Morgan/Rover Diagnostic ("Fault") Codes for HOTWIRE SYSTEMS  (1991 -2000 in the UK and 1991 to 1996 in the US)
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.

PINS AND WHAT THEY GO TO

"Bottom Row" - pins 1 to 13 (they're numbered from left to right as shown in the photo)

1 Red/Green Idle bypass valve - circuit 1
2 Brown/Orange Power feed to the fuel injection main relay
3 Yellow Throttle position sensor output/reference - see also 20 and 25
4 Black Oxygen sensors (ground) and to the relay that powers their heater coils
5 Grey/Black Tune resistor (through VIN LA451517 only)
6. Yellow Road speed input
7 Green/Blue Coolant temperature sensor (input) - see also 25
8 Purple/Yellow Windshield defroster input, if fitted
9 White/Light Green Diagnostic connector output
10 Black/Yellow "Check Engine" lamp
11 Yellow/White Right bank of injectors - cylinders 2, 4, 6 and 8
12 Blue/Red Main relay "request"
13 Yellow/Blue Left bank of injectors - cylinders 1, 3, 5 and 7

"Middle Row" - pins 14 to 27 (they're numbered from right to left as shown in the photo)

14 Black Ground
15 Brown "Battery" supply
16 Blue/Purple Fuel pump relay "request"
17 Grey/Yellow Purge control valve output
18 White/Pink Diagnostic connector output
19 White/Grey "Ignition" supply
20 Red Throttle position sensor (input) - see also 3 and 25
21 Yellow/Black Air conditioning thermostat input, if fitted
22 Blue/Red Air flow sensor (input) - see also 25
23 Blue Signal from the LH oxygen sensor
24 Blue Signal from the RH oxygen sensor
25 Red/Black Ground side of coolant, fuel
26 Green/White Idle bypass valve - circuit 1
27 Black/Grey Ground

"Top Row" - pins 28 to 40 (they're numbered from left to right as shown in the photo)

28 Blue/Grey Idle bypass valve - circuit 2
29 Orange Idle bypass valve - circuit 2
30 Black Fault display data
31 Black/Green Diagnostic connector "request" input
32 Grey/White Fuel temperature sensor (input) - see also 25
33 Black/Grey Air conditioning compressor clutch relay, if fitted
34 Orange/Black Transmission gear switch signal
35 Blue/Green Air flow sensor (input) - see also 25
36 Black/Green Air conditioning condenser fan output, if fitted
37 (Not Used)
38 Brown/Black Fault display data
39 White/Black Engine speed signal cable (harness includes 6.8k ohm resistor)
40 Black Ground