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Faulty Engine Ground on a 1990 Galant
A faulty engine to chassis ground may cause an intermittent Code 11 (oxygen sensor) on 1990 Mitsubishi Galant 2.0 liter sohc models. Use the following procedure to diagnose the engine ground:
- Check the oxygen sensor output with a DMM at the oxygen sensor.
- Now check the oxygen sensor output data with a scan tool.
- If the readings are not close to each other, check for a voltage drop at the ground between the engine and the body.
- Turn on the lights and A/C. This will cause more current to pass across this ground and the difference between the two oxygen sensor readings (actual oxygen sensor output and scan tool reading) will probably increase.
- Feel the ground wire with your hand. If the voltage drop is great enough, the wire may be warm to the touch.
- Repair the ground, then recheck the oxygen sensor readings. If the scan tool and DMM readings are now nearly the same, you have fixed the problem.
Bill Lear
Lear Auto Service
Manchaca, Texas
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