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linden cahill

Member

• Jan 4, 2025

• #1

hi
having heaps of bother with my 2015 d4
battery light on
no charge voltage at battery positive
both batteries new from landrover
due to various fault codes ive fitted new battery monitor sensor and change the fuseable link on batt positive to bms
changed alternator,no different
i have no voltage down the exciter wire to the alternator when engine is running,i know that this voltage is controlled by the ecu as a signal to turn on the alternator but im getting nothing.
can anyone point me to a wiring diagram for the exciter wire please
i am getting code PO65B-16 Generator control-circuit range/performance-circuit voltage below threshold
thankyou

 

Graculus

Well-Known Member

• Jan 4, 2025

• #2

So basically you've fire the parts cannon before diagnosing the cause?

 

Attachments

• Generator and Regulator.pdf

  120.6 KB · Views: 74

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linden cahill

Member

• Jan 4, 2025

• #3

Graculus said:

So basically you've fire the parts cannon before diagnosing the cause?

Click to expand...

Yes I did like a fool,but there you go.
I've found today buy actually doing some diagnostic tests that I have no signal voltage down the exciter wire when engine is running, it's a one wire plug that according to your diagram and autodata runs directly to ecu ,autodata says pin 30 but can't locate that due to masses of wires, was wanting to do a continuity check down the wire.next job is to try and get an ecu pin out diagram.
Thanks for the info

 

Graculus

Well-Known Member

• Jan 4, 2025

• #4

The connectors are numbered - can't remember if on the pin or socket side.
Because it's a LIN, expect to see it fluctuating between 10-11VDC, if you get full battery voltage, it's a short to +ve
I'd also check at the intermediate connector C3069/C3070 first, if you check pin 4 on that connector, with the connector open, you should get LIN on both connectors, obviously investigate the side you don't get the correct voltage.

 

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linden cahill

Member

• Jan 4, 2025

• #5

Graculus said:

The connectors are numbered - can't remember if on the pin or socket side.
Because it's a LIN, expect to see it fluctuating between 10-11VDC, if you get full battery voltage, it's a short to +ve
I'd also check at the intermediate connector C3069/C3070 first, if you check pin 4 on that connector, with the connector open, you should get LIN on both connectors, obviously investigate the side you don't get the correct voltage.

View attachment 332777

Click to expand...

Ok thanks
Getting a bit out of my remit if I'm honest, I'll try and make sense of it all but might need someone in the know to sort this now, feel free to drop by lol

 

sierrafery

Well-Known Member

• Jan 5, 2025

• #6

linden cahill said:

...next job is to try and get an ecu pin out diagram.

Click to expand...

Hi, the two relevant connectors attached

 

Attachments

• C3070R.pdf

  302.9 KB · Views: 63
• D4 C0658R ECU.pdf

  435.5 KB · Views: 64

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linden cahill

Member

• Jan 8, 2025

• #7

hi
thanks for this
i found the issue,it was the Gate way module itself,it had 5 codes that would not clear.
fitted a new one and all good.
i opend the old module to fine a very small patch of corrosion on the circuit board causing all my issues
regards

 

Graculus

Well-Known Member

• Jan 8, 2025

• #8

Any signs of water ingress?

 

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linden cahill

Member

• Jan 11, 2025

• #9

Graculus said:

Any signs of water ingress?

Click to expand...

Yes but only when I opened up the GWM, everything else looks dry in that area but obviously it's got damp inside the module somehow, sunroof drain pipe probably runs down the inside of a. Post but like I say car is snuff dry inside

 

Attachments

• 
  20250108_090023.jpg

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Graculus

Well-Known Member

• Jan 11, 2025

• #10

The front sunroof drains definitely run down the A pillars, there is a right-angle grommet it pushes into that exits through the inner wing, roughly in line with the air intake.