How many volts on airpump at idle?
#2
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its just on and off, so 12?
#3
RX-7 Bad Ass
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Yep, 12v. It gets a constant 12v on one wire and the other wire the ECU grounds out when it commands the air pump to run.
Dale
Dale
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#5
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1. Can a Power FC run the air pump?
2. Can you have the air pump running constantly (say if the Power FC doe not have a function for it)?
3. If you have the air pump constantly pumping air just back to the cat, is there a potential problem with that?
(The thought here is to have the emission benefit without retrofitting a deleted ACV. Right now my air pump is essentially acting as an idler pulley with the associated air hoses missing or blocked off and the harness side connector absent. I want to return to at least to have the look of having the system complete, if there is some actual functional purpose, even better.)
2. Can you have the air pump running constantly (say if the Power FC doe not have a function for it)?
3. If you have the air pump constantly pumping air just back to the cat, is there a potential problem with that?
(The thought here is to have the emission benefit without retrofitting a deleted ACV. Right now my air pump is essentially acting as an idler pulley with the associated air hoses missing or blocked off and the harness side connector absent. I want to return to at least to have the look of having the system complete, if there is some actual functional purpose, even better.)
Last edited by Redbul; 02-04-22 at 11:39 AM. Reason: added info.
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the PFC does run the air pump. most of the time the air pump air is going to "Port Air", the exhaust ports.
if you have it running all the time things get hot, its been done though.
just the air pump at port air cuts down the unbourned hydrocarbons by a lot, like ~5000ppm to 1900ppm.
if you have it running all the time things get hot, its been done though.
just the air pump at port air cuts down the unbourned hydrocarbons by a lot, like ~5000ppm to 1900ppm.
#7
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I think I would need to reinstall the ACV to run to port air?
I am thinking just to connect the pipes straight through to the cat.
Would that cause the cat to heat up too much?
If I connect the wires back to the ecu, will the ecu expect the extra air to be there, when it tells the air pump to come on?
Although my air pump has been disconnected, and the EM wires deleted, I suspect the wiring back from x-05 to the ecu (through F harness and the relay) have been left in place.
Does a Power FC actually use data from the O2 sensor (which would be affected by the extra air in the port)?
By that, I mean, would the ecu expect to see the extra O2, when it tells the air pump to turn on?
And if the o2 does not show up, get confused?
I am thinking just to connect the pipes straight through to the cat.
Would that cause the cat to heat up too much?
If I connect the wires back to the ecu, will the ecu expect the extra air to be there, when it tells the air pump to come on?
Although my air pump has been disconnected, and the EM wires deleted, I suspect the wiring back from x-05 to the ecu (through F harness and the relay) have been left in place.
Does a Power FC actually use data from the O2 sensor (which would be affected by the extra air in the port)?
By that, I mean, would the ecu expect to see the extra O2, when it tells the air pump to turn on?
And if the o2 does not show up, get confused?
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#8
rotorhead
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read this thread https://www.rx7club.com/3rd-generati...ntrols-841963/
The air pump defaults to flowing to the exhaust ports. In some cruising areas, it switches air to the cat. If the ECU doesn't want to flow air to either of them, the air goes out the relief valve in the ACV and the ECU can disconnect the pump by using the clutch. Older rotaries did not have a clutch for the air pump, and used the relief valve only. When the Rx-8 came out the air pump was fully electric and only ran for a limited time after a cold start.
When the air is flowing to the exhaust ports the o2 sensor is ignored, but in cruising areas it is used. The Power FC mostly copies this type of control, but only if it's using a mostly stock mapping. Most tuned Power FC's turn off the O2 sensor, but that doesn't affect the air pump as long as the clutch and ACV are working right.
The air pump defaults to flowing to the exhaust ports. In some cruising areas, it switches air to the cat. If the ECU doesn't want to flow air to either of them, the air goes out the relief valve in the ACV and the ECU can disconnect the pump by using the clutch. Older rotaries did not have a clutch for the air pump, and used the relief valve only. When the Rx-8 came out the air pump was fully electric and only ran for a limited time after a cold start.
When the air is flowing to the exhaust ports the o2 sensor is ignored, but in cruising areas it is used. The Power FC mostly copies this type of control, but only if it's using a mostly stock mapping. Most tuned Power FC's turn off the O2 sensor, but that doesn't affect the air pump as long as the clutch and ACV are working right.
Last edited by arghx; 02-04-22 at 01:05 PM.
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Redbul (02-04-22)
#10
Okay, so I hate to ask, but I tried pulling the relay out of the box to look at, and for the life of me I could not get that relay out.
I didn't want to force it and break something. Can someone kindly instruct me in how to get that air pump relay out so I can test it? Pulling does nothing, so I must be doing something wrong.
Edit: I also tried pushing inwards on the white looking tabs on both sides before pulling, same thing.
I didn't want to force it and break something. Can someone kindly instruct me in how to get that air pump relay out so I can test it? Pulling does nothing, so I must be doing something wrong.
Edit: I also tried pushing inwards on the white looking tabs on both sides before pulling, same thing.
Last edited by SwappedNA; 02-04-22 at 09:41 PM.
#11
RX-7 Bad Ass
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Before going crazy on the relay check the fuse, it's common for it to blow since the air pump wiring gets cracked and janky over time and it touches the air pump bracket and shorts out.
I believe it's on it's own circuit, it doesn't share with the AC compressor.
Dale
I believe it's on it's own circuit, it doesn't share with the AC compressor.
Dale
#18
Well, I heard back from my technician today. It seems the pump actually is getting 12v, the resistance at the air pump is fine on the pump side plug as well. However, it still will not kick on. He mentioned that when he grounds out the respective ground wire on the harness side of the car, with the plug connected to the air pump, the pump kicks on.
What could be the final issue here? I'm thinking the relay?
What could be the final issue here? I'm thinking the relay?
Last edited by SwappedNA; 03-04-22 at 05:25 PM. Reason: Corrected information
#20
Theoretical Tinkerer
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Well, I heard back from my technician today. It seems the pump actually is getting 12v, the resistance at the air pump is fine on the pump side plug as well. However, it still will not kick on. He mentioned that when he grounds out the respective ground wire on the harness side of the car, with the plug connected to the air pump, the pump kicks on.
What could be the final issue here? I'm thinking the relay?
What could be the final issue here? I'm thinking the relay?
2) Signal from ECU to air pump relay isn't working or getting to the relay, Pin 2J.
3) If wiring is good, relay is malfunctioning.
I don't have any tips for relay removal, but you should be able to probe the wiring and check for signal/continuity.
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