will run on test fuel.when engine is DEAD. (2 factors there) reverse of above. (did both ways due to things intermittent we must)
now;
so that is injection failure. #1
if the ecu sees spark dead from the suppressor (spark actually good) the ecu cuts fuel, most times the suppressor never fails but can fall off, seen that.
if the ECU sees.
Pin A1 dead signal all fuel is cut, by ECU this is hard coded logic in the ECU and is normal
rule #2 for this ECU
is pin A21, this is throttle angle, 1vdc is normal 4v to 5v it wrong dead wrong. at A21, if ever stuck high with tps ground broken?, the ECU goes to CUT FUEL MODE
this car and all suzuki EFI all cut fuel when driver pushes throttle pedal to floor cranking, this is the super secret unflood mode, (really all cars EFI)
make sure at key on, pin A23 is 5vdc, (4.75 to 5.25vdc) if not ECU is bad or that wire is shorted, or B1/b7 dead.
key on CEL must Glow or the B1 and B7 pins are dead. The CEL lamp must GLOW keyon only, then go out engine running.
![[Image: 89-90schem1.jpg]](https://fixkick.com/INJECTORS/89/89-90schem1.jpg)
Things are not always simple and black and white, enter shades of gray:
there is the possibility that the spark is weak. good but weak. at brown/white wire above. bad COIL (spark) can be weak too. even partial primary shorts.
this makes the suppressor wire goes weak and the ECU may not see the spark at A1.
this distrib is noted for lots of failures like this, both weak spark and intermittent dead spark. and is 30 years old, there is that.
how does the instrument cluster tachometer work? if dead cranked or running, then brown wire is dead or weak. (for sure not TACHO dead when test fuel works, (a 2 person test)
some of these cars have CRUISE control (and box) that can short the brown wire, and fueling ENDS DEAD. (brown the red/blue)
cranking rpm is only 200 rpm so tacho needle move very very tiny, and can be impossible to see then but for sure test fuel it must match engine RPM during that test, or the brown wire, is dead.
the car with no 4wd has no tachometer, so not sure what you really have there.
now;
so that is injection failure. #1
if the ecu sees spark dead from the suppressor (spark actually good) the ecu cuts fuel, most times the suppressor never fails but can fall off, seen that.
if the ECU sees.
Pin A1 dead signal all fuel is cut, by ECU this is hard coded logic in the ECU and is normal
rule #2 for this ECU
is pin A21, this is throttle angle, 1vdc is normal 4v to 5v it wrong dead wrong. at A21, if ever stuck high with tps ground broken?, the ECU goes to CUT FUEL MODE
this car and all suzuki EFI all cut fuel when driver pushes throttle pedal to floor cranking, this is the super secret unflood mode, (really all cars EFI)
make sure at key on, pin A23 is 5vdc, (4.75 to 5.25vdc) if not ECU is bad or that wire is shorted, or B1/b7 dead.
key on CEL must Glow or the B1 and B7 pins are dead. The CEL lamp must GLOW keyon only, then go out engine running.
Things are not always simple and black and white, enter shades of gray:
there is the possibility that the spark is weak. good but weak. at brown/white wire above. bad COIL (spark) can be weak too. even partial primary shorts.
this makes the suppressor wire goes weak and the ECU may not see the spark at A1.
this distrib is noted for lots of failures like this, both weak spark and intermittent dead spark. and is 30 years old, there is that.
how does the instrument cluster tachometer work? if dead cranked or running, then brown wire is dead or weak. (for sure not TACHO dead when test fuel works, (a 2 person test)
some of these cars have CRUISE control (and box) that can short the brown wire, and fueling ENDS DEAD. (brown the red/blue)
cranking rpm is only 200 rpm so tacho needle move very very tiny, and can be impossible to see then but for sure test fuel it must match engine RPM during that test, or the brown wire, is dead.
the car with no 4wd has no tachometer, so not sure what you really have there.
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