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Topaz Member
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100 Posts
Discussion Starter #1
Well, last week my Service Engine Light came on, and my car developed a hesitation just above idle. I pulled out the trusty Haynes manual to read the codes from the EEC-4 test port. Here are a few troubles that I ran into and some tips that I wanted to share with anyone who tries this procedure them selves.

According to the Haynes Manual, the EEC-IV test port was next to the right strut. Mine was next to the left.

The book states to hook up a jumper wire from Pin2 to the test port. That was OK. It also says to hook up a voltmeter so that you can read the voltage sweeps... each sweep is a number etc. For my car, I didn't really need to hook up the voltmeter because my Service Engine light would flash for each sweep.

Finally, this was the most frustrating part.... the book listed about one hundred or so two digit codes. It took me 4 tries to finally get the codes correctly, I was noticiing a '1' in between each of the codes. When I couldn't get the engine running test to work properly.. I said screw it and took it to my friend who has a code reader. All the codes that were spit out from his reader were three digit codes, all with a 1 in front of them. The reason the running test wouldn't work was because the computer didn't have good control of the idle.. ...

The problem was my MAF had gone bad. He ordered me a brand new part, only charged me 10% over wholesale.. so $155 (compared to $187 retail). My car is running like she should again, much smoother and with a little bit of her oomph restored.
 

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Topaz GS Member
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8 Posts
MAF sensors

Hmmm, I wonder if that could be causin my troubles too. I've been experiencing inconsistant running.. ANd when I ran the code scanner over it (engine running) it gave me the code for not being able to control the idle speed enough. I also know that my car has had a new MAF sensor since it's been owned... hmmmm Wish I could afford to leave it with Ford for a day and have them gimme a big long list of stuff it could use...
 

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Topaz Member
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100 Posts
Discussion Starter #3
Engine off test

Justin -

What codes did you get when you ran the Key Off and the Key On test?

I got 111 for the key off test (system good)

For the key on, I got 156, 158, and 181. The 156 I think was the Fuel Injector Pulse out of range, the 158 was the MAF circuit, and I can't remember what the 181 was. (I'm not 100% sure on these codes, I'll double check when I get home tonight).

Then for the key on I got the 99 code for not able to control idle.
 

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Australian Ford Member
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1,120 Posts
XR5TopazBri said:
I was noticiing a '1' in between each of the codes. When I couldn't get the engine running test to work properly.. I said screw it and took it to my friend who has a code reader. All the codes that were spit out from his reader were three digit codes, all with a 1 in front of them
Hi from Australia. I ended up here searching something else.

There are no pulses for zero in EECIV, so single digits are used for 10, 20 etc and show as 1, 2, etc.

The single pulse representing 10 is a separator code between each of the two digit diagnostic codes, so 115, 127, 131 represents diagnostic codes 15, 27, 31.
 
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