* DPC MODULE & INJECTION PUMP CONTROLLER *
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- asavage
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The IPC test procedure in the 1982 FSM was posted above, but I repeat it here. I've chopped this page from the FSM to make this a bit clearer (click on image for larger):
Although the FSM says what the expected result of those tests are (the motor should stop at the STOP, RUN, and START positions), I've just tested all three DPCs I have loose. None of them would stop at those places: they will all coast on by and get powered by the next contact, resulting in the IPC running all the time, with fits & starts.
I had one of these do it on the truck, IIRC (the "Bellingham Truck") a couple of years ago.
I have made my very first foray into video (with my clothes on, anyway), and here you can see me testing three DPCs using the OEM test procedure above.
DPC_Testing.wmv (16MiB)
Has anyone else actually used the OEM test procedure on a DPC and had the DPC stop on a dime? I'm really exasperated at this.
Although the FSM says what the expected result of those tests are (the motor should stop at the STOP, RUN, and START positions), I've just tested all three DPCs I have loose. None of them would stop at those places: they will all coast on by and get powered by the next contact, resulting in the IPC running all the time, with fits & starts.
I had one of these do it on the truck, IIRC (the "Bellingham Truck") a couple of years ago.
I have made my very first foray into video (with my clothes on, anyway), and here you can see me testing three DPCs using the OEM test procedure above.
DPC_Testing.wmv (16MiB)
Has anyone else actually used the OEM test procedure on a DPC and had the DPC stop on a dime? I'm really exasperated at this.
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.
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.
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
Do you have a 720 truck to test your DPC's?asavage wrote:-SNIP-
Has anyone else actually used the OEM test procedure on a DPC and had the DPC stop on a dime? I'm really exasperated at this.
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
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I have the engine from the "Bellingham Truck" on a pallet in the back of the "Arlington Truck" with a canopy over all. It's dry, but pretty cozy in there, as there is also a trans, battery, driveshafts, etc. sharing the space. I could bolt one on to it. It's a little hard to get to, but do-able. Weather is not wet right now, but highs in the high 30's today: fairly cold for here. Frost on everything right now. Maybe tomorrow afternoon.
Have you done this test on either of yours, Philip?
Have you done this test on either of yours, Philip?
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
I was away all day yesterday (12/9) at the Long Beach Bike Show.asavage wrote:-SNIP- Have you done this test on either of yours, Philip?
I do have two DPC-controller. One is on the truck and the other is that one I bought through eBay. The Seller had snipped off the DPC wires right at the plug (dumb). Everything inside is there and now clean but I never tested it. Obviously, the little motor will run continuously when the circuitry does not pass through the wheel / contacts. That's why I suggested plugging your DPC-controller into the truck harnass so that the DPC-module will operate the whole system.
See FSM_1982_EL-047
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
Well, why not?philip wrote:The Seller had snipped off the DPC wires right at the plug (dumb). Everything inside is there and now clean but I never tested it.
That's the reason for the special hookup during the FSM test shown above: to test the contacts as well as the motor. Test A tests the motor only; Test B further tests the contacts:Obviously, the little motor will run continuously when the circuitry does not pass through the wheel / contacts.
- Connect wires for pins 12 & 13 together
- Connect battery Neg to pin 14
- Connect battery Pos to pin 8
- Tap battery Pos to pins 9, 10, 11 to test the motor & contacts
There is no mention of the DPC having to be mounted to perform these tests.
Last edited by asavage 16 years ago, edited 1 time in total.
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.
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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- Location: Canada
Perhaps the momentum of the unloaded spinning armature is sufficient to carry the switching through the 'stop' position and into the next 'run' position?asavage wrote: Has anyone else actually used the OEM test procedure on a DPC and had the DPC stop on a dime? I'm really exasperated at this.
N_R
The old 'six gun' was as popular as the cell phone in its time and just as annoying when it went off in the Theater.
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
It (almost) stops that quick unless ... you leave out the little drag clip on the end of armature.Nissan_Ranger wrote:asavage wrote: Has anyone else actually used the OEM test procedure on a DPC and had the DPC stop on a dime? I'm really exasperated at this.
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
You're making me WORK.asavage wrote:-SNIP- @Philip: I haven't had any of these three apart. Three missing thrust clips?
Obviously my truck's DPC system works so ... I tested that used DPC controller. This is the one with the electrical plug that had been clipped.
CLICK on this video picture.
Alternate site
Alternate site
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
Mmmmm... since the motors work, I doubt you have failures. Maybe two of the pins are in the wrong socket?asavage wrote:I appreciate your work, Philip.
So . . . I have three bad IPCs, all with the same failure mode? Hmmm.
Send them all to me. I'll test 'em.
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
I figured it out -- and your picture was the clue: the motorcycle battery.
I measured my Interstate: 12.8v at rest.
I dragged out an antique Kirkland POS and meaured it: 11.4v.
Repeated a test: DPC stops perfectly at every station. Measured Kirkland battery again: 10.5v.
Connected DPC back to Interstate battery: runs & runs & runs.
Conclusion: use a weak battery or power source to perform the DPC test. Do not use a fully-charged battery.
I measured my Interstate: 12.8v at rest.
I dragged out an antique Kirkland POS and meaured it: 11.4v.
Repeated a test: DPC stops perfectly at every station. Measured Kirkland battery again: 10.5v.
Connected DPC back to Interstate battery: runs & runs & runs.
Conclusion: use a weak battery or power source to perform the DPC test. Do not use a fully-charged battery.
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.
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.
- philip
- Deceased
- Posts: 1494
- Joined: 18 years ago
- Location: Southern California, USA
The battery I used is a Yuasa YB18L-A (6cells) battery which right now ... registers at 12.4 volts, using Micronta digital VOM. That size battery is for Honda Gold Wings (1200cc for that particular older model)
-Philip
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
Passed 08May2008
My friend, you are missed . . .
1982 Datsun 720KC SD-22
"Im slow and I'm ahead of you"
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
- asavage
- Site Admin
- Posts: 5433
- Joined: 18 years ago
- Location: Oak Harbor, Wash.
- Contact:
The DPC Module (black box near right hood hinge, two plugs) is Nissan
No. 19850-31W02, $184 (if available)
The IPC Motor is Nissan No. 19811-36W02,
$359 (if available)
No. 19850-31W02, $184 (if available)
The IPC Motor is Nissan No. 19811-36W02,
$359 (if available)
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