Question about 1993 Lexus Es 300
Autozone sold my son the wrong battery. He put it in the only way it would fit and attached the cables. He got a spark but it would not start. We took it back to the store and they replaced the battery with the correct one. Installed it and still nothing. A mechanic has been trying to figure out what is wrong. Now after 4 days and extensive tests he says the computer needs to be replaced. Is this an easy fix or should we have the mechanic do it? Should we only use new parts or is it okay to replace with a used computer? Or should we just scrap the car and put our money towards something else?
Make sure an OBD reader is used to make a connection to the car's ECU/ECM. If no connection can be made, then you can remove the ECU and test it for current and resistance. If either of those tests fail, your car needs a new computer.
Posted on Feb 10, 2014
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Posted on Jan 02, 2017
it is absolutely the starter solenoid im not sure if you can replace just the solenoid but you definitely need a new starter / solenoid.
Posted on Jun 24, 2009
Hi, causes of excessive current drain from a car battery include things like lights that remain on (trunk and hood lights, interior lights, brake lights, etc.) and also relays that may be stuck on, or modules that are not going to sleep or powering down. A fuel pump relay that sticks on may keep the fuel pump running after the engine is shut off. A switch or relay that powers a rear window defogger can stick on, pulling current from the battery after the ignition is off. An electronic suspension module, ABS module or keyless entry module may remain active long after it should have powered down.An accessory such as a DVD player, game console or cell phone charger left plugged into a rear seat power receptacle may be pulling power from the battery. So before you spend a lot of time trying to figure out where the amps are disappearing, check all of the vehicle's power receptacles to see if something is plugged in that may be using power.
FINDING THE CAUSE OF THE CURRENT DRAIN
If the key-off current reading is above specifications (typically, more than 50 mA one hour after the vehicle has been shut off), the current drain is too high. It's time to start pulling fuses and relays to find the fault. Refer to your vehicle owner's manual or a wiring diagram to identify the fuses and relays. Then pull the fuses and relays one at a time until the current reading drops. Avoid pulling the fuses for the PCM or other KAM-sensitive modules until you have checked all of the other circuits.
Once you've found the circuit that is causing the excessive current drain, check the relay, switch, module or other components in the circuit and replace as needed.
Sometimes a bad alternator diode can cause a car battery to run down. A good diode should only pass current in one direction. If it leaks current in the opposite direction, it may keep the charging circuit on when the engine is not running, causing the battery to run down.
Posted on Oct 06, 2010
Have your alternator tested very soon. You charge it up, it runs good, then over time, it loses power. To me, that sounds like all your electrical loads are being carried by the battery alone, with no help from the alternator.
Posted on Dec 01, 2010
you might of blown your main big fuse and maybe a couple of fuseable leaks it will blow fuses and relay be fore irt would hurt your engine
Posted on Jan 26, 2011
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