fault code 41
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From the Haynes manual
Chrysler OBD 1
Error code 41 / P0622
DRB Scan Tool Display = Generator Field not switching properly
"An open or shorted condition detected in the generator field control circuit"
Voltage regular is a component of default Nippondenso alternator.
...not saying that's the problem...
Make sure old codes are properly cleared. Must remove battery terminal and there is a specific power off/on protocol.
It was hell to remove a code 51 which I think is still hanging around...
Chrysler OBD 1
Error code 41 / P0622
DRB Scan Tool Display = Generator Field not switching properly
"An open or shorted condition detected in the generator field control circuit"
Voltage regular is a component of default Nippondenso alternator.
...not saying that's the problem...
Make sure old codes are properly cleared. Must remove battery terminal and there is a specific power off/on protocol.
It was hell to remove a code 51 which I think is still hanging around...
Last edited by 1990B150318; 06-20-2021 at 07:36 PM.
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If it has to do with charging it could be anything in that setup - even as simple as a battery with a bad cell. Right?
The are two other fault codes related to the charging system - 46 for high voltage, 47 for low voltage - so I'd feel pretty sure 41 is not to do with the voltage regulator in this case.
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Voltage regulator is what controls the field windings. If the alternator is internally regulated, and a replacement didn't solve the issue...... might try another alternator..... But, I keep getting mixed signals on just where the VR is.... some say alt, others say PCM.... I don't have any books for the vans, or anything that old.
And yes, it disturbs me that I think something made in the 90's is "Old"......
And yes, it disturbs me that I think something made in the 90's is "Old"......
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Here's why, at least from what I'm reading in the Haynes and the 1990 Chrysler Van manual - the VR on the PCM is 1992 and later models. There is a VR on the SBEC (ECM) 1988-1991 which is used with Chrysler alternators. Older models have an external VR mounted next to the ECM.
The Nippondenso which is the default alternator, has its own VR internally integrated. and doesn't rely on the onboard or an external VR.
That's what I've gathered.
My rookie opinion is that it's not the VR. If the VR was out, we'd see voltage out of range which would kick code 46 or 47. Incompatible alternator? I kinda doubt it but hey...
There is also the issue of the bad throttle bodies from this year which causes a hard hot start and rough idle, and it makes the system run in open loop mode. This has an effect on the electrical system.
know that mine runs about 14.2 but on a hot start, it stays at 13.7 and gets reduced fuel economy. I've a speedo that reads volts on the 12v line in real time, so I see it whenever I drive.
The Nippondenso which is the default alternator, has its own VR internally integrated. and doesn't rely on the onboard or an external VR.
That's what I've gathered.
My rookie opinion is that it's not the VR. If the VR was out, we'd see voltage out of range which would kick code 46 or 47. Incompatible alternator? I kinda doubt it but hey...
There is also the issue of the bad throttle bodies from this year which causes a hard hot start and rough idle, and it makes the system run in open loop mode. This has an effect on the electrical system.
know that mine runs about 14.2 but on a hot start, it stays at 13.7 and gets reduced fuel economy. I've a speedo that reads volts on the 12v line in real time, so I see it whenever I drive.
Last edited by 1990B150318; 06-21-2021 at 03:40 PM.