05 Maxima, no power to ECM
03-01-2021, 07:35 PM
#1
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Posts: 4
05 Maxima, no power to ECM
I'm working on a 05 Maxima with no power to the ECM, constant power is showing 12V but the IGN On is showing no voltage on both power terminals. I checked all of the fuses, swapped the relay and still no power with key on. I am checking the wiring and power to the relay now but was wondering if anyone had a link to the shop manual?
I searched and found the manual for a 02 but it is different than the 05. (http://boredmder.com/FSMs/Nissan/Maxima/2002/EC.pdf)
I'm mainly looking for the ECM Pinout at the connectors and wiring diagram. I believe I found the main power supply on the one plug but knowing what else to check is very helpful. The grounds are good for sure. I have no 12V on 2 of the power wires at the ECM with key on.
No start, no CEL with key on, can com errors as well.
Does anyone have a link to a PDF? Any help is appreciated!
05 Maxima 3.5
Update: I do have 12V at the relay on both terminals, the ground appears to be weak however, not a solid ground but without a manual I am shooting in the dark. No clicking of the relay or noise heard, swapped with another relay and no change.
I searched and found the manual for a 02 but it is different than the 05. (http://boredmder.com/FSMs/Nissan/Maxima/2002/EC.pdf)
I'm mainly looking for the ECM Pinout at the connectors and wiring diagram. I believe I found the main power supply on the one plug but knowing what else to check is very helpful. The grounds are good for sure. I have no 12V on 2 of the power wires at the ECM with key on.
No start, no CEL with key on, can com errors as well.
Does anyone have a link to a PDF? Any help is appreciated!
05 Maxima 3.5
Update: I do have 12V at the relay on both terminals, the ground appears to be weak however, not a solid ground but without a manual I am shooting in the dark. No clicking of the relay or noise heard, swapped with another relay and no change.
Last edited by silentdub; 03-01-2021 at 07:47 PM.
03-02-2021, 04:12 AM
#2
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Join Date: Sep 2020
Posts: 384
03-02-2021, 10:34 AM
#3
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You're awesome! I owe ya one!
03-02-2021, 01:07 PM
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Join Date: Sep 2020
Posts: 384
No worries. You owe Eddy - https://www.my4dsc.com/about/
03-02-2021, 10:02 PM
#5
Sounds like my g35 I'm fighting with RN.
Definitely following.
PS the IPDM is responsible for sending power to the two main power wires on the ECU.
I'm going to be lazy and just bypass the IPDM with a switch just so I can get rid of the car, but if you find the root problem i am definitely here to learn.
(All nissans of the same time period are electronically the same, so yes the G35 is extremely relavant).
Definitely following.
PS the IPDM is responsible for sending power to the two main power wires on the ECU.
I'm going to be lazy and just bypass the IPDM with a switch just so I can get rid of the car, but if you find the root problem i am definitely here to learn.
(All nissans of the same time period are electronically the same, so yes the G35 is extremely relavant).
Last edited by aackshun; 03-02-2021 at 10:23 PM.
03-03-2021, 08:13 PM
#6
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Join Date: Mar 2021
Posts: 2
no power from ecm to throttle body
Hey ive got a 2005 maxima and originally i was having a bad batt issue ...had to jump it all of the time. Well j7mping it all the time like that screwed with the ecm and i was told that it n3eded to be "flashed". I sent my ecm in to have it flashed and put it back i to the car but then suddenly I was have issue with the throttle body....so we g9t a new throttle body in it and have done the relearn a handful of times to no avail. I have zero response from the throttle and am now stuck 8n l8mp mode. We got it down to the shop a bl9ck from home and the mechanic didnt bother hooking it up to the obd2 because "theres no power coming from the ecm to the throttle body" thats what he said and charged me $40 for his time. Can someone please 9ffer some advise please i have been without my car since June of last year.
03-03-2021, 08:18 PM
#7
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Join Date: Mar 2021
Posts: 2
Hey ive got a 2005 maxima and originally i was having a bad batt issue ...had to jump it all of the time. Well j7mping it all the time like that screwed with the ecm and i was told that it n3eded to be "flashed". I sent my ecm in to have it flashed and put it back i to the car but then suddenly I was have issue with the throttle body....so we g9t a new throttle body in it and have done the relearn a handful of times to no avail. I have zero response from the throttle and am now stuck 8n l8mp mode. We got it down to the shop a bl9ck from home and the mechanic didnt bother hooking it up to the obd2 because "theres no power coming from the ecm to the throttle body" thats what he said and charged me $40 for his time. Can someone please 9ffer some advise please i have been without my car since June of last year.
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