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Engine turns over but wont start, no spark to plugs
#7
(10-30-2014, 12:34 PM)robbybobby Wrote: Ok, so all the wires match up to the diagram for the green ECU plug. Here are the readings (all with key on):
the below are GM numbers
GM did not swap numbers (thank gosh ) but did the letters.


A1 - 0.28 12vdc power is dead, main is dead.
A2 - 0
A3 - 0
A4 - 0
A5 - 0
A6 - 0.28
A7 - 0.28 12vdc power, main is dead.
A8 - 0
A9 - 12
A10 - 0
A11 - 0
A12 - not used
A13 - 0
A14 - 0.28
A15 - 11.88 (this wire must be 0.7vdc, or the diode is blown to hell on main PCB inside the ECU.)
A16 - 11.88
A17 - 0

G 105, 106, and 107 are all connected correctly and ground tight.

In case it helps, the wires that got burned in the fire were:
Black ground wire going to thermostat housing (that is the main ground to the ECU, bad news)
Yellow with black stripe (O2 sensor)
Two blue with black stripe wires (to VSV plugs)
One green with white (red colored VSV plug)
One green with yellow (blue colored VSV plug)
are you saying all those burned up? every one? im sure some were collateral damage. the can not in them selves get hot.
only the black can burn or the blue-black.


i need only 2 readings, KEYON.
Suzuki or GM(geO)
Green White(now yellowed)
B1 A1 must be 12v reads 0
A10&2 B10/2 MUST BE 0V ??????? THIS IS GROUND, IT MUST READ 0 VOLTS.

MY Drawing above is Suzuki real
if pin B1 is 12v (it is)
and A10 is 0v, the diode is blown
if A10 read 12v that means you blue up the ECU main ground.

just 2 readings and bam , cause.

did you hot wire the Fuel pump relay? this will blow up any ECU, in a flash, just be off 1 tiny pin and boom , bad $400 ECU.
seen this so many times. its funny,

let me explain how the main relay works, (USA)
the ECU has no power until the main relay energizes.
that means the ecu can not do it's own digital activation of the main relay, (chicken and egg rules)
but the ECU does do that with one simple part. a diode. (its always there and always works unless....)
the ECU grounds the coil of the main relay , just like my schematic shows.
so any time the relay is dead
and in your case the coil is dead. too, 12vdc on coil, (low side)
then the diode is blown to hell (it can be seen blown to hell) or the ECU has no grounds. at Suzuki B2 and B10. (ground)
http://www.fixkick.com
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RE: Engine turns over but wont start, no spark to plugs - by fixkick - 10-30-2014, 09:15 PM

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