Tune Resistor - ECU Mate "Limp No CATS"

[blitzracing]

I dont know- but if its a 5AM there is a good chance, but it might not have the CO trim resistor like the Jag unit.

[Anetos]

Thank you

[Anetos]

I get one original 3am air flow meter. Both air flow previous and original has a reading on earth wire 0.4V not zero is that normal?

[blitzracing]

The standby voltage is not important- the time of the warm up spike to near 5 volts that should be less than 1 second, and the idle voltage of about 1.6 volts for a 3.9 is what you are looking for.

[Anetos]

thank you

I started to use the rovergauge software and i saw on selected gear (Auto ) mine is manual transmition with out speed sensor .
I need to place a resistor (510ohm) or leave it us it is?

[blitzracing]

This setting only controls the idle speed to allow the ECU to alter the idle by about 100 rpm as you put the car into drive. It wont affect the mixture or running of the car beyond that - so I would not spend too much time on this. Heres a breakdown of the auto switch if you do want to test it further: (From the excellent fault finding guide on the ACT web site:

http://www.actproducts.co.uk/2011/lucas-14cux-fuel...



Inhibitor Switch Sense – Manual and Automatic Transmission

The ECU uses this inhibitor switch signal to know whether it is managing a vehicle with a manual or an automatic transmission. For an automatic transmission, the ECU needs to know whether the car is in gear or not.



For cars with a manual transmission, this signal is connected to chassis ground via a 510 Ohm resistor. With automatic transmission it is connected to the inhibitor switch. In this case the signal is grounded when the transmission shifter is in the Park or Neutral positions. In gear the signal is allowed to float up, which means 5 Volts normally.



The inhibitor switch signal appears on the orange/black wire at the main connector where the fuel injection loom plugs into the vehicle body loom. Obviously the location of this plug varies between models of vehicle. In general for Land Rover vehicles it is at the top of the right-hand foot well (viewed from the driver’s seat) next to the transmission tunnel.



This signal is tested by monitoring the Orange/Black wire with the positive probe of a Voltmeter, with the negative probe connected to a good chassis ground. Switch on the ignition and observe the reading. For a manual transmission, this should be approximately 2.5 Volts. With automatic transmission, the reading should be 0 Volts with the shifter in Park or Neutral, and 5 Volts in gear.

[Anetos]

Hi again if the lambda proves are missing ( i had cut the wires and hide them on the loom ) but i use green tune will be a problem on running rich?

[stevesprint]

Green fuel maps tend to be richer than white cat maps but you could try reducing the fuel by turning the CO Trim on a AFM anti-clockwise which adjusts the fuel mixture upto 3,400rpm for non cats maps only. If that doesn’t help I could try helping by copying the cat map fuel data to the non cat fuel map for you.

What’s your Tune number and checksum fixer in RoverGauge?

Edited by stevesprint on Monday 23 March 21:23

[Anetos]

[Anetos]

Checksum A9 tune :R3383 fuel map 2.

[Anetos]

The above table is ok or there is a problem
thank you

[davep]

Anetos said:

The above table is ok or there is a problem
thank you

All looks OK for a Land Rover 3.9/4.2 R3383 tune running on Map 2, apart from the Selected gear error.

Was the ECU you are currently running on the 3.9 (R3383 tune, Fuel Map 2 (Green)) sourced from the original engine with a 3.5 displacement?

Can I suggest you download and run the latest version of RoverGauge 0.10.7, this will show the engine RPM thresholds in the fuel map's header row. Land Rover's Fuel Map 2s have a high RPM safety limit of 8561 rpm, whereas Fuel Map 5s are limited to 5403 rpm.

You should have Fault Code 69 set for a Neutral Switch Fault. RoverGauge is showing Park/Neutral so the gearbox sense voltage on ECU connector pin 34 is approx. 0V (probably open circuit) but should be approx. 2.5V for a manual transmission. This means the ECU has to waste time checking a load of other parameters before deciding whether to set a fault code or not.

[mikanel]

I had a similar problem last year where the ecumate didn't recognise the tune resistor fitted even though I could measure the correct resistance at the ecu multiplug, following a lot of help from the forum, eventually I found the tune resistor connector was in poor condition so cut it off and soldered the resistor in, end of problem, ecumate immediately showed the correct map selected.

Mike

[Richieboy3008]

Richieboy3008 said:

No cats you say? Scare the dog away and they'll come back!

Did you try this?

[Anetos]

today i change stepper motor