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Mefi1 guys please HELP! 502 efi GenV problems with Mefi1

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Old 07-22-2022, 09:45 AM
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Originally Posted by AllDodge
Without 5V there, then the EST is not transferring timing to the ECM

When you say you have 5V on the others, is it exactly 5V or close to?
okay yes I will check that right now. yes the ecm doesnt transfer it to rcm mode because the ohms on the j2-23 is not what the ecm needs. in distributor mode I should have over 3000 ohms at j2-23 but i have 1000. if i disconnect the ecu and give 5v to j2-24 , i have 5000 ohms on j2-23. just the opposite way what it should be like.
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Old 07-22-2022, 10:12 AM
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okay i hookes it up to a battery, didnt change something. on tps and map i have 4.99V from the ecu coming.
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Old 07-22-2022, 10:15 AM
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on j2-23 i have 5000 ohms and 1000 ohms when i trigger j2-24, but only with ignition off. referring to the manual i should test that with ignition ON, but then I have 1000 ohms on j2-23 and 5000 when i trigger j2-24. so with ignition on it doesnt do what it should do.
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Old 07-22-2022, 10:19 AM
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how do you have the ignition switch wired into the cannon plug ?

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Old 07-22-2022, 10:32 AM
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Originally Posted by F-2 Speedy
how do you have the ignition switch wired into the cannon plug ?

the right hand cable is connected to the battery negative, together with the big ground cable off the engine block. the lefthand cable is connected to the battery + together with the big cable from starter motor.
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Old 07-22-2022, 10:41 AM
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4.99 is good enough
Circuit 423 should key ON = no more then 0.5V motor running = 1.2V
Circuit 424 should key ON = no more then 0.5V motor running = 4.5V

Did you get the module from GM or Merc?
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Old 07-22-2022, 10:46 AM
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Originally Posted by AllDodge
4.99 is good enough
Circuit 423 should key ON = no more then 0.5V motor running = 1.2V
Circuit 424 should key ON = no more then 0.5V motor running = 4.5V

Did you get the module from GM or Merc?
key on 423 is 0.04v
key on 423 is 0.00v
on j2 connector without ecm hooked upstarting the engine isnt possible right now because i have disassembled the intake manofold to check the harness.

i have 2 modules, thought maybe the 1st was bad. both are merc
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Old 07-22-2022, 11:23 AM
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are you sure that gnd wire in the plug is in the correct pin ?
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Old 07-22-2022, 11:36 AM
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Originally Posted by F-2 Speedy
are you sure that gnd wire in the plug is in the correct pin ?

refereing to this it should be right
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Old 07-31-2022, 02:36 AM
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did try everything. don't know what to do now with this. anyone?
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