SuperSpec

SuperSpec

Tuesday, 12 November 2013

The 'Electrics' Project - Services

The next stage was a list of all the electrical ‘services’, annotated as to whether they used a ‘direct’ 12V supply or an ignition switched 12V, whether they ought to use a Relay (and if so which one), and which fuse they used. 
 (Red is unknown)
Service
12V
Colour
Relay
Fuse
Demisters
Ignition

Yes – Relay 1
3
Fog Lights
Direct
Blue/Yellow
Yes – Relay 2
4
Horn
Direct
Purple/Black
Yes – Relay 3
1
Headlights (Main)
Direct
Blue/Red
Apparently none
1
Headlights (Dipped)
Direct
Blue/White

Apparently none
1
Cooling Fan
Direct
???
Yes - Relay at Front
11
ECU
Ignition
Green/Pink
Yes - Not found
?
Lamda Sensor
Ignition
Green
Yes - Relay 4
?
Fuel Pump
Ignition
White
Yes - Relay 5
?
Indicators
Ignition
Green/White
Yes – Flasher Relay
?
Hazards
Direct
Green/White
Yes – Flasher Relay
?










Sidelights
Direct
Red
No
4
Number Plate Light
Direct
Red
No
4
Reversing Lights
Direct
???
No
10
Brake Lights
Ignition
Green/Purple
No
4
Cluster Illumination
Ignition
Red
No
4
Instruments
Ignition
Green
No
2
Warning Lights
Ignition
Green
No
2
Wipers
Ignition
Blue/Yellow
No
?
Washers
Ignition
Green/Black
No
?

Instrument Panel Wiring
 
Just for completeness I figured out the Instrument Panel wiring:  (Blue means Not used, Red means don’t know)


Pin
Colour
Usage
Black Plug
12
Red
+12V for Panel illumination
11
Blue/White
Headlight Full Beam Warning
10
Black
Earth for Headlamp Warning and Panel Illumination
9
Not Used
(ABS warning light)
8
Black/Yellow
Handbrake/Brake Fluid Level Warning Light
7
White/Green
‘S’ Connector on Temperature Gauge (Sender)
6
White
‘S’ Connector on Fuel Gauge (Sender)
5
Black
‘E’ (Earth) (Earth) for Fuel and Temperature Gauge
4
Not Used
(Diesel GlowPlug)
3
Not Used
(Washer Fluid Level)
2
Not Used
(Low Fuel)
1
Green
12V for lamps and ‘B+’ on Fuel & Temperature
Blue Plug
1
Black
Earth for Indicator Lights
2
????*
Indicator Lights
3
Not Used
(Windows ??)
4
Not Used
(?????)
5
Not Used
(Seat Belt)
6
?????*
From Negative Side of Coil (not connected on board ?)**
7
Brown/Yellow
Alternator Warning Light
8
?????*
‘E’ on Tachometer (from +ve side of coil)
9
?????*
‘S’ on Tachometer
10
White/Brown
Oil Pressure Warning
11
Not Used
(Rear Screen Heater)
12
Green
‘B’ on Tacho (12V ignition switched)



*      I will be able to complete the colour column when I remove the centre dashboard.

**    The wiring diagram says to connect to coil but on PCB on back of cluster it doesn’t appear to be connected to anything.

LAMDA SENSOR

Not something I have seen before so needed to figure out the wiring.  Seems it is:


Sensor
Engine Plug
Function
White*
Black (Earth)
Heater
White*
Brown/Blue (Power)
Heater
Grey
Green
Signal
Black
Grey
Earth


The 2 White wires are interchangeable

ECU

The Electronic Control Unit is a ‘black box’, but I did find a breakdown of the connections:


Pin
Colour
Function or Termination
Comments
1
White/Yellow
Coil -ve
Not Used
2
Pink/Blue
Stepper Motor Phase 2

3
Orange/Grey
Stepper Motor Phase 1

4
White/Pink
Feed from main ECU relay
-ve side of Switching Circuit
5
Not Used
Air Con Control

6
Not Used
Cooling Fan Relay

7
Grey
Lambda sensor +
Revised wiring extension
8
Yellow/Green
Throttle Sensor Supply

9
Yellow/Purple
Throttle Sensor Input

10
Pink
Diagnostics Output

11
Green/Pink
Ignition Sensing

12
Not Used
Electronic Tacho Output

13
Black/White
Immobiliser Control
Disabled
14
Not Used
??

15
Not Used
Air Con Control

16
Green/Black
Air Temp Sensor Input

17
Yellow
Engine Knock Sensor

18
Light Green
Lambda sensor -

19
Not Used
Air Con Control

20
Black/Purple
Fuel Cut off Relay Control.
-ve side of Switching Circuit
21
Yellow/Orange
Boost Purge Valve

22
Orange/Green
Stepper Motor Phase 3

23
Yellow/Green
Injector 1-4

24
Yellow/Blue
Injector 2-3

25
White/Black
Coil +
Actually to Coil -ve
26
Not Used
Cruise Control

27
Orange/Blue
Stepper Motor Phase 4

28
Brown/Pink
+12V Power
+ve Power circuit from Relay
29
Black
ECU Earth

30
Pink/Black
Engine Sensors Earth

31
Blue
Crankshaft Sensor +

32
White
Crankshaft Sensor -

33
Pink/Green
Coolant Sensor Input

34
Grey/Pink
Fuel Rail Sensor Input

35
Not Used
Air Con Control

36
Black/Green
Lambda Sensor
-ve side of Switching Circuit

 

LIGHTING CIRCUIT


Pin 30 on both relays get a permanent +12 V Power Supply from Fuse 1

Pin 87 on the relays goes to Main Beam (Blue/White) and Dipped Beam (Blue/Red)


Light Switch gets Direct Power from Fuse 1.  

Position 1 sends power to sidelights through (Red/Grey)

Position 2 sends power to High/Dip Switch which feeds Pin 85 of appropriate relay


Pins 86 get fed an ignition switched earth feed    (Apparently not, seems to be permanent earth?)    

Status:   Lots to do, I still have the following outstanding questions 

1.  Where is the relay for the Lamda Sensor Heater ?
2.  What are Fuses 5-9 for ? 
3.  Where are the fuses for the indicators and wipers/washers ?


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