the last drawing gif , huge, showing all wires, in car on one page, wow, what a monster that it.
the ECU has many inputs
it shows MAF, "air flow meter " of some kind, many 1991 have a switch there that must be open or closed cranking or the ECU refuses to spark or fuel or both.
and that idle switch, it too , is monitored.
shows no crank sensor, no CKP
only distrib. CMP, Just like all our 91s have,
and many devices on the Ignition spark coil. many.
the "obd1" like device is called the monitor coupler , we had them on GM cars in 1980 way before suz, dreamed of them.
lacking a scope or scan tool, is very limiting, but in any case, one would have check the CMP, and all ECU pins, and the many parts seen on the distributor and spark coil.
what if you put in a whole new harness and it fails to make spark.???? would not that be a horror?
what we do is measure every pin in the ecu, using a meter and on the dynamic pins a scope.
in the old days, we used a thing called a breakout box. to make this easier.
keep in mind nobody (cept some long retired Japaneese eng. in Japan (mitsubishi") knows what this firmware does. only he knows.
You can be sure the FSM only skims over this... as is par.
The fact is we dont know what pins dead will kill spark (sure cmp) but what others, its a Turbo and they have more rules on Turbos,
the rules prevent, warranty claims, etc.
oil switch? , comes to mind, MAF switch, idle switch,park switch, failure., I have no idea, but validating all ECU pins wins this battle.
we dont know , so we check them all, they have a page for that, . see ours, here, on last link below, see how that works.
Some older ECU dont report all dead inputs... this too, can send tech on wild goose chase,,, what if cmp is dead. as one example.
and ECU mute on that....
as seen here. see the monitor couple , one pin is SD, i bet. serial data. the fsm you have will cover this.
![[Image: 3_14_07_16_8_11_52.jpeg]](http://www.fixkick.com/bbs2/Suzuki-bbs/gallery/3_14_07_16_8_11_52.jpeg)
last resort, see this?
http://www.fixkick.com/ECU/ECU-8v.html
see page 1 2,3,4 there, that is ecu pins tests. out of fsm
but on some cars the CMP is a non hall sensor and must use a scope. (its faraday coil and if the shields are bad the signals dont make it to mama, ECU)
the non hall, is very tiny signals and coax, line around 2 wires, as yours shows.
Not saying i know what sensors your car has, ive not looked at all sensor in your book, yet.
yes, in Canada, they sold gray market cars back then, up there, they imported them. even JDM cars, lacking many smog parts,
but most have the SD pin.
the ECU has many inputs
it shows MAF, "air flow meter " of some kind, many 1991 have a switch there that must be open or closed cranking or the ECU refuses to spark or fuel or both.
and that idle switch, it too , is monitored.
shows no crank sensor, no CKP
only distrib. CMP, Just like all our 91s have,
and many devices on the Ignition spark coil. many.
the "obd1" like device is called the monitor coupler , we had them on GM cars in 1980 way before suz, dreamed of them.
lacking a scope or scan tool, is very limiting, but in any case, one would have check the CMP, and all ECU pins, and the many parts seen on the distributor and spark coil.
what if you put in a whole new harness and it fails to make spark.???? would not that be a horror?
what we do is measure every pin in the ecu, using a meter and on the dynamic pins a scope.
in the old days, we used a thing called a breakout box. to make this easier.
keep in mind nobody (cept some long retired Japaneese eng. in Japan (mitsubishi") knows what this firmware does. only he knows.
You can be sure the FSM only skims over this... as is par.
The fact is we dont know what pins dead will kill spark (sure cmp) but what others, its a Turbo and they have more rules on Turbos,
the rules prevent, warranty claims, etc.
oil switch? , comes to mind, MAF switch, idle switch,park switch, failure., I have no idea, but validating all ECU pins wins this battle.
we dont know , so we check them all, they have a page for that, . see ours, here, on last link below, see how that works.
Some older ECU dont report all dead inputs... this too, can send tech on wild goose chase,,, what if cmp is dead. as one example.
and ECU mute on that....
as seen here. see the monitor couple , one pin is SD, i bet. serial data. the fsm you have will cover this.
last resort, see this?
http://www.fixkick.com/ECU/ECU-8v.html
see page 1 2,3,4 there, that is ecu pins tests. out of fsm
but on some cars the CMP is a non hall sensor and must use a scope. (its faraday coil and if the shields are bad the signals dont make it to mama, ECU)
the non hall, is very tiny signals and coax, line around 2 wires, as yours shows.
Not saying i know what sensors your car has, ive not looked at all sensor in your book, yet.
yes, in Canada, they sold gray market cars back then, up there, they imported them. even JDM cars, lacking many smog parts,
but most have the SD pin.
http://www.fixkick.com