LAND ROVER DIAGNOSTIC CODE READER (already fitted to ISIS Imports sourced 14CUX Plus 8s in the US but none other)
by Lorne Goldman

The fuel injection fault display can normally be found at the rear of the glovebox on US 14CUX Plus 8s. It provides two-digit diagnostic codes in a way that's very easy to read if you know how it works. 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.

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 (black) display usually indicates there are no faults..(which makes people think it is not working!).

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 then either show a lower priority fault code or appear dark. 

MORGAN MOTOR COMPANY DIAGNOSTIC CODE READER
by Lorne Goldman

The early unit of these was quite flexible. It can read (and reset) all readable Morgan EFI systems until 2004. Only a few were made. It comes with a close-to-incomprehensible manual (sad smile) and plugs to interface with old relevant models using Ford, Rover or Land Rover or BMW.

14CUX PLUS 8 & PLUS 4 HOTWIRE FAULT CODES
 

Switch ignition on.  Disconnect serial link mating plug, wait 5 seconds, then reconnect.  Switch ignition off and wait for main relay to drop out. Switch ignition on. The display should now be reset. If there are other faults, the next one will be displayed. Otherwise the display will be black.  If there is more than one fault repeat these steps to clear each fault until the display is blank. If you clear a code without performing a repair it (and the EFI light) may or may not return. Some codes are set by intermittent conditions that do not occur often. Other codes signal serious faults that are detected immediately upon startup.
FAULT CODE
FAULT DESCRIPTION
 ACTION
Nothing shown on display  Either nothing is wrong (most likely) or the display is broken
2 Power interruption This code means power to the ECU has been disconnected and the car has not yet been started. This code should go away as soon as the vehicle is started for the first time. Appearance of this code while driving may signal a problem within the ECU.
12 mass airflow sensor Usually signals a problem with the airflow meter or the connector which can fall apart or become damaged. Use correct continuity test procedure.
TEST
14
engine coolant temp THERMISTER
 TEST
15
engine fuel temp sensor
 TEST
17
Throttle position sensor
 Usually indicates a problem. Refer to the correct continuity tests TEST
18
high throttle positition vs. low mass airflow readings
 Usually indicates a problem. Refer to the correct continuity tests TEST
19
  low throttle position reading vs. a high mass airflow readout Usually indicates a problem. Refer to the correct continuity tests TEST
21
tune resistor fault
 Identifies that the tune resistor is open circuit-refer to tune resistor test. The tune resistor is embedded in the wire harness. This code may indicate it is damaged. TEST
23
fuel supply fault
 Check fuel system pressure and the appropriate continuity test.TEST
25 Ignition misfire This code indicates that an ignition system misfire has been detected. Codes 40 or 50 indicate on which bank the misfire has occurred.
28
engine air leak
 One way to check for small leaks is by spraying choke cleaner (aka ether) at the joint you want to check while the motor is idling. A change in tone indicates the choke cleaner is being sucked into the engine. Check for air leaks in the following areas: 

        Hose, air flow meter to plenum
        Breather system hoses to plenum
        Brake servo hose
        Vacuum reservoir hose (fresh air solenoid)
        Distributor vacuum advance
        Hose, purge valce to plenum
        Injector seals
        Joint - bypass air valve to plenum plenum chamber to ram housing ram housing to inlet manifold inlet manifold to cylinder head bypass air valve
 
29
 ECM memory fault (if code 29 is showing any other codes are unreliable and must be ignored). If this code appears all other faults are unreliable and must be ignored. Use the procedure below to clear the code and see if it re-appears. If it does, your ECU is almost certainly bad.
    Procedure: 
        leave battery connected
        switch ignition off
        wait for approximately 5 seconds
        disconnect ECU plug.
        reconnect ECU plug
        switch ignition on and check display unit.
If fault code 29 is detected again, swap out the ECU for another and retest.
34
  left bank injector fault The display will indicate if the injector(s) are causing the engine to run rich or lean.
    If the bank is running rich, check for - faulty injector wiring and connectors, stuck open injectors.
    If the bank is running lean, check for - faulty injector wiring and connectors, blocked injectors. TEST
36
 right bank injector fault
 As code 34, except relevant to bank A injectors. TEST
40   left bank misfire  If one fault code 40 or 50 is displayed check components applicable to the particular bank that the misfire has occurred on:

        Spark plugs
        Ignition leads
        Distributor cap
        Injectors - if code 34 bank A or 36 bank B displayed

    If both codes are displayed, check the following components common to both banks:

        Distributor cap
        Distributor rotor
        Coil and its associated connections
        Distributor pick-up (air gap)
        Amplifier
        Injectors (if code 34 or 36 is displayed)
44
 left bank headed O2 sensor fault
 If one of these fault codes (#44 or #45) is displayed check the wiring to that particular lambda sensor. In addition this fault will be displayed if the vehicle has a condition which causes it to run very lean or very rich on one side (example - a vacuum leak or a bad injector). This code often appears in conjunction with the misfire codes in cases of bad ignition misfire (cross-firing plug wires)
    If both codes are displayed, the voltage supply to the heater coils of the sensors must be checked. Check for 12V appearing on the O2 signal lead, and check the heater circuit for shorts.  TEST
 45
  right bank heated O2 sensor fault
 If one of these fault codes (#44 or #45) is displayed check the wiring to that particular lambda sensor. In addition this fault will be displayed if the vehicle has a condition which causes it to run very lean or very rich on one side (example - a vacuum leak or a bad injector). This code often appears in conjunction with the misfire codes in cases of bad ignition misfire (cross-firing plug wires)
    If both codes are displayed, the voltage supply to the heater coils of the sensors must be checked. Check for 12V appearing on the O2 signal lead, and check the heater circuit for shorts. TEST
 48
  idle air control valve fault (IAVC) aka Stepper Motor
  TEST
 50
right bank misfire
 If one fault code 40 or 50 is displayed check components applicable to the particular bank that the misfire has occurred on:

        Spark plugs
        Ignition leads
        Distributor cap
        Injectors - if code 34 bank A or 36 bank B displayed

    If both codes are displayed, check the following components common to both banks:

        Distributor cap
        Distributor rotor
        Coil and its associated connections
        Distributor pick-up (air gap)
        Amplifier
        Injectors (if code 34 or 36 is displayed)
58 Group faults 23/28 This indicates that a fault has been registered that is caused by the fuel supply or an air leak but the exact fault cannot be identified. Check all items outlined under codes 23 and 28.
 59
  Fuel thermistor
 TEST
 68
Road speed sensor
 TEST
 88
canister purge valve leak
  Refer to test 9 and 10 of the continuity test procedure. TEST