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Sc300 wiring

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Old Dec 14, 2015 | 10:23 AM
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Default Sc300 wiring

I'm trying to trouble shoot an issue I'm having with me Sc300. I wanted to know if someone could list the locations for all of the ground wires so I could check them for corrosion. I have a feeling that this maybe why me Sc will not hold idle rpm's. I have to gas it while cranking it to stay alive.
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Old Dec 14, 2015 | 11:05 AM
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Originally Posted by bmatic01
I'm trying to trouble shoot an issue I'm having with me Sc300. I wanted to know if someone could list the locations for all of the ground wires so I could check them for corrosion. I have a feeling that this maybe why me Sc will not hold idle rpm's. I have to gas it while cranking it to stay alive.
I assume you are looking only for the engine harness ground wires for the SC300 ? Reason I ask is because there are tons of ground wires on that SC300 . You will need the TSRM to find each one.

For the engine harness ground wires , there are two .. under your intake runner front and rear portion. They are fastened by a 10mm bolt .

And with your problem description , I don't see them being your problem. Why ? That car won't even start if one of those ground wire on the engine harness is loose.

I have a pretty good idea what the problem is based on your description which is the IACV but an error code will confirm it ?

Last edited by gerrb; Dec 14, 2015 at 11:28 AM.
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Old Dec 14, 2015 | 12:23 PM
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Originally Posted by gerrb
I assume you are looking only for the engine harness ground wires for the SC300 ? Reason I ask is because there are tons of ground wires on that SC300 . You will need the TSRM to find each one.

For the engine harness ground wires , there are two .. under your intake runner front and rear portion. They are fastened by a 10mm bolt .

And with your problem description , I don't see them being your problem. Why ? That car won't even start if one of those ground wire on the engine harness is loose.

I have a pretty good idea what the problem is based on your description which is the IACV but an error code will confirm it ?
It's funny you mentioned that because when you did it just reminded me that my mechanic had replaced a valve sometime ago. Does that valve have to do with the power steering as well? I asked because he change a valve that works with the power steering pump because the wheel had became harder to turn over the years.
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Old Dec 14, 2015 | 12:26 PM
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Originally Posted by bmatic01
It's funny you mentioned that because when you did it just reminded me that my mechanic had replaced a valve sometime ago. Does that valve have to do with the power steering as well? I asked because he change a valve that works with the power steering pump because the wheel had became harder to turn over the years.
Oh btw, the engine isn't throwing any codes until the car dies then when I crank it back up it goes away. Idk from its resetting or what but I honestly believe it may be this notorious ECU/ECM node issue I've been reading about.
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Old Dec 14, 2015 | 12:27 PM
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no sir ... totally un-related .
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Old Dec 15, 2015 | 02:22 AM
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Originally Posted by bmatic01
Oh btw, the engine isn't throwing any codes until the car dies then when I crank it back up it goes away. Idk from its resetting or what but I honestly believe it may be this notorious ECU/ECM node issue I've been reading about.
You said it gives you codes once it cuts off ... don't restart it and read the codes and let us know what the codes are.
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Old Dec 17, 2015 | 11:49 AM
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Originally Posted by gerrb
You said it gives you codes once it cuts off ... don't restart it and read the codes and let us know what the codes are.
This. It will point directly at your issue.
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Old Dec 19, 2015 | 12:38 PM
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Locations for factory grounds in the engine bay:

2 on the intake manifold next to the driver's side strut tower.
One below these ^ 2, on the block that connects to the drivers side chassis, then to the negative battery terminal.
One right next to the front of the fuse box on the drivers side of the chassis next to the whole plug
One to the left of the intake box.
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