Another 3 ACD Light Thread - Code 47 ?
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Another 3 ACD Light Thread - Code 47 ?
I recently purchased an Evo IX MR with the exciting 3 ACD light error. I did quite a bit of searching around on here and found a few things to try.
First, I tried to cycle the key to the 'ON' position and floor the pedal after 5 seconds. This did absolutely nothing.
Next, I tried disconnecting the battery for several minutes. Then I reconnected it and cycled the key to 'ON'. This time I heard some intial clicking from what sounded like a relay as soon as I turned the key to 'ON', but after 5 seconds I still couldn't get the pump to come on. I should add that I still had 3 solid ACD lights as soon as I turned the key to 'ON'.
I tried this several times with the same results.
Then I disconnected the battery and the solenoid connection on the top of the pump and jumped it directly to the battery. This fired the pump right up and sucked quite a bit of fluid out of the ACD reservoir. I used this technique to then verify that the pump was bled with the bleed screw and it seemed ok.
I reconnected everything and as soon as I turned the key to 'ON' I had 3 solid ACD lights with the same results as before (clicking right away, no pump activation with the gas pedal).
I also checked the code I was getting by jumping the 1-4 pins and based on my understand I'm getting code 47. However, the list I have doesn't show code 47. Did my Evo make up a new code, or did I do this wrong?
https://www.evolutionm.net/forums/9356352-post10.html
Here's the video:
I also replaced the ACD relay and I checked the 60A fuse on the battery terminal with a continuity check using my multimeter and it seems like the fuse is ok?
In summary, I can't get the pump to come on without jumping the battery to the solenoid and my computer made up a code.
I'll see what it does tomorrow after sitting overnight with the battery disconnected.
First, I tried to cycle the key to the 'ON' position and floor the pedal after 5 seconds. This did absolutely nothing.
Next, I tried disconnecting the battery for several minutes. Then I reconnected it and cycled the key to 'ON'. This time I heard some intial clicking from what sounded like a relay as soon as I turned the key to 'ON', but after 5 seconds I still couldn't get the pump to come on. I should add that I still had 3 solid ACD lights as soon as I turned the key to 'ON'.
I tried this several times with the same results.
Then I disconnected the battery and the solenoid connection on the top of the pump and jumped it directly to the battery. This fired the pump right up and sucked quite a bit of fluid out of the ACD reservoir. I used this technique to then verify that the pump was bled with the bleed screw and it seemed ok.
I reconnected everything and as soon as I turned the key to 'ON' I had 3 solid ACD lights with the same results as before (clicking right away, no pump activation with the gas pedal).
I also checked the code I was getting by jumping the 1-4 pins and based on my understand I'm getting code 47. However, the list I have doesn't show code 47. Did my Evo make up a new code, or did I do this wrong?
https://www.evolutionm.net/forums/9356352-post10.html
Here's the video:
I also replaced the ACD relay and I checked the 60A fuse on the battery terminal with a continuity check using my multimeter and it seems like the fuse is ok?
In summary, I can't get the pump to come on without jumping the battery to the solenoid and my computer made up a code.
I'll see what it does tomorrow after sitting overnight with the battery disconnected.
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Thanks to google I found a longer list of codes.
http://www.evoscan.com/technical-veh...cd-ayc-sayc-at
So I guess code 47 has to do with voltage to the pressure sensor.
http://www.evoscan.com/technical-veh...cd-ayc-sayc-at
So I guess code 47 has to do with voltage to the pressure sensor.
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After leaving it sit overnight as soon as I reconnected the battery and turned the key to 'ON' I had 3 solid lights and even with the gas pedal the pump didn't cycle. Could it be a bad connection somewhere or will the pump not even start with a bad sensor?
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I took a look at the connectors today on the ACD control box and they looked ok. The grounds on the side also looked clean and tight.
Additionally, I can run the pump by jumping the relay, so I'm pretty sure that everything passed the relay in the wiring is good.
I'm still not sure why the lights would be on as soon as the battery is re-connected. Shouldn't the lights be off until you press the gas with the key set to 'ON', or is that not how it works?
Additionally, I can run the pump by jumping the relay, so I'm pretty sure that everything passed the relay in the wiring is good.
I'm still not sure why the lights would be on as soon as the battery is re-connected. Shouldn't the lights be off until you press the gas with the key set to 'ON', or is that not how it works?
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To add to the confusion after a morning autocross session today I was pulling out of a parking lot and surprisingly the ACD system was functional! I drove back to the autocross for the second session and cycled the car off and back to run and the pump definitely came on.
Sadly, when it was time for my runs the ACD was back to three solid lights. Any suggestions?
Sadly, when it was time for my runs the ACD was back to three solid lights. Any suggestions?
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I tried a few more ideas today. I swapped batteries around thinking that maybe the current battery was struggling to start the pump (based partially on the power supply to the pressure sensor code). However, there was no change.
Next, I pulled the bumper and inspected the pump. It doesn't seem to have the common signs of corrosion which would make sense as this pump has less than 40k on it and 30k of that was in California.
I pulled all of the connectors and inspected them, and they looked ok. I also put dielectric grease on the pressure sensor connection as well as the chassis grounds. This had no effect.
Finally, I tested the pressure sensor connection with my multimeter and confirmed a +5V signal on one wire and continuity on another wire to the negative terminal/chassis. I believe this is correct.
Based on my analysis so far the electrics from the relay to the pump are functional. Also, the pressure sensor seems to be getting the correct voltage supply. I suspect that I may have a bad pressure sensor. Any thoughts? Is there any way to test the pressure sensor using a multimeter?
Next, I pulled the bumper and inspected the pump. It doesn't seem to have the common signs of corrosion which would make sense as this pump has less than 40k on it and 30k of that was in California.
I pulled all of the connectors and inspected them, and they looked ok. I also put dielectric grease on the pressure sensor connection as well as the chassis grounds. This had no effect.
Finally, I tested the pressure sensor connection with my multimeter and confirmed a +5V signal on one wire and continuity on another wire to the negative terminal/chassis. I believe this is correct.
Based on my analysis so far the electrics from the relay to the pump are functional. Also, the pressure sensor seems to be getting the correct voltage supply. I suspect that I may have a bad pressure sensor. Any thoughts? Is there any way to test the pressure sensor using a multimeter?
Last edited by Rexpelagi; Jul 14, 2012 at 01:54 PM.
#12
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connect the sensor...
on sensor pin 1 you should have 5V, on pin 3 should be the ground..
pin 2 is the signal..
turn the ignition on and check for 5 V and measure the voltage on pin 2 vs the ground..
then run the pump manually and measure the voltage again...
on sensor pin 1 you should have 5V, on pin 3 should be the ground..
pin 2 is the signal..
turn the ignition on and check for 5 V and measure the voltage on pin 2 vs the ground..
then run the pump manually and measure the voltage again...
#13
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for the record... the sensor can be replaced, if you can find one..
I am working on a new replacement, but it will not be cheap unfortunately...
somehow, I still think you might have a harness problem so checking the resistance of the leads from the sensor connector to the ACD ECU might be another thing to do..
I am working on a new replacement, but it will not be cheap unfortunately...
somehow, I still think you might have a harness problem so checking the resistance of the leads from the sensor connector to the ACD ECU might be another thing to do..
#14
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while you have the pump exposed... you should seal it against the elements... Silicone around the pump joints + heavy grease around the valves..
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Wow, thanks for all the info!
I will check the voltages on the pressure sensor signal wire. Is there an easy way to access the wires when the connector is plugged in or should I just cut a small slit in the wire insulation to get my probe on the wire and then seal it with electrical tape?
I have the bumper back on for now as I have an autocross tomorrow but I'll probably get some time this week to check the pressure sensor signals. Do you happen to know the range they should be in from atmospheric to full pressure?
While anything is possible I would think a harness problem would be less likely. To my knowledge nothing had been done to the car recently when the pump stopped working. If I get a chance I can check the harness on the ACD ECU. Is there a pin diagram so I know what to check?
If I can't get anything useful from checking the pressure sensor voltages I may take it to the dealer and see if they can run a more thorough diagnostic check. If they can at least point me in the right direction it will be worth the $120.
Edit: One post I found says the pressure sensor signal wire should be between 0.5-1.5V, which corresponds to the system pressure in MPa. I didn't think the pump went beyond 1.0MPa though...
Edit 2: I found the pin diagram:
http://www.evoscan.com/technical-veh...cd-ayc-sayc-at
I will check the voltages on the pressure sensor signal wire. Is there an easy way to access the wires when the connector is plugged in or should I just cut a small slit in the wire insulation to get my probe on the wire and then seal it with electrical tape?
I have the bumper back on for now as I have an autocross tomorrow but I'll probably get some time this week to check the pressure sensor signals. Do you happen to know the range they should be in from atmospheric to full pressure?
While anything is possible I would think a harness problem would be less likely. To my knowledge nothing had been done to the car recently when the pump stopped working. If I get a chance I can check the harness on the ACD ECU. Is there a pin diagram so I know what to check?
If I can't get anything useful from checking the pressure sensor voltages I may take it to the dealer and see if they can run a more thorough diagnostic check. If they can at least point me in the right direction it will be worth the $120.
Edit: One post I found says the pressure sensor signal wire should be between 0.5-1.5V, which corresponds to the system pressure in MPa. I didn't think the pump went beyond 1.0MPa though...
Edit 2: I found the pin diagram:
http://www.evoscan.com/technical-veh...cd-ayc-sayc-at
Last edited by Rexpelagi; Jul 14, 2012 at 07:54 PM.