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sennasixty8
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Default RE: TFI issue? Best way to test?

ORIGINAL: primetime5.0

you can take it to autozone and have it tested, I had a similar problem it turned out to be the o2's
Did you pull the thing off, or leave it on, and drive up to the store for testing? Did they pull the codes for ya?
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Old 08-22-2007, 11:37 PM
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mattdel
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Default RE: TFI issue? Best way to test?

A = Ground
B = PIP Power, Profile Ignition Pickup Power. Powers the Hall Sensor in conjunction with terminal A .
C = PIP IN, Ignition signal picked up via the Hall sensor sent to the TFI module.
1 = PIP, Profile Ignition Pickup. PIP signals the EEC of the crankshaft position.
2 = SPOUT, Spark Output Signal from the EEC module. This is how EEC controls your timing.
3 = START, Battery voltage input with ignition switch in start position.
4 = TFI PWR, Battery voltage input with ignition switch in run position.
5 = TACH (IDM), Tachometer, Ignition Diagnostic Monitor, Switched output to ignition coil.
6 = IGN GND, Ground. The following is a comparison made between two modules, one with 100k miles and a relatively brand new module (A2A). PINS EXPECTED VALUES A1A(100kmiles usage) A2A (10miles usage) % diff
NOTE: 14.26kohms = 14,260ohms
A to C > 500ohms 14.26kohm14.15kohm -0.77%
B to C < 2,000ohms 1.112kohm 1.115kohm +0.27%
B to 4< 200ohms 84.7ohm 86.1ohm +1.65%
A to 6< 2ohms 0.0ohm 0.0ohm0.0%
C to 1< 200ohms 101.2ohm100.8ohm -0.40%

[IMG]local://upfiles/53364/E181DD9140764B0E809397E838762A18.jpg[/IMG]
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Old 08-22-2007, 11:39 PM
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primetime5.0
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Default RE: TFI issue? Best way to test?

I just took it off and had them test it, they said they couldnt pull codes, for that you'll to do a koer test
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