* DPC MODULE & INJECTION PUMP CONTROLLER *

SD diesels were widely available in the US in the 1981-86 Datsun/Nissan 720 pickups, and in Canada through '87 in the D21 pickup.

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nakturk
Posts: 5
Joined: 8 years ago
Location: Ankara / TR

#76

Post by nakturk »

Hi,
My 86 720 is either not starting or not stopping each time. So I decided to remove the DPC and it looks like as below.

Image
Image

While DPC has no cover but has all connections connected, when I push the upper rusted part to make it contact with the lower part, IPC makes a one turn (run-start-stop) and stops. So I believe IPC is OK.

But since I have no idea about a relay, I don't know what to do now, any clues please ?

As a second question, if I need to replace it, how should I search it (ie. how a relay named ? number, capacity ?)

thx.
1986 Double Cab 4x4 SD25
nakturk
Posts: 5
Joined: 8 years ago
Location: Ankara / TR

#77

Post by nakturk »

After some sanding and re-soldering, it works like new. Now I'm a happy guy :)

Thanks God you guys exist/existed to share all that information.
1986 Double Cab 4x4 SD25
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asavage
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Joined: 15 years ago
Location: Duvall, Wash.
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#78

Post by asavage »

nakturk wrote:But since I have no idea about a relay, I don't know what to do now, any clues please ?

As a second question, if I need to replace it, how should I search it (ie. how a relay named ? number, capacity ?)
I don't have a part number for you. I'd go to someplace like mouser.com (no minimum order) and look for a 12v coil relay with contacts to handle 10 amps. SPDT like OEM. Then extend all five (?) lines from the DPC Module to the relay. IOW, desolder the OEM relay, solder on five wires in its place (preferably in differing colors) and run them to the appropriate places on the replacement relay.

AFAIK, there is no "drop-in" replacement that will solder to the OEM board.

I did exactly what I describe above to my diesel Sentra's GP controller to restore afterglow when its relay crapped out like yours. Good pics: see this post.

Your sanding of the remains of the contacts will not last.

If you don't think that you're up to that job, I can do it for you, but it'll be a lot cheaper if you do it yourself (unless you cross-wire something). PM me if you need my help.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
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