1988 F150 302 no timing advance
Cargo Master
Joined: Jun 2013
Posts: 3,174
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From: Somewhere n North America
See attached;
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
I suggest you try it this way if the 5v is present;
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Junior User
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I will do it this way, I am assuming I just count the meter bumbs? I do have an analog meter thankfully.
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Junior User
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Could the PCM still start the truck but not advance the timing? Like a partial failure.
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
If you remove your EECM, photo what you see inside, also photo all the numbers, letters and code on the outside. If you need to get another, that information will help, plus you want to capture in the case it is original. You will lose that info if you surrender your EECM as a core. There is the possibility that the EECM is not original to the truck, so there could be an issue there.
Take a look for a calibration code on the valve covers or driver’s door pillar for something like; 8-53F-R10
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
Like the Default 10deg the TFI/ICM uses if there is no SpOut present...
The truck starts using the 10 deg, then the Spout signal supplied by the EECM is modified depending on other sensor inputs to the EECM. Then the spout signal leading edge is compared to the PIP signal and the Timing adjustment is made as adjusted output to the coil switching.
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
You could use a 12 volt light as well.
Checking it at the ODB1 connector postpones troubleshooting the CEL path.
Seems, from memory, when that light stays lit, you have a failure in the EECM.
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Junior User
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Photos and video are always good, sometimes the lads will spot something.
If you remove your EECM, photo what you see inside, also photo all the numbers, letters and code on the outside. If you need to get another, that information will help, plus you want to capture in the case it is original. You will lose that info if you surrender your EECM as a core. There is the possibility that the EECM is not original to the truck, so there could be an issue there.
Take a look for a calibration code on the valve covers or driver’s door pillar for something like; 8-53F-R10
If you remove your EECM, photo what you see inside, also photo all the numbers, letters and code on the outside. If you need to get another, that information will help, plus you want to capture in the case it is original. You will lose that info if you surrender your EECM as a core. There is the possibility that the EECM is not original to the truck, so there could be an issue there.
Take a look for a calibration code on the valve covers or driver’s door pillar for something like; 8-53F-R10
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Junior User
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I will pull the codes on Monday and report back, thank you.
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Junior User
Joined: Mar 2014
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Yes. There is some design in the EECM to help you get home in some cases...
Like the Default 10deg the TFI/ICM uses if there is no SpOut present...
The truck starts using the 10 deg, then the Spout signal supplied by the EECM is modified depending on other sensor inputs to the EECM. Then the spout signal leading edge is compared to the PIP signal and the Timing adjustment is made as adjusted output to the coil switching.
Like the Default 10deg the TFI/ICM uses if there is no SpOut present...
The truck starts using the 10 deg, then the Spout signal supplied by the EECM is modified depending on other sensor inputs to the EECM. Then the spout signal leading edge is compared to the PIP signal and the Timing adjustment is made as adjusted output to the coil switching.
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
Ideally a square wave shown in this attachment. Ignore the wire colors. follow the PIP from the TFI to the EECM, and the Spout from the EECM to the TFI.
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
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Junior User
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Great information there, thank you. So essentially, if I can prove that the TFI is outputting a square wave to the EECM via the SPOUT connecter and the timing is not changing then that concludes something is wrong with the EECM?
Cargo Master
Joined: Jun 2013
Posts: 3,174
Likes: 15
From: Somewhere n North America
The TFI outputs the PIP square wave to the EECM pin 56.
The EECM pin 36 outputs the Spout square wave via the Spout Connector back to the TFI. If this is not happening, then it is usually an issue with the EECM. Most likely the 5v power supply capacitors.