SuperSpec

SuperSpec

Saturday, 30 November 2013

To SORN or not to SORN

Now that the summer is finished and the weather is getting poor the big decision for all kit car owners comes around.   Should you take the car off the road and do all those jobs that have been stacking up over the summer.  Or do you brave the cold weather and continue to drive the car over the winter.

My decision:    Keep her running and just wrap up warmly.

Wednesday, 27 November 2013

Dashboard Project - Phase Four

The next stage was covering the gear lever housing and transmission tunnel in vinyl to match, and I took the opportunity to fit a nice chrome surrounded gear lever mounting of a Ford Fiesta.


For my birthday I treated myself to a new set of warning lights that actually have the correct symbols displayed. So far they are: Cooling fan, Alternator, Oil Pressure and Indicators. I have also got ones for Headlight Full Beam and Handbrake Warning, which are still to be fitted. 


Status: - Getting there slowly, just centre console left.

Saturday, 23 November 2013

Battery Isolation Switch

I got sick and tired of disconnecting/reconnecting the battery while I was testing the electrics so I fitted a Battery isolation switch.

For those that don't know, if you remove that red key the car is then completely dead electrically and will not start. It's official purpose is to make it more difficult to steal so that might come in useful if I ever have to leave it somewhere. 


Although you can buy those keys for £1.50 off E-Bay so I guess a professional thief would carry one around with him, 

But it would deter the casual thief and stop those people who think it is clever to reach in and turn on the hazard warning lights to drain the battery. 

Status: Complete

Saturday, 16 November 2013

The Starting Problem

There are a few thoughts on why the engine struggles to crank when you try and start a hot engine: 

1. The engine itself ‘tightens’ up when it is warm, making it difficult to turn over. 

2. Advice on the forum is that the absence of a decent earth strap from engine to chassis can cause a voltage drop.

3. If the ignition advance is too much it would make it difficult to turn over. 

There is nothing I can about (1), and (3) is controlled by the ECU, so all I can do is fit a proper earth strap and hope it helps. 

Here it is: 









I also decided to add a voltmeter into the circuit so I could see if the battery was struggling. I didn't want it to be a permanent distraction so mounted it on the auxiliary electrical panel where it can easily be viewed when troubleshooting. 


As you can see, at 12.5V it is quite healthy. When the ignition is switched on it drops to 12.3V, which is fair. If you turn on a high-power system like the demisters or the headlights then it drops to 11.8V, not unexpected. Once the engine is running it shows 14.1V which means the alternator is charging it well. 

The only slight concern is that while cranking it initially drops to 9V before recovering to 9.8V. That is marginal. Something to keep an eye on. 

Update:   March 2014 - Now had a chance to try a hot start and everything was fine.  See "Sunday Run with Hot Start"

Status: Complete

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 ?