Bottom Row" - pins 1 to 13 (they're numbered from left to right as shown on the plug)
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 on the plug)
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, airflow & throttle-position sensors
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 on the plug)
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 (IF FITTED)
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

Note:
   1.  Where two colors are given, the first is the basic color and the second is a "stripe" or "tracer" color.
   2.  Pins 4, 23, 24, 30, and 31 were NOT USED on vehicles that weren't equipped with catalytic converters.