How to trace a bad wire in wire harness?
1994 Lexus GS300 with 225,000
Check engine code bad wire harness replace. ECU has been replaced twice. First one lasted three weeks and then started shutting down. Flagship One took a month to honor their warranty and send another out. But it shut down after two days. After letting the car set for a couple of day it will start but as I said the check engine code said replace wire harness. I have gone in internet and been told that there is a bad wire in the harness find that. I do recall the mechanic that replace the motor had to run an wire from the harness to left side of front of motor. So I want to know the best way to check each wire. I know it will be a long process. Also prior to replacing the ECU had another check map sensor and othe electrical. I changed fuel pump, fuel filter, EGr value cleaned filter replaced, intake manifold cleaned, spark plugs replaced,
As @moutainmanjoe said you need to get a schematic for the system in which your code is for then it’s just a case of checking power and ground and continuity across those circuits to find the culprit and bypass it. Not the easiest task but it can be done