Member Since: 30 Jun 2015
Location: Geneva
Posts: 1
Cruise control not working
Hi all, I hope someone can help,
I have a Defender TD5 from 1999. The ECU Part number is NNN500020 (I bought it like this, I suspect it was done by the garage under warranty)
I wired the cruise control switches (pins 10, 11, 15 and 17) - it's not working.
Inputs:
Brake Switch 1: OFF
Brake Switch 2: ON -> OFF if I apply 12V to pin 10 together with pin 15
Clutch Switch: OFF
Cruise Control: ON - when I apply 12V to pin 10 and 15
Cruise Resume: OFF -> ON if I apply 12V
Set Accelerate: OFF -> ON if I apply 12V
Instruments:
The Engine speed displays OK
The Road speed displays OK
I do have a 1.21 transfer box but it does not work in any gears (I would like to confirm it's working on the 4th before installing a "speed healer" device)
To try to make it work I accelerate in 4th past 40 KPH and apply 12V to pin 11 (SET). The Set Accelerate (in Nanocom) does turn ON but then goes back to OFF when I release the button and the car slows down. I tried to keep the switch pressed longer... no difference. I tried the same with Reset and nothing.
I did test properly the clutch and brake switch.
I also did a calculation of my speed vs. revs:
At 73 KPH I am doing 2154 revs in 4th (with my 1.21 TB).
From Ashcroft calculator I should be doing 2724 in 4th or 2126 in 5th (if I would still have a 1.41 TB).
So my 2154 revs in 4th are 98.7% close to theoretical 2126 in 5th which I would guess it's good enough.
Here is the diagram of my actual setup.
Just to cover all bases, here are the faults I get from the Nanocom:
NANOCOM - TD5ENG.APP - TD5 ENGINE fault file
(10,1) AIR CONDITIONING FAN DRIVE OPEN LOAD, (LOGGED).
---
(10,3) TACHOMETER DRIVE OPEN LOAD, (CURRENT).
---
(10,4) GEARBOX / ABS DRIVE OPEN LOAD, (LOGGED).
---
(10,5) AIR CONDITIONING CLUTCH DRIVE OPEN LOA D, (LOGGED).
---
(14,1) AIR CONDITIONING FAN DRIVE OPEN LOAD, (CURRENT).
---
(14,3) TACHOMETER DRIVE OPEN LOAD, (CURRENT).
---
(14,4) GEARBOX / ABS DRIVE OPEN LOAD, (CURRENT).
---
(14,5) AIR CONDITIONING CLUTCH DRIVE OPEN LOAD, (CURRENT).
---
(20,5) EGR VALVE STUCK CLOSED, (LOGGED).
---
(24,5) EGR VALVE STUCK CLOSED, (CURRENT).
---
The EGR is because I have installed the EGR removal kit. Can the GEARBOX / ABS DRIVE OPEN LOAD, (CURRENT) affect the CC? Is it possible that during the ECU upgrade the option was not disabled properly and the CC will not engage if the ABS is "present" and malfunctioning? Is there a way to check this with the Nanocom?
Is there anything else I should check? Are there any other conditions that must be met before the CC would work?
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