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Wiring CA18DET engine and ECU with CA18DE wiring loom

By Carl Rickards (dattofiend)

dattofiend@pnc.com.au

 

I decided to document something for those of you wondering about wiring in your CA18DET motor into your existing EXA wiring loom, as when I did it it was more of a word of mouth thing.

 

Iím not sure how much of this will be different for FWD motors if any, but I used a RWD s13 Silvia motor for my conversion. If you have any questions about this conversion, you can get in touch with me on the above email or thru nissanexa.com pmís. There are a few others on the forum who have also done the conversion who can give advice.

 

Hereís what needs to be done:

 

 

You will need:

 

 

Installing new injector plugs and dropping resistors

 

The CA18DE injector plugs will not fit properly on to the CA18DET injectors, so we have to fit new plugs on to the loom. We also have to wire resistors into the loom because the DET motor uses low impendance injectors. Working one by one, follow these steps to wire in the new plugs and resistors:

 

1.    Cut the loom close to the old injector plug, leaving a bit so you can identify which side to wire into.

2.    Remove old heat shrink tubing around the two wires, either pull it all off or strip it back.

3.    For all except injector 4, you will have one coloured wire and one black wire. We have to wire the resistor into the coloured wire. On injector 4, you have two black wires but one has different markings on it (I think it has two orange squares instead of one about every 6 inches) to the black wires on the other injectors. This is the wire to add the resistor into for Injector 4.

4.    Cut off a short length of speaker wire, roughly enough to go from where you have cut the wires to the injector. Strip back the wires on one end of it.

5.    Crimp the wires on to the pins for the new injector plug. I soldered here as well. Push the pins into the new plug, and slide the rubber boot on from the other end of the wire.

6.    Identify using the old injector plug, which side of the plug should be the earth wire. Then slide some heatshrink tubing onto the black wire on the loom, take the corresponding earth wire from your new injector plug, and solder it to the black wire on the loom. Slide the heatshrink tube up over the connection and heat with gas match or pencil torch until it shrinks tight.

7.    Cut about 4 cm off the coloured wire on the loom to allow for the resistor to go here. Strip back and solder one end of the resistor to the loom. Then solder the other end of the resistor to the remaining wire coming from the loom plug. Electrical tape over the connections, and then put loom tube over the wires from the injector plug back to the loom.

8.    Put the new plug on the injector (you need to put a bit of pressure on there so it clicks on properly) and youíre done! Repeat for the other 3 injectors.

 

Extension of wires to AAC valve

 

This is a very simple process, just using the same wire as you used to extend the injector loom, cut into the wires, measure how much you need to add, and soldering/heatshrinking or using crimp connectors, add in the new piece of wire making sure you link up the wire on the loom to the corresponding wire coming from the AAC valve plug. Insulate well and cover with loom tube for neatness.

 

Converting from CA18DE ECU to CA18DET ECU

 

This is for sure the biggest job that has to be done here. It took me about 5 hours to do. Basically what we have to do is one by one, cut the wires going to the pins in the 4 CA18DE ECU plugs and connect them into the wires from the corresponding pins in the CA18DET ECU plug. Itís really not that difficult or as daunting as it sounds as long as you take your time and go one by one. Ok hereís the diagrams of the pinouts of the plugs, and the table that shows where to connect them!

 

CA18DE (EXA) ECU plug pinouts. I know this diagram is a bit hard to make out, but if you look closely you will see that the pins go in sequence, starting from the bottom right on the second plug down they go 1, 2, 3, etc. to the top and then up the other side, leaving out the pins marked with an X which have no wires coming from them. If anyone has a better resolution diagram of this, could you please e-mail it to me and I will update this.

 

Please note that here we are looking at the front of the plugs, not the back where the wires go in.

 

 

 

 

 

 

 

 

 



CA18DET (s13) ECU plug pinouts. I donít know if this is the same for all CA18DET engines, so you should check the factory manual for your model to confirm that it corresponds with this before following the table below. Also note that here we are looking at the pins on the ECU itself, not the front of the plug. This means that this will correspond with where the wires come out of the back of the plug. Look at the plug and ECU when you get them and you will see what I mean.

 

 

ECU pinouts for N13 Exa and S13 Silvia

CA18DE and CA18DET

 

 

 

CA18DET

CA18DE

Description

Silvia Pin

Exa Pin

 

 

 

 

1

1

Coil pack 1 output (via power transistor)

2

2

Coil pack 2 output (via power transistor)

3

8

Coil pack 3 output (via power transistor)

5

11

Boost pressure control solenoid

6

10

A/C relay

7

3

Tacho drive output

8

 

Variable intake butterfly control solenoid

 

 

domestic Japanese cars only

10

6

Ground

11

9

Coil pack 4 output (via power transistor)

16

4

ECCS relay (earth = on)

17

 

Injector pulse duty output (not on exa)

18

104

Fuel pump relay (earth = on)

20

12

Ground

23

28

Knock/detonation sensor

26

16

AFM Pin B

27

15

AFM pin A

28

17

Coolant temp sensor

29

18

0xygen/Exhaust gas sensor

30

20+30

Sensor earth

32

 

Diagnostic computer connector

33

 

Diagnostic computer connector

37

27

AFM pin D

38

19

TPS potentiometer (throttle position sensor)

41

21

Crank Angle Sensor 180deg input

42

22

Crank Angle Sensor 1deg input

43

35

Start signal (cranking) from ign. Switch

44

36

Neutral switch

45

37

Ignition on

46

41

Thermo control for A/C

47

 

Diagnostic computer connector

48

38

TPS battery output

49

47

Battery from ECCS relay

50

40

Ground

51

31

CAS 180deg input backup

52

32

CAS 1deg input backup

53

33

Speed sensor

54

34

TPS idle (throttle idle position)

55

 

Ambient temp sensor (not on exa)

56

 

Auto trans control

57

44

TPS full throttle position

58

46

Battery unswitched

59

39

Battery from ECCS relay

60

48

Ground

101

101

Injector 1 drive output

103

103

Injector 3 drive output

106

113

AAC Auxiliary air control solenoid valve

107

107

Injector ground

108

108

Injector ground

109

109

Battery to/from ECCS relay

110

110

Injector 2 drive output

111

102

Fuel pressure regulator

112

112

Injector 4 drive output

115

 

Heater output for 02 sensor (not on exa)

116

116

Injector ground

 

 

This table shows which wires from the EXA plugs to connect to which wires on the CA18DET ecu plug. So basically all you have to do is work through the four EXA plugs, individually following the steps below. You will find that the wires from each EXA plug actually tend to group together on the DET plug, which makes it much easier. Credit to datnet.org, and hairball from the nissanexa.com forums for sources for this table.

 

 

Repeat these steps for all of the 60 odd wires! You will find that you have quite a few wires left over on the DET ecu plug, thatís ok they are for functions which we donít need. There will also be a couple left over from the EXA loom, same deal.

 

When you have done all of them, plug into the CA18DET ECU and test run! If you have any problems, check your wires against the diagrams.

 

Ok youíre finished! I will update this if I discover any extra things that need to be done while Iím finishing off my conversion. Good luck!