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LandymanStefan

Member Since: 30 Aug 2017
Location: Surrey
Posts: 881

I do have one type somewhere but can't remember of the top of my head what resistance it was? What resistance do I need?

And when you say poke it in the connector do you mean poke one end in the grey and one end in the black then measure the voltage across the resistor legs?

21st Aug 2018 5:36pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

CAI/Smiths have tachometers that work with ECU output and require
resistive load to work units have resistors in cct witch can switch in or out

21st Aug 2018 6:42pm

LandymanStefan

Member Since: 30 Aug 2017
Location: Surrey
Posts: 881

You lost me here ' units have resistors in cct witch can switch in or out'

21st Aug 2018 6:59pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2237

2002 Defender 110 Td5 DCPU Keswick Green

I thought the TD5 ECU outputs a 50% duty cycle square wave with a peak amplitude of 5V not 12V as CAI email implies??

Steve 02' 110 TD5 Double Cab Rebuild Thread

21st Aug 2018 7:13pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2237

Does Clive have an ABS unit connected which could be performing the function of the pull-up circuit? If he has ABS and noone else has who is trying that might explain the discrepancy. CAI's test vehicle may have too.

Steve 02' 110 TD5 Double Cab Rebuild Thread

21st Aug 2018 7:17pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6613

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

You need a resistor of a few Kilohms between the signal wire (the White/Slate down to the ECU) and the 12V supply (ignition supply NOT illumination!)

The Td5 ECU does have a programmable option for the rev counter but I've never heard of it being off.

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Aug 2018 7:20pm

LandymanStefan

Member Since: 30 Aug 2017
Location: Surrey
Posts: 881

Rallysteve that does sound logical! We'll have to wait and see what the others say.

Martin so do you mean have everything connected and squeeze the resistor between the signal cable and the green switched live then fire up the car and see what happens? If so I'll give that a go on the weekend. 👍

21st Aug 2018 7:27pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6613

Yes, all connected up, add the resistor into the wire side of the connector if you can.

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Aug 2018 7:40pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

LandymanStefan wrote:
You lost me here ' units have resistors in cct witch can switch in or out'

Click image to enlarge

21st Aug 2018 8:12pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6613

That PDF says Petrol Engines Only

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Aug 2018 8:16pm

Clive

Member Since: 21 Mar 2014
Location: Littleborough
Posts: 467

2004 Defender 90 Td5 X-Tech LE Zambezi Silver

rallysteve wrote:
Does Clive have an ABS unit connected which could be performing the function of the pull-up circuit? If he has ABS and noone else has who is trying that might explain the discrepancy. CAI's test vehicle may have too.

Steve

Yes, I do have ABS on my 90, I questioned the same thing myself a few posts back.

I also checked the ECU configuration earlier and found the tachometer output IS enabled, as Martin says though, this is probably the case with all of them, in much the same way that some other functions are enabled by default whether they're fitted or not.

Click image to enlarge

I can also confirm that the ECU tacho output IS 12v and not 5v, I checked this with an oscilloscope to be certain.

21st Aug 2018 8:31pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6613

How have you guys wired these up?

Can't find instructions online specific to the Td5 version (Clive mentions a lot earlier about instructions mentioning ABS and pre/post 2002 models).

Anyway,

What wires are left over after connecting up as instructed?

Do you have a brown/slate one left over?

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Aug 2018 9:15pm

Clive

Member Since: 21 Mar 2014
Location: Littleborough
Posts: 467

I had two wires left over, a red and a red/blue.

21st Aug 2018 9:52pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2237

Clive wrote:
rallysteve wrote:
Does Clive have an ABS unit connected which could be performing the function of the pull-up circuit? If he has ABS and noone else has who is trying that might explain the discrepancy. CAI's test vehicle may have too.

Steve

Yes, I do have ABS on my 90, I questioned the same thing myself a few posts back.

I also checked the ECU configuration earlier and found the tachometer output IS enabled, as Martin says though, this is probably the case with all of them, in much the same way that some other functions are enabled by default whether they're fitted or not.

I can also confirm that the ECU tacho output IS 12v and not 5v, I checked this with an oscilloscope to be certain.

Sorry Clive, missed that post!

Steve 02' 110 TD5 Double Cab Rebuild Thread

22nd Aug 2018 7:31am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Martin wrote:
That PDF says Petrol Engines Only

I no, just show that resistors in cct witch can switch in or out on models that they make

22nd Aug 2018 8:05am

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