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Wrenchtech
Wrenchtech, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1403
Experience:  40 years experience with ASE certification as Master Technician with L1--Repair Shop Owner
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1990 Chevy Lumina: voltage..throttle body injector..check engine light

Customer Question

1990 Chevy Lumina Van 3,1 TBI won''t start no voltage at the throttle body injector also can''t get the check engine light to come on. Tried a code reader it says can''t communicate with the ECM.
Submitted: 8 years ago.
Category: Chevy
Expert:  GriffinAuto replied 8 years ago.

Check all the fuses, but look at cigarette fuse first. It powers ECM.

 

Expert:  Wrenchtech replied 8 years ago.
The cigarette lighter fuse only powers the connector and not the ECM.

In the inside fuse box there will be a 10A fuse marked "ECM" This fuse powers both the injecters and the ECM.

See image.

graphic
Customer: replied 8 years ago.
all fuses checked out the first thing I did.The van was running fine I shut it off for approx. 20 min. wouldn't start back up.
Expert:  Wrenchtech replied 8 years ago.
The injectors are powered directly from that fuse and you said you didn't have there so either the fuse is bad or the wiring in between has a problem.
Wrenchtech, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1403
Experience: 40 years experience with ASE certification as Master Technician with L1--Repair Shop Owner
Wrenchtech and 9 other Chevy Specialists are ready to help you
Customer: replied 8 years ago.
Thanks for help I'll check the fuse again and the wiring.
Expert:  Wrenchtech replied 8 years ago.
Use a test light so you can be sure the fuse itself is receiving power.

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