If you check across the terminals with a DMM on ohms then you will be able to determine which pins are for the relay coil. Measure across the other terminals, then apply 12v to the relay and see if it switches properly. It is possible to remove the cover from the relay, if you do so then you will see that there is a resistor across the coil, it does need that resistor so you can't replace the relay with a later one or an aftermarket item.
__________________
1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
Your explanation leaves a lot of "untested" area, so. no, it's not conclusive that the ECU is at fault.
There are a couple of perhaps "known" problem areas that need to be investigated for what appears to be a fuel pump failure - there is a relay that powers the pump, the wiring to the pump, and the pump ground is a known corrosion area. There's also an ignition feedback circuit which can cause the ECU to switch the pump off.
I would not apply voltage to the injector - especially since you feel (or know) that you have a pump related issue - if the pump is not coming on there will be no pressure at the injector.
The engine won´t start. My guess is that the ECU is broken, 33920-60A70.
This is how I came to conclusion.
The fuel pump is not supplied with voltage, I tested it seperatley and it works.
I remove the fuel hoses and fuel is coming when supplying voltage to the fuel pump.
I´ve tested the sensors located on the carburetor and it seems like they are working properly.
Removing the air cap and adding fuel the engine starts.
Of course I´ve tested the spark plugs, and they are also working properly.
I´ll be happy if anyone could guide me further in this mather, or if convinced that the ECU should be replaced maybe let me know where I can purchase this spare part.
Thank you for any help towards getting my suzuki started again.
Now I have finished to change the caps but due to some little acid sittng close to R52 (1K) and D22 , also for 100 uF ( I have cleaned) I can't understand the correct soldering point.
Now I have replaced the caps, one of them, 100uF was already changed but not so good with soldering so I can try to understand the correct soldering point and if on + side it is soldered on both faces of the board.
In addition if you think that a different ecu is better I can consider the upgrade.
The 1989/90 ECU is different from the later ECUs because it does not control the ignition. Are you wanting to change to an ECU that controls both fuel or ignition or do you only want to repair/replace the existing ECU?
__________________
1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
This is a fairly unusual ECU, a very early Vitara ECU which is a fuel and emissions systems controller only
The Micro is a Mitsubishi branded 63B01 which is an evolution of the 6801 processor. E816 is the firmware version.
This ECU could be modified with a daughterboard to enable it to be retuned but for a performance engine an upgrade to a later 8V ECU with ignition control would be a more preferable option.
These 1988 -1990 ECU tend to suffer from burnt PCBs caused by capacitor failures, this one has fairly typical damage, the the majority of debris from this has already been cleaned off.
__________________
1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
