RRC On board Diagnostic Display

[gavinwibrow]

I have been given of these, but as I don't have a V8 a, and have a Nanocom, it is not much use to me. Anyone interested eg Baggy?

Full article at Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting (http://www.britishv8.org/Articles/Rover-14CUX-EFI.htm)

https://www.aulro.com/afvb/images/imported/2017/05/227.jpg

Fuel Injection Fault Display

The fuel injection fault display provides two-digit diagnostic codes in a way that's very easy to read: the display has a dark red, transparent, molded plastic case. Light emitting diodes can be seen through the side of the case when a fault code is displayed. Nifty!

If multiple faults exist, the display shows the one that the ECU thinks is highest priority. Higher priority faults need to be "cleared" before lower priority faults will be displayed. A "blank" (dark) display usually indicates there are no faults.

Use this procedure to clear faults:
1. Switch "on" the ignition.
2. Disconnect the serial link mating plug, wait five seconds, and reconnect.
3. Switch "off" the ignition, and wait several seconds.
4. Switch "on" the ignition. The display should now reset.
Note: It should either show a lower priority fault code or appear dark.



Rover Diagnostic ("Fault") Codes


12
Mass airflow (MAF) sensor or MAF sensor circuit


14
Coolant temperature sensor (CTS)


15
Fuel temperature sensor (FTS)


17
Throttle position sensor (TPS)


18
Throttle position sensor (TPS)


19
Throttle position sensor (TPS)


21
Tune resistor (open circuit)


23
Fuel system pressure


25
Ignition misfire


28
Air leak


29
Electronic control module (ECM) memory check


34
Injector (or its wiring) - cylinder bank "A"


36
Injector (or its wiring) - cylinder bank "B"


40
Misfire - cylinder bank "A"


44
Oxygen sensor - cylinder bank "A"


45
Oxygen sensor - cylinder bank "B"


48
Idle air control valve (also check the idle speed and road speed sensor)


50
Misfire - cylinder bank "B"


59
"group fault" (it's either an air leak or a fuel supply problem)


68
Vehicle speed sensor (VSS)


69
Gear selector switch


88
Carbon filter solenoid valve ("purge valve") leak







Note: Fault code "02" will appear after a disconnected ECU is reconnected. Simply switch on the ignition to clear the display.

The Fuel Injection Fault Display on our example system is marked "Land Rover", "Range Rover On Board Diagnostic Display", "PRC", "7067", "17EM", "85008A", and "3589". It has a 4-lead pigtail on it that's about 18" long, and the 5-pin connector on the end of the pigtail is unmarked except for terminal cavity numbers.

The wires are connected as follows: 1 - Brown/Orange, 2 - Black/Grey, 3 - Pink, 4 - Not Used, and 5 - Brown/White.

[Davo]

Yes, I could use it if it's no good to you. I was just reading up on the 14CUX system and wondered if these things were still around.

[Chivalry]

I would also be interested

[PhilipA]

My 91 did not have the appropriate plug for this reader in the loom. There was a plug under the seat but it was not for the reader.
I was able to bodgey up a set of connectors to use the display which I bought form a wrecker in the USA by taking fly leads from the big 40 pin plug and from the cigarette lighter for the power.

I cannot remember now which pins go to which but a wiring diagram somewhere sets it out.

Funny I never had a fault, although I would test the display by removing the MAF plug which would then throw a fault. It is of limited value unless you have fitted O2 sensors as the diagnostic function is much enhanced by the presence and wiring in of O2 sensors.

Regards Philip A

[bikeman]

I know I'm a bit late but if it is still available , I am very interested.
phil

[gavinwibrow]

Just waiting on whether Baggie wants it. If not, Davo in Derby was the next cab off the rank and will be getting a wee parcel unless he passes after reading the other comments in this thread about fitting oxygen sensors for the full benefit.
Cheers Gavin

[Davo]

Thanks for the update. I'll keep an eye on this thread in case it comes up.

[Baggy]

Hi Gavin,

Thanks for the offer.

Can anyone tell me where the approperate plug is located on my 1992 Rangie ....

Ill check if I have the plug .... if so I'll happily take it off your hands ....any assistance in diagnosing a fault in the "Lucas Prince of darkness"
electrics of a Rangie is appreciated.

If not I'm happy for you to pass it along to Davo in Derby.


Cheers


Baggy

[PhilipA]

Can anyone tell me where the approperate plug is located on my 1992 Rangie .

I don't think you will have one. There may be a plug under the seat but it is different to the plug needed as it is for a dealer diagnostic reader. AFAIR it only has 2 wires to it not 4. 2 of the wires to the display are 12v and earth..

The readers were only for US spec vehicles , and they had o2 sensors and additional wiring for them.

If you want o2 sensors I have written a how to long ago but I still have it as a pdf.
Regards Philip A

[Baggy]

Hi All,

PhillipA ...Thanks for your post .....

I've been away from the Forum this week as we've had early starts for work in the city.

I thought I'd seen a empty plug in the engine bay that looked similar to Gavins photo ... although the previous owner may have just removed / disconnected
any number of original factory fitted options.

He's removed the air bag suspension - (although the spring set up he's done retains that comfortable ride) replaced transfer box and auto ....removed fluid level warning plug on overflow bottle ....
which I would have kept unless like most Lucas electrical it was unreliable.

I'll check this weekend and post my results.

Cheers

Baggy

[PhilipA]

I thought I'd seen a empty plug in the engine bay that looked similar to Gavins photo
No AFAIK that is also a dealer diagnostic plug.
The display shown sits under the drivers seat in US spec vehicles and is connected near the 40 pin plug to the ECU. But the plug in my 91 anyway was not the correct plug, much to my annoyance.

Regards Philip A