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Old 04-28-2008, 02:01 AM   #1 (permalink)
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Metro - '90 Geo 2 door
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geo metro injector

If I understand correctly, the engine control module (ECM) needs to provide a ground to the injector on my 91, 5 spd, Geo Metro.. Tried the ECM and distributer in another car, and both work. The car will run if the injector is grounded to the frame with a test lite, so the injector is working. It just isn't getting a ground from the ECM. Is the problem in the wireing, or are there other possibilities? How can I identify, at the ECM, which wire grounds the injector? Thanks. Gerry

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Old 04-28-2008, 02:45 AM   #2 (permalink)
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Hello Gerry,
my Suzuki Swift (3cyl, late 80ties, 10GA?) circuit says that ECU pin A2 leads (yellow/black) to injector (0.5 - 1.5 Ohm).
+12V is provided by an injection relais which also powers fuel pump (can you listen 1-2s 'zzzzz' when ignition is on?).
Note that there is a resistor between the injection relais and the injector to limit the current. Maybe this resistor is broken down (1.9 - 2.1 Ohm).

Hope this helps...
»Horst
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Old 04-28-2008, 03:48 AM   #3 (permalink)
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Thanks for the help ami81. My fuel pump works fine and I do have current to the injector. It is the ground side of the injector where I have the problem. The resistor you mention would not apply to the ground side, would it?
Gerry

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