Check Engine Codes
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Mountain Pass
Joined: May 2004
Posts: 101
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From: GARLAND, TX
Check Engine Codes
HELP! 1993 F250, 5.8, 5 speed
Ck Eng light is coming on after warm up. Went to www.fordfuelinjection.com and learned how to do the "Key On Engine Off" self-test.
Got the following codes:
172 - This shows to be a "Key On Engine Running" code, so I'm not sure why I got this one. But the definition is "HEGO circuit indicates system lean (right side)" So what is HEGO? Is my fuel system running lean on rt side? How do I correct?
327 - Definition "DPFE or EVP circuit below minimum voltage of 0.2 volts." OK, I give up, what is DPFE and/or EVP, and how do I correct this?
328 - Definition "EVP circuit below minimum voltage of .24 volts." Huh?
I would appreciate any help. Thanks
Ck Eng light is coming on after warm up. Went to www.fordfuelinjection.com and learned how to do the "Key On Engine Off" self-test.
Got the following codes:
172 - This shows to be a "Key On Engine Running" code, so I'm not sure why I got this one. But the definition is "HEGO circuit indicates system lean (right side)" So what is HEGO? Is my fuel system running lean on rt side? How do I correct?
327 - Definition "DPFE or EVP circuit below minimum voltage of 0.2 volts." OK, I give up, what is DPFE and/or EVP, and how do I correct this?
328 - Definition "EVP circuit below minimum voltage of .24 volts." Huh?
I would appreciate any help. Thanks
Posting Guru
Joined: Jun 2004
Posts: 1,781
Likes: 1
From: Central NY
Doesn't the 93 give 2 digit codes?
It doesn't appear that you counted correctly. Did you remember that there is a single seperator blink between koeo and cm codes?
Hope this helps: http://fordfuelinjection.com/?p=13
It doesn't appear that you counted correctly. Did you remember that there is a single seperator blink between koeo and cm codes?
Hope this helps: http://fordfuelinjection.com/?p=13
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
[QUOTE=Popa Tim]Doesn't the 93 give 2 digit codes?
It doesn't appear that you counted correctly. Did you remember that there is a single seperator blink between koeo and cm codes?
Hope this helps: http://fordfuelinjection.com/?p=13[/QUOTE]
Was not 1993 the year they changed from the EEC to PCM?
The EEC had two digit codes and the PCM has the three digit codes for the transmission and also controls the transmission where the EEC did not.
Did not mean to hijack the thread but was just wondering. I think they also started using the PSOM in 1993 or am I a year off and it was 1992?
It doesn't appear that you counted correctly. Did you remember that there is a single seperator blink between koeo and cm codes?
Hope this helps: http://fordfuelinjection.com/?p=13[/QUOTE]
Was not 1993 the year they changed from the EEC to PCM?
The EEC had two digit codes and the PCM has the three digit codes for the transmission and also controls the transmission where the EEC did not.
Did not mean to hijack the thread but was just wondering. I think they also started using the PSOM in 1993 or am I a year off and it was 1992?
Thread Starter
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Mountain Pass
Joined: May 2004
Posts: 101
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From: GARLAND, TX
I ran the test several times and I'm fairly certain that I was getting 3 digit codes.
But I'm still not sure what the codes are telling me.
But I'm still not sure what the codes are telling me.
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Senior User
Joined: Jun 2004
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From: Florida
EVP - EGR valve postion sensor. Check that first. Its on top of the EGR valve attached to the upper intake manifold passenger side. HEGO i believe has to do with the solenoids near the coil for emissions, but its been awhile and i cant think right now. Hopefully someone can check me here.
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Fleet Owner
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From: Easton,Ks
Originally Posted by thomadm
EVP - EGR valve postion sensor. Check that first. Its on top of the EGR valve attached to the upper intake manifold passenger side. HEGO i believe has to do with the solenoids near the coil for emissions, but its been awhile and i cant think right now. Hopefully someone can check me here.
They are mounted on the Exhaust Header pipes ahead of the cat.
You take them out and burn the soot off with a propane torch and put them back in and they are good to go again, or so I am told (or read somewhere), I have not tried this myself.
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Mountain Pass
Joined: May 2004
Posts: 101
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From: GARLAND, TX
Thanks for the input. I was just reading in my Haynes Book about how to Circuit Test the EVP. I'll give that a try tomorrow.
And burn the HEGOhttp://campaigns.ford-trucks.net/for...ons/icon14.gif Sounds exciting.
And burn the HEGOhttp://campaigns.ford-trucks.net/for...ons/icon14.gif Sounds exciting.
Thread Starter
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Mountain Pass
Joined: May 2004
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From: GARLAND, TX
OK, I just checked the voltage and Ohms on the EVP sensor and circuit. The voltage on the circuit back to the PCM is supposed near 5 volts. Mine is dead on 5 volts. The EVP sensor is supposed to measure 5000 ohms. Mine is measuring 3600 ohms. This would seem to explain codes 327 & 328 which state the EVP circuit is below the minimum voltage.
So I took the EVP sensor off and carried it up to my friendly neighborhood Autozone. They did a continuity test on the sensor which came back good, but they did not test the ohms reading. They told me they thought it was just dirty connectors. (and they were dirty) So I was hopeful for the cheap fix. Came home, cleaned the connectors. Still have the check eng light.
I think the EVP sensor is bad.
Can anyone confirm this, or do I need to keep looking?
So I took the EVP sensor off and carried it up to my friendly neighborhood Autozone. They did a continuity test on the sensor which came back good, but they did not test the ohms reading. They told me they thought it was just dirty connectors. (and they were dirty) So I was hopeful for the cheap fix. Came home, cleaned the connectors. Still have the check eng light.
I think the EVP sensor is bad.
Can anyone confirm this, or do I need to keep looking?
Mountain Pass
Joined: Jun 2008
Posts: 223
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From: kingston Ma
HEGO = Heated Exhaust Gas Oxygen sensor.
They are mounted on the Exhaust Header pipes ahead of the cat.
You take them out and burn the soot off with a propane torch and put them back in and they are good to go again, or so I am told (or read somewhere), I have not tried this myself.
They are mounted on the Exhaust Header pipes ahead of the cat.
You take them out and burn the soot off with a propane torch and put them back in and they are good to go again, or so I am told (or read somewhere), I have not tried this myself.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
If you look at the table on the fordfuelinjection site for the EVP sensor, it shows the range of voltages you should get as the valve moves from fully closed to fully open. The sensor has to report correct voltages for the whole range of movement, and it should vary smoothly without glitches. For this reason testing the sensor at only 1 position is meaningless and doesn't prove anything. On top of that, the valve defaults to closed at 0 vacuum and should report it's lowest voltage in that position, less than 1v. You may want to take another look at this.
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