My car is reading the map sensor

Asked by May 19, 2015 at 05:55 AM about the 1993 Chevrolet Caprice Base

Question type: Maintenance & Repair

I replaced the part an all the
vacuum lines and it still
showing the same code

9 Answers


OBD1 system, you have to clear the ECM after repairs are made.

1 of 1 people found this helpful.

I disconnected the battery for 12 hours won't that reset everything?

And the car is still running the same also


Yes that normally does it, so now you have to start checking the wiring, sensor grounds are a problem with these cars so start there.

1 of 1 people found this helpful.

Ok so if it is the ground do I just run one straight from the battery for what should I do?


Dig out your wiring diagram and trace out the ground wire to the point where it is grounded, usually a bolt on the intake somewhere, disconnect the ground and ohm it out to make sure the resistance is normal and not open then make sur the connections are clean when putting it back together. After you checked and repaired if necessary the grounds and you still get the code, then you need to check for computer power to the sensor, that will be about 5 volts, then check the signal return wire from the sensor to the ECM, for open circuit, if all of that checks good then you have a bad new part, it happens.

1 of 1 people found this helpful.

Thanks alot


google your make, model, year, and How to test the map sensor. There is a site that has 3 to 4 pages of info, testing, explanation and what to do after when the light is still there.

Best Answer

Thanks for your vote, rereading, i must mention that no jumper wires or circuits need be added to a system of this type during testing unless directed to do so by the service manual. that can be a mindblower. Enjoy your car, have a great day.

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