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2005 nissan maxima 3.5 v6. codes P1212 and that CAN

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communication fault code U1001, vehicle...
2005 nissan maxima 3.5 v6. codes P1212 and that CAN communication fault code U1001, vehicle cranks but does not start, also the odometer does not work, can't see the PRNDL on cluster and the Aux fan is on max high when key ignition is on also the headlights are on. Sometimes it will start and run but the transmission is in failsafe.
Submitted: 2 years ago.Category: Nissan
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Answered in 1 minute by:
1/29/2016
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago
Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 4,664
Experience: Experienced automotive repair technician, Pulaski Tech graduate and DSM hobbyist.
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HEY THERE, thanks for the question.

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

The U1001 indicates the control unit CAN fault.

The condensor fan only verifies a control unit failure because it's fail safe for control unit failure.

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Customer reply replied 2 years ago
I know all that whats your best opinion to look for. I checked the grounds and i found a broken ground on the battery negative lead. I fixed that but still no go.
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

The U1001 is specific to the ECM communication

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

So you need to check for power going into the ECM, check the ground to firewall and transmission

if that checks out then the ECM is bad.

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Customer reply replied 2 years ago
What pins should i check at the ECM?
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

terminal 3 is a big red wire.

it should have power with key ON

let me check the back-up power one sec

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Customer reply replied 2 years ago
119 and 120 have power with key on backup power is available with key off
Customer reply replied 2 years ago
but why would the car start randomly and also sometimes every time if my battery is completely dead and i have a jump box on it to start it would that have any issues
Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

Having a bad battery will definately cause all kinds of weird electrical issues on these cars, but not a U1001 code.

The U1001 with the condesor fan is pretty coclusive of a control unit failure.

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Nissan Mechanic: Jake, Nissan Technician replied 2 years ago

So unless a CAN line is damaged (which would usually prevent any ECM communication. Then it's likely the ECM itself at fault.

Changing the ECM will also require key registration.

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