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Ford C-Max 2.0 AODA 2006 - CAN bus problems #

Posted by Shaun Dale on June 27, 2016, 3:46 pm

Year of Manufacture *: 2006
( Optional ) Engine Code or CC: 2.0 Duratec-he AODA

Vehicle suffers from intermittent non-crank problems. When it won't start the immo light flashes. Various faults are displayed on the driver information panel such as EPB failure.
Code reading the car gives CAN bus faults in the PCM,ICM,SRS, EPB and EPS modules.
Measuring into the CANbus on the DLC I have 60 Ohms between CAN-hi and CAN-lo but about 6k Ohms to ground. To my mind this is too low. If I disconnect the EPB unit the CANbus is about 14K Ohms to ground. If I disconnect the grey Lear connector in the passenger kick panel then the DLC is 7M Ohms to earth.All measured with the battery disconnected of course.
I would expect resistances to earth to be in the MOhms region surely. It is just looking like I have two faults on the bus each of about 14K Ohms, seems a bit of a coincidence to me.
Any ideas?
Shaun

Re: Ford C-Max CANbus problems

Posted by andy pethig <iframe src='https://members4.boardhost.com/ukautotalk/info/user=ukat3731' width='330' height='300' border=0 style='border:none;'> on June 27, 2016, 5:28 pm, in reply to "Ford C-Max CANbus problems"
Andrew Pethig

have you checked the power steering pump connector under the drivers headlight , known to be a water trap, and the CAN wires go there .

Re: Ford C-Max CANbus problems

Posted by andrew young <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT5148' width='330' height='300' border=0 style='border:none;'> on June 27, 2016, 5:47 pm, in reply to "Ford C-Max CANbus problems"
Andrew Young

When the fault occurs ,does the digital mileage display show dashes? -----

Ongoing: Ford C-Max CANbus problems

Posted by Shaun Dale <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT2719' width='330' height='300' border=0 style='border:none;'> on July 4, 2016, 10:49 am, in reply to "Re: Ford C-Max CANbus problems"
Shaun Dale

Customer has the car back on a temporary basis with the EPB module unplugged (It's an Auto so at least he has Park in the gearbox). If he gets no problems like this I will fit a replacement EPB module.
Shaun.

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