Electronic Engine Control - IV Pin diagram

[aemiller]

Can someone please point me to (or post) the pin diagram for a 1990 2.9l Ranger EEC. I'm getting the check engine light with a 67 error code. My mechanic loaned me his breakout box. I'm having trouble finding the pin diagram I need to make the diagnosis. Thank you!

 

[waterran]

Can someone please point me to (or post) the pin diagram for a 1990 2.9l Ranger EEC. I'm getting the check engine light with a 67 error code. My mechanic loaned me his breakout box. I'm having trouble finding the pin diagram I need to make the diagnosis. Thank you!

Hello, I have a factory PCM pinout diagram for my 1992 R10...Ranger.

 

[RonD]

Welcome to TRS

67 is a Neutral switch code
Do you have a manual or automatic transmission?

Manual uses a Clutch pedal switch
Automatic uses an NSS switch on the drivers side of transmission above shifter

This is a generic EEC-IV wiring guide: http://www.auto-diagnostics.info/ford_eec_iv

Pin 30 is used for "neutral" or "in gear"

"In neutral" would limit RPMs to 3,000

And problem with "neutral" switch could also cause a No Crank situation, it prevents "starting in gear" so has a few functions

 

[aemiller]

The problem is solved!!! And thank you for your replies.

I discovered this morning that my 2.9l has two engine coolant temp sensors. One connects to the gage in the dash. That one was working - and was working even before I installed a new engine coolant temp sensor in it, trying to fix a problem that did not exist.

The second temp sensor is located down under the air throttle and difficult to see. That one goes to pin 7 on the EEC. Once I found it this morning, I could see that the connector was unplugged. When I plugged that back in the check engine light disappeared and the engine is now starting and sounding much better.

FYI - it is a manual transmission. Even though it was showing a 67 neutral safety switch code, it still runs. Now that there is no check engine light, I'm inclined to think that the 67 was a false code.

 

[aemiller]

OK - in trying to edit my post, I ended up with two. Is it possible to delete one?

 

[Paulos]

I believe the code 67 is due to pulling the codes with the manual trans in gear.
I'm not sure about deleting a post.

 

[aemiller]

I believe the code 67 is due to pulling the codes with the manual trans in gear.
I'm not sure about deleting a post.

That's helpful. Thank you!

 

[RonD]

Good work

Yes, all fuel injection engines have 2 temp units
12volt temp sender for dash temp gauge(used on all engines since day one)
5volt ECT sensor for computer that runs the fuel injection(computer needed a more sensitive temp reading)

When Ford switched Rangers to a Digital dash in 2004 only the 5volt ECT sensor was needed/used

Yes, code 67 was not an "action" code you need to deal with in this instance

 

[aemiller]

Thank you, Ron, for that info.