Intermittent Code 11 - Faulty Engine Ground (MIT0258AP)

INTERMITTENT CODE 11 - FAULTY ENGINE GROUND

TECHNICAL INFORMATION TIP

INTERMITTENT CODE 11 - FAULTY ENGINE GROUND

YEAR(S): 1990

MANUFACTURER: Mitsubishi

MODEL(S): Galant

DATE OF ISSUE: September 1997

ISSUE & TIP

A faulty engine to chassis All may cause an intermittent Code 11 (oxygen sensor) on 1990 Mitsubishi Galant 2.0 liter SOHO 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 the 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 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 reading are now nearly the same, you have fixed the problem.

Courtesy of Import Service Magazine

with thanks to:

Bill Lear

Lear Auto Service

Manchaca, Texas

REFERENCE NUMBER

MIT0258AP