New to this web site, hopefully not breaking any rules here for re-posting. I need serious help with my SC400; Can an after market Alternator (NEW) cause a SC400 not to start? I have a post going already with 16 hits and only 1 reply, so I thought I would give additional info. I have checked all grounds and cables. I have replaced Alternator (NEW after-market, about 9 weeks ago), battery and starter. I have checked the anti theft system. I have reset the computer. I have learned alot from looking at previous post but still can't seem to get this problem solved. I now have carpitunnel (spelling?) in my right hand. My SC has been in the shop on the rack for 5 weeks now and my tech is pulling his hair out. The battery has a full charge and just turns over. Something in the ignition system is causing this SC not to fire. All of your collective help is needed on this problem so I don't have to 2nd mortgage my house to pay for this. Thank you in advance.
Need major help
- Thread starter keisler
- Start date
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hi,, the ignition sysytem in the sc is like many other toyota cars.. in other words,, it is not any more complicated/expensive then any other except for the fact that its a v8.. the sc400 has 2 distributors, 2 coils and 2 ignitors.. these relly on 1 crank sensor, and 2 cam sensors.. i think,but may be wrong, the ignition may only need the cranks sensor, and the cam sensors are used for the injection.. the ecu decides when to fire, and sends a signal to each of the ignitors,, the ignitors then control the voltge/signal to the coils which then send a spark to the distributors..
so,, first thing i would do is see if the coils are "sparking",, re3move the coil wire going to the distr, and place it near a ground.. check for spark.. if you dont get a spark,, -especially from either coil,,check the ignitors and the crank sensor..
if you do get a spark,, check rotors-distributors..
i dont remember off hand,, but i will get the info on how to check the ignitors and cranks sensor..until then,, start going over basics,, and lets hear what you come up with..
so,, first thing i would do is see if the coils are "sparking",, re3move the coil wire going to the distr, and place it near a ground.. check for spark.. if you dont get a spark,, -especially from either coil,,check the ignitors and the crank sensor..
if you do get a spark,, check rotors-distributors..
i dont remember off hand,, but i will get the info on how to check the ignitors and cranks sensor..until then,, start going over basics,, and lets hear what you come up with..
hi kiesler, the alternator--even if it was not working,, should not affect the ign sysytem..BUT,, if some wires were shorted while removing the alternator you may have a problem.. check to make sure power is going thru the entire power circuit/ system..that you havnt shorted out a major fuse somewhere while removing the alt..
usually--these things turn out to be something simple, but overlooked..
usually--these things turn out to be something simple, but overlooked..
I had a phone call from a member stuck on the side of the road with the same problem.
After a bit of discussion we decided to check power going into the ECU.
Turned out it had blown a fuse supplying power from the ignition switch to the ECU. He replaced the fuse and drove it home.
I would go back to basics and check the ECU has power where it should. You will need to check the wiring diagrams as it should have a few 12v feeds to the ECU.
After a bit of discussion we decided to check power going into the ECU.
Turned out it had blown a fuse supplying power from the ignition switch to the ECU. He replaced the fuse and drove it home.
I would go back to basics and check the ECU has power where it should. You will need to check the wiring diagrams as it should have a few 12v feeds to the ECU.