Invent Jetronic installation manual

Installation of injector rail

ECU installation

Preparing distributor

Additional information

Installation of injector rail

Remove mechanical injectors with distributor

Remove upper half of intake manifold.

Remove throttle dampfer (under throttle assembly)

Remove MAF air plate. Secure moving part with plastic strap.

Install distributor cap using sealant

Cut start injector mount which prevents installing fuel rail.

Seal start injector with a sealant.

Seal injector ventilation pipe

Cut mechanical injectors to remove rubber inserts. We will use it for a new injectors.

Cut inserts as on a photo

Install injector inserts

Install new injectors into inserts as deep as you can. Install fuel rail.

Drill holes for screws and fasten fuel rail.

Position fuel pressure regulator. Check that you can install intake manifold.

Drill holes to fasten pressure regulator.

Cut fuel pipe into 2 pieces and install fuel lines.

Install idle valve

Place wire harness and connect it to injectors.

Cut vacuum hose into 2 pieces and install vacuum pipes:

1. From fuel pressure regulator to intake manifold

2. From vacuum pipe in wire harness to intake manifold

It’s preferred to connect vacuum just after throttle plate.

Install intake air temp sensor (IAT) into intake rubber hose.

Use this connector to connect IAT sensor

ECU installation

ECU is dust and splashproof. It cannot withstand continuous water contact or high pressure cleaning.

Do not install ECU with cable upwards. In this case, water and moisture will floow off the cable onto ECU.

Remove old ECU.

Connect injectors’ 12V power line in parallel to existing wire.

Cut existing wires to connect injector 1..5.

2.3L engine (35-pin connector)

2.0L engine (25-pin connector)

Injectors power line (12V) - 14

Injector 1 - 12

Injector 2 - 9

Injector 3 - 2

Injector 4 - 22

Injector 5 - 20

K-line - 11

Ground - 18 и 35

EXT signal - 33

If some of required wire isn’t availabe, you can pull any of following wires: 19,24,25,29

Injectors power line (12V) - 1

Injector 1 - 24

Injector 2 - 22

Injector 3 - 20

Injector 4 - 19

Injector 5 - 7

K-line - 16

Ground - 15 и 17

EXT signal - 15

In some stock harness EXT signal is wired to air conditioner relay.

If you don’t have OBD2 connector in car, you can simply connect 3 wires to the OBD adapter (Ground, 12V, KLine)

4 - ground

7 - К-line

16 - 12V

 

Connect vacuum hose to ECU. Make sure that vacuum hose is U-shaped. It’s required to avoid pressure sensor damage from condensated water.

Preparing distributor

FAQ

Q: Is it mandatory?

A: No, you can still use full-group injection

Q: My distributor is different. What should I do?

A: Manual is written in such way that you should get proper result on any distibutor

Manual

Find spark plug wire of first cylinder

Mark this wire on distributor housing

Remove distributor cap

Turn crankshaft until rotor meet our mark

Remove rotor and protective cap

Mark shutter gap which is next to the hall sensor

Cut a vane by 2.5mm exactly

Warning! If you will cut more than 2.5mm, ignition control unit will malfunction. If you will cut less - ECU will not be able to sync properly.

Additional information

Invent-Jetronic 2.3L pinout

2 - Inj.3

3 - CLT

4 - IAT+

5 - IAT-

7 - Lambda

8 - GND

9 - Inj.2

11 - K-Line

12 - Inj.1

13 - Check Engine

14 - 12V power

17 - Idle

18 - GND

20 - Inj.5

21 - MAF emulator output

22 - Inj.4

23 - TPS

26 - TPS 5V power

28 - Idle switch

30 - Hall sensor

31 - Full load switch

33 - EXT input (AC input if available)

35 - GND

Invent-Jetronic 2.0L pinout

1 - 12V power

2 - GND

3 - Idle ch.1

4 - Idle ch.2

5 - Full load switch

7 - Inj.5

8 - Lambda

10 - IAT+

12 - IAT-

13 - Idle switch

14 - TPS 5V power

15 - EXT input (AC input if available)

16 - К-Line

17 - GND

18 - TPS

19 - Inj.4

20 - Inj.3

21 - CLT

22 - Inj.2

24 - Inj.1

25 - Hall sensor

Stock 2.3 schematic

100- Injection ECU

103- Ignition ECU

16 - Start inj

6 – Idle valve

2 – EVAP valve

84 – Dashboard

80 – AC

36 – Throttle switches

37 – Lambda

21 – Fuel pressure regulator

42 – CLT

50 – MAF

51 – Atmospheric pressure sensor

40 – Hall sensor

45 – Knock sensor

91 – Fuel pump relay

3 – Fuel pump

10 – Ignition coil switch

11 – Ignition coil

Stock 2.0 schematic