Battery light and check engine light never shut off!

C

cowboyfanatic

New Member
Apr 30, 2007
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Oklahoma
I have an 87 NA supra that I bought as a project car. I rebuilt the engine and hooked everthing back up. When I hooked up the battery, the check engine light and the battery light came on. even with the key out of the car they stay on. I also am not getting spark. I checked the ignition switch, it seems fine. are these problem related and where do I start.
Also, I checked the distributor, it is fine. When I checked the coil/ignitor, it has 12 volts even when the key is off, that is why I thought the ignition switch was bad, but it wasn't.
Please help don't know what else to do!
 
C

cowboyfanatic

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Apr 30, 2007
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Oklahoma
MKIII N00b said:
Check your EFI fuse...and if its starts right up and the light is still on you need to pull the dome fuse for 10seconds and then put it back on. the dome fuse is located in the driver side kick panel.
Click to expand...
I checked that, nothing changed. While I was checking that, I touched the main fuse, ( the big round one) it was hot to the touch is this normal?
 
tlo86

tlo86

Ninja Editor 'Since 05'
Jul 24, 2005
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maybe you put the battery in backwords:)

but it would just blow the main fuse... ask me how i know.
 
C

cowboyfanatic

New Member
Apr 30, 2007
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Oklahoma
Battery was installed correctly. Could my ecu be fried?
I don't understand how there can still be power to something after the car is off and the key is out. crazy!
 
RazoE

RazoE

Boobs/Boost, my favorite
Jun 13, 2006
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MKIII N00b said:
Check your EFI fuse...and if its starts right up and the light is still on you need to pull the dome fuse for 10seconds and then put it back on. the dome fuse is located in the driver side kick panel.
Click to expand...


dome?

i think mine was in the fuse box in the engine bay...
 
M

mpo

New Member
Jul 14, 2007
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Seattle
Have you ruled out a problem with the alternator? Unfortunately my schematics are from the 86.5 and they changed the wiring some in 87 I think. For example I have no CEL. I know on the 86.5 a bad alternator would light 3 different lights for some reason that I never understood.

mpo
 
johnathan1

johnathan1

Supra =
Aug 19, 2005
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mpo said:
Have you ruled out a problem with the alternator? Unfortunately my schematics are from the 86.5 and they changed the wiring some in 87 I think. For example I have no CEL. I know on the 86.5 a bad alternator would light 3 different lights for some reason that I never understood.

mpo
Click to expand...

86.5 Supras had no check engine light? What in the world??

So the starter turns the motor, but it won't start running?

When my alternator went bad, three lights (CEL, battery, and one other one I can't remember...) would come on intermittently, then after a while, they stayed on and the car wouldn't run anymore after the battery was completely depleted...
 
M

mpo

New Member
Jul 14, 2007
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Seattle
johnathan1 said:
86.5 Supras had no check engine light? What in the world??

So the starter turns the motor, but it won't start running?

When my alternator went bad, three lights (CEL, battery, and one other one I can't remember...) would come on intermittently, then after a while, they stayed on and the car wouldn't run anymore after the battery was completely depleted...
Click to expand...
Well I have never seen it in 13 years and it is not on the schematic. I know the radio harness is completely different than the 87. I learned that the hard way.

When my alt failed it was just as you say, the alt and brake light went on. According to my schematic the "rear lights" bulb should also go on but I really don't know what that is!
 
C

cowboyfanatic

New Member
Apr 30, 2007
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Oklahoma
so, if my alternator was bad, i still wouldn't get spark? I have replaced my distributor, coil and ignitor, still no spark, the car turns over, just no spark, and the stupid lights are still on. how do you check an alternator if the car won't run?
 
cuel

cuel

Supramania Contributor
Jan 8, 2007
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Baytown, Texas
cowboyfanatic said:
I checked that, nothing changed. While I was checking that, I touched the main fuse, ( the big round one) it was hot to the touch is this normal?
Click to expand...

The round thing in the fuse box is actually a relay. It's labeled "MAIN" in the 86.5, but "EFI" in the tsrm. That relay controls both the fuel injection and the ecu, correct? It could be shorted out, as you said its always hot. It's labeled "B" in the link:
http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=BE&P=14

Here's how to check that relay:

http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=109
 
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