SD22 starting problem plz help!!!!!

[Williams]

Ok, I have got a problem with turning my car on and off and its real hard to explain but theres a rod on the left side of the block which should switch to either turn it on or off. I have these photos of the rod


You can notice the different possitions the rods in but i have to do this manually by touching two leads to the battery everytime i want to turn the car off =(.
If anyone knows anything on this my msn is sick_fest689@hotmail.com

Thanks Zac

[zen]

do a search for dpc (controller)

[asavage]

Please read the DPC Module & Injection Pump Controller thread

I'm not sure what you mean when you say, "i have to do this manually by touching two leads to the battery everytime i want to turn the car off ".

The most common DPC/IPC problem is a failed relay in the DPC Module (details in that thread above), followed by worn or missing plastic bushings on the rod between the IP lever and the IPC motor. Sometimes the IPC motor craps out too.

There is a IPC test procedure in the Factory Service Manual, which I've reproduced (details in that thread above). If the IPC motor passes those tests, it's likely that your DPC module has failed, but there are other reasons why the DPC system won't work; we'll need more details to help.

[Williams]

Easiest way to show what I mean by manually is this picture



I've got the leads stashed up the back to be out the way but, by touching one on each terminal I can rotate the connecting rod to positions 1, 2, and 3. So after reading the other topic I'm assuming it's the DPC. So once I have time I'll check the relay and board since its never been replaced in 180k miles, so thanks for all the help.

Zac

[philip]

-SNIP- So after reading the other topic I'm assuming it's the DPC. So once I have time I'll check the relay and board since its never been replaced in 180k miles, so thanks for all the help.

Zac

USA Nissan charges almost $200. How much $$$ in Australia?

[Williams]

For the whole unit the only place i found to get it was japan and they want 700$$ for it so im going to see about trying to fix it first before going to that extreme lol.

Zac

[philip]

Al mentions a 'reasonable' new DPC module ($184 USD). Nismo Parts. You'll have to email or call and ask if this part is still available and mailing price to Australia.

[asavage]

And, if the relay has failed, it can be replaced.

[Williams]

Thanks for all the help i had a quick look at it yesturday the relay looks old but not worn and tested the diodes many which failed so next thing is to take the components out to re test them so if its not the dpc i really dont know whats wrong. I have one question which is.. If i can move the position of the injection pump lever by touching those two leads (picture in preious post) on the battery does that mean the controller is fine and is an electrical problem on the dpc side of the circuit?

Zac

[asavage]

If i can move the position of the injection pump lever by touching those two leads (picture in preious post) on the battery does that mean the controller is fine and is an electrical problem on the dpc side of the circuit?

No. The internal contacts in the IPC motor gearcase may be fouled. Use the factory test procedure outlined at the link I provided above -- it's a couple of pages into the thread. Using that test, you can certify that the IPC is not the problem -- or that it is.

[philip]

Thanks for all the help i had a quick look at it yesturday the relay looks old but not worn and tested the diodes many which failed so next thing is to take the components out to re test them so if its not the dpc i really dont know whats wrong. I have one question which is.. If i can move the position of the injection pump lever by touching those two leads (picture in preious post) on the battery does that mean the controller is fine and is an electrical problem on the dpc side of the circuit?

Zac

While your DPC's cover is off, plug up both DPC to the harnass and plug up the Injection Pump Controller motor to its harnass. Now (with somebody else turning the ignition key) turn you ignition from OFF to ON ... wait for 5 seconds and then turn from ON to START for 2 seconds and release to ON. Notice the DPC's -relay-. It must contact and then release. Just because you think the relay looks sound does not mean it is electrially sound.

Another way is: Turn the ignition from OFF to ON. Now, unplug the small, 4 pin plug nex to the fire wall that leads to the transmission. Notice if the IP is rotated and stoped. Reconnect this plug ... the IP will rotate again. If not response and you see no movement in the DPC's little relay, you have confirmed the DPC or the relay is toast.

I've replaced three DPC so for ... with an external relay. Lot's cheaper too.