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Chris(aka-Moose)
Chris(aka-Moose), Nissan Technician
Category: Nissan
Satisfied Customers: 621
Experience:  16 years of experience
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I have a 2009 Nissan Murano that doesn't show any codes with

Customer Question

I have a 2009 Nissan Murano that doesn't show any codes with a OBDII code reader. There are lights on the dash showing battery, brake, and recently AWD. Why no codes?
Submitted: 2 months ago.
Category: Nissan
Customer: replied 2 months ago.
The alternator has been replaced about 2 weeks ago.
Expert:  Gunvir Singh replied 2 months ago.

Hello, let me review your request. Please stand by.

Expert:  Gunvir Singh replied 2 months ago.

Is the check engine light on too?

Customer: replied 2 months ago.
no
Customer: replied 2 months ago.
The car is not here now
Expert:  Gunvir Singh replied 2 months ago.

The obd will only read code if check engine light is on. The combination of light you have present usually points towards low system voltage. Since the alternator was replaced 2 weeks ago need to start by checking for any loose connections or even a defective alternator is possible.

Customer: replied 2 months ago.
The voltage from the alternator at the battery terminals is high, 15.2 volts. The awd switch on the console doesn't turn on when pushed even though the AWD light is on. Tech manuals indicate the PCS should control the Alt. voltage,
Expert:  Gunvir Singh replied 2 months ago.

Was it doing the same before alternator replacement?

Customer: replied 2 months ago.
No. I wonder if there is a computer reset that needs to be done.
Expert:  Gunvir Singh replied 2 months ago.

Just checked and there is no reset procedure that needs to be done after alternator replacement.

Customer: replied 2 months ago.
Could the computer be faulty?
Expert:  Gunvir Singh replied 2 months ago.

There is a possibility but it wouldnt have waited 2 weeks for ot to act up. There is a possibilty of a afaulty voltage regulator in the alternator.

Customer: replied 2 months ago.
15.2 is high, but not high enough to do damage to components, and the IPDME should control the alternator voltage.
Expert:  Gunvir Singh replied 2 months ago.

Id the voltage staying steady at 15.2 or fluctuating?

Customer: replied 2 months ago.
Steady
Expert:  Gunvir Singh replied 2 months ago.

Tha altornator gets the signal from IPDM but voltage is still regulated by the regulator built inside the alternator.

Customer: replied 2 months ago.
Any way to monitor the PWM signal?
Expert:  Gunvir Singh replied 2 months ago.

Only with a compatible scan tool.

Customer: replied 2 months ago.
Which only Nissan dealers have?
Expert:  Gunvir Singh replied 2 months ago.

Not necesserily. A lot of independent repairs shops carry that tool too.

Customer: replied 2 months ago.
I can replace the alternator, but I would like to know if it is bad before I return it. Do you think 15.2 volts could cause the changing dash lights I see? I happened to remember the low tire alarm has been on for 3-4 years even though the tire pressures are correct.
Expert:  Gunvir Singh replied 2 months ago.

Once you have it out, most part stores have machines to test the alternator.

Customer: replied 2 months ago.
Besides the alternator is a major undertaking. This is the dumbest layout for an engine I have seen in 40 years of working on cars.
Customer: replied 2 months ago.
Not this alternator. It is one of the few most stores cannot test.
Expert:  Gunvir Singh replied 2 months ago.

Most you the newer vehicle especially ot asian and euro vehicles are like this.

Expert:  Gunvir Singh replied 2 months ago.

Do you have any other questions?

Customer: replied 2 months ago.
Not at this time, I will R&R the alternator and see if I have anymore questions at that time.
Expert:  Gunvir Singh replied 2 months ago.

Ok, keep me posted either way.