EGR problems, EVR questions
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Senior User
Joined: May 2004
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EGR problems, EVR questions
92 f-150 super M5OD. I have a code 322 i can't get fixed. I have been over the system and found a couple of minor vac leaks and fixed them, replaced the EVR, cleaned the EGR and verified it was opening with vacium, cleaned terminals and system ground, replaced the EGR position sensor and I still have the code. I even ran a couple of wires from the EVR back into the front seat to a digital voltmeter to check voltage while driving. This test showed 0.43 V at idle and went up to about 13.5 V in 3 rd gear about 30 mph. This was done between the two EVR lead off wires. Individual testing of each wire to ground in the driveway showed 14.07 V on both.
The only thing left to do that I can think of is to "T" the green vac line to the EGR and run it into the front seat to a guage then go for another ride. I don't have the vac line or the "T" tonight but will do it if someone here does not have a better idea. The voltage readings look suspicious but I don't really know.
At this point I sure would appreciate some advice.
The only thing left to do that I can think of is to "T" the green vac line to the EGR and run it into the front seat to a guage then go for another ride. I don't have the vac line or the "T" tonight but will do it if someone here does not have a better idea. The voltage readings look suspicious but I don't really know.
At this point I sure would appreciate some advice.
Elder User
Joined: Jul 2004
Posts: 911
Likes: 2
From: Northern Virginia, USA
If this is a "memory" code, not an engine-running code, clear the computer codes. You can do this by running an engine-off test, and pulling the STI/STO jumper out during code playback.
Otherwise:
Approximately +12V from both terminals to ground is correct. The Ford ECU has everything directly connected to a +12V source, and then selectively completes the ground circuit to turn things on. So, with the EVR plugged in, both terminals will always be "hot". The fact that you get a voltage drop (~13.5 at 30mph) across the two terminals means that the EVR solenoid is drawing current, and is working electrically.
Does the EGR hold vacuum? Put a piece of hose on and use lung power; you'll know if it holds or not.
Check the position sensor wiring back to the PCM. Holding the connector so the "dummy" pin is on top, check for ~5V between the left pin (VREF) and the bottom pin (SIG RETURN). If no voltage, try between VREF and regular ground. If you get voltage now, you have an open circuit in the wiring harness. Less likely, as SIG RETURN is used by many devices. If voltage is good, check the resistance between the brown-light green wire (EVR) and pin 27 on the ECU connector.
Otherwise:
Approximately +12V from both terminals to ground is correct. The Ford ECU has everything directly connected to a +12V source, and then selectively completes the ground circuit to turn things on. So, with the EVR plugged in, both terminals will always be "hot". The fact that you get a voltage drop (~13.5 at 30mph) across the two terminals means that the EVR solenoid is drawing current, and is working electrically.
Does the EGR hold vacuum? Put a piece of hose on and use lung power; you'll know if it holds or not.
Check the position sensor wiring back to the PCM. Holding the connector so the "dummy" pin is on top, check for ~5V between the left pin (VREF) and the bottom pin (SIG RETURN). If no voltage, try between VREF and regular ground. If you get voltage now, you have an open circuit in the wiring harness. Less likely, as SIG RETURN is used by many devices. If voltage is good, check the resistance between the brown-light green wire (EVR) and pin 27 on the ECU connector.
