Lextreme II
Just call me "Lex"
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This is a very interesting article. Recently my buddy called me sometime in the evening hours and asking me to order him a starter. I told him, WAIT! How do you know its the starter that is going bad? He couldn't answer me. I was not trying to put him on the spot, but I didn't want him to waste 6 hours with $300 plus and find out its not the starter problem. I tried to coach him via phone, but I don't think my message was clear enough. Early next morning I stopped by his home and try to diagnose his problem. Here are some possible diagnoses why your engine is not turning.
Battery and Associated Cables:
It is possible the battery is weak and cause the engine not to turn. However, if you turn on all the lights and blast all the fans and still having trouble turning the engine, then its most likely its not the battery. Second thing you can do is to jump the battery and try again. If jumping the battery doesn't help, its most likely not battery or cable problem. If the battery is weak, the starter will still but very weak or slow. If the battery is really bad, you might hear the click, click, click, click, click sound.
Anti-Deterrent ECU:
This is also possibility especially someone else drive your car. This is very common if you lend your car to someone. The symptom of this condition is "No noise or sound at all" when ignition key is turned. If this is faulty, the symptom will be the complete ignition kill. Therefore, you will not heard and clicking sound or engine turning at all. If this is the problem, you can easily reset the Anti-Deterrent by using your key. Stand out side of the car and close all doors. Insert the key into the driver side door and turn the key to clockwise and counterclockwise for three four cycles. Basically, you are lock, unlock for 4 times and this procedure will reset the anti-deterrent ECU. If this happen to you, its quite scary at first, but the solution is very simple.
Faulty Starter Relay:
The easiest way to find out if the starter relay is bad is to open up the engine bay fuse box. You can use a flat screwdriver and take out the cover. Have a friend try to start the car for you. If you hear a click sound right at the starter relay (Green Color Square Type Relay). If it click when your friend try to start the car, then the relay is good. Second thing you can do is to borrow a starter relay from a friend. If the working relay installed and the engine still not turning, then its not faulty relay.
Neutral Start:
Believe it or not, the transmission shifter play a role in starting your car too. As your car aged, the transmission shifter linkage doesn't give good contact to the starting system and your engine will not turn or click at all. Here some signs of this problem.
1. No P (park) or N (Neutral) indicator light while key on. Even with P & N indicator lights come on but that still doesn't it has good contact.
2. When you turn on the key, you should not hear anything at all. Its a complete silent. No turning or clicking at all.
To test this out, the best way is to your left hand and push forward on the shifter until you see P while trying to start the car. Or you can turn the key into on position and hold it there while pushing on the transmission shifter. Remember this is a very common problem with older cars.
Bypass Starter Circuit:
There are many reasons why the engine won't turn. It is possible the circuitry might be faulty. However, you can test your starter without taking it out. You can bypass the circuitry and use a positive (+) into the fuse box. Here are the procedures:
1. Open up the fuse box with a flat screwdriver. The fuse box is located near the battery.
2. Use a 10 mm socket and loose the fuse/relay module.
3. From there you need to use the same 10 mm socket and loose the plug.
3. Once the plug is out, look for a large black wire right under the Green Relay (Starter Relay) See starter diagram below.
4. Supply the black wire with a power source. Please be careful do not touch this hot wire to anywhere else.
More detail here http://www.lextreme.com/dx-starter.html
I think the most important thing I would like to stress is the Neutral Start. Very very common with older SC400 and LS400.
Battery and Associated Cables:
It is possible the battery is weak and cause the engine not to turn. However, if you turn on all the lights and blast all the fans and still having trouble turning the engine, then its most likely its not the battery. Second thing you can do is to jump the battery and try again. If jumping the battery doesn't help, its most likely not battery or cable problem. If the battery is weak, the starter will still but very weak or slow. If the battery is really bad, you might hear the click, click, click, click, click sound.
Anti-Deterrent ECU:
This is also possibility especially someone else drive your car. This is very common if you lend your car to someone. The symptom of this condition is "No noise or sound at all" when ignition key is turned. If this is faulty, the symptom will be the complete ignition kill. Therefore, you will not heard and clicking sound or engine turning at all. If this is the problem, you can easily reset the Anti-Deterrent by using your key. Stand out side of the car and close all doors. Insert the key into the driver side door and turn the key to clockwise and counterclockwise for three four cycles. Basically, you are lock, unlock for 4 times and this procedure will reset the anti-deterrent ECU. If this happen to you, its quite scary at first, but the solution is very simple.
Faulty Starter Relay:
The easiest way to find out if the starter relay is bad is to open up the engine bay fuse box. You can use a flat screwdriver and take out the cover. Have a friend try to start the car for you. If you hear a click sound right at the starter relay (Green Color Square Type Relay). If it click when your friend try to start the car, then the relay is good. Second thing you can do is to borrow a starter relay from a friend. If the working relay installed and the engine still not turning, then its not faulty relay.
Neutral Start:
Believe it or not, the transmission shifter play a role in starting your car too. As your car aged, the transmission shifter linkage doesn't give good contact to the starting system and your engine will not turn or click at all. Here some signs of this problem.
1. No P (park) or N (Neutral) indicator light while key on. Even with P & N indicator lights come on but that still doesn't it has good contact.
2. When you turn on the key, you should not hear anything at all. Its a complete silent. No turning or clicking at all.
To test this out, the best way is to your left hand and push forward on the shifter until you see P while trying to start the car. Or you can turn the key into on position and hold it there while pushing on the transmission shifter. Remember this is a very common problem with older cars.
Bypass Starter Circuit:
There are many reasons why the engine won't turn. It is possible the circuitry might be faulty. However, you can test your starter without taking it out. You can bypass the circuitry and use a positive (+) into the fuse box. Here are the procedures:
1. Open up the fuse box with a flat screwdriver. The fuse box is located near the battery.
2. Use a 10 mm socket and loose the fuse/relay module.
3. From there you need to use the same 10 mm socket and loose the plug.
3. Once the plug is out, look for a large black wire right under the Green Relay (Starter Relay) See starter diagram below.
4. Supply the black wire with a power source. Please be careful do not touch this hot wire to anywhere else.
More detail here http://www.lextreme.com/dx-starter.html
I think the most important thing I would like to stress is the Neutral Start. Very very common with older SC400 and LS400.
