SC400 Neurosurgery - wiring harness repairs
#1
SC400 Neurosurgery - wiring harness repairs
I had started a previous thread because my SC wouldn't start - determined I had a short in the wiring harness - pulled out the main harness from the ECU/engine and found lots of heat singed wiring - I have been working on it now for a few days and ran into a problem - pic #1
Problem: the FI plugs are breaking apart as I remove the pins to solder on new wires - pic #2 - not even the Lexus dealer knows if I can just get new plugs w/inserts - of course, none of the typical parts stores have any listings - anyone know where I might can get some new ones? - I'm headed to a couple of salvage yards tomorrow to see what I can find - there are a few more plugs that need replacing too, so I may be able to find used replacements
Last question - I have found this jumper (pic3) in the common circuit of the right side set of injectors - there isn't one like this on the left side - I thought it might be a connection for a noid light, but i can measure about 7ohms of resistance across the jumper itself (??) - is this device needed for normal operation? - does anyone know?
Any help is appreciated - TIA
PS - what?! no beer smiley??!!
Problem: the FI plugs are breaking apart as I remove the pins to solder on new wires - pic #2 - not even the Lexus dealer knows if I can just get new plugs w/inserts - of course, none of the typical parts stores have any listings - anyone know where I might can get some new ones? - I'm headed to a couple of salvage yards tomorrow to see what I can find - there are a few more plugs that need replacing too, so I may be able to find used replacements
Last question - I have found this jumper (pic3) in the common circuit of the right side set of injectors - there isn't one like this on the left side - I thought it might be a connection for a noid light, but i can measure about 7ohms of resistance across the jumper itself (??) - is this device needed for normal operation? - does anyone know?
Any help is appreciated - TIA
PS - what?! no beer smiley??!!
#2
Well, I found some good FI plugs on a couple of 4 banger Toyotas and have them wired into the harness
Studying the schematic to find out about the jumper - havent found anything yet, but still searching
Studying the schematic to find out about the jumper - havent found anything yet, but still searching
#4
Had to replace the entire connector(s) for the FIs - ive got all the needed wiring repairs complete now -- i went through an entire 35' roll of new 16awg and 5' of 10awg green wire replacing the grounds alone - been splicing/soldering for 2 weeks now -- im starting to feel better about the motor actually starting now -- the wires were in such bad shape from the engine heat
Last edited by zeus87gn; 08-22-12 at 06:05 AM.
#6
1JZ Single SC400
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If you decide to give up, I believe OLT has a full uncut harness. I maybe mistaken, but I have seen a picture of one on here in his attic in a different thread of his.
#7
Nope - wont be giving up at this point - too much time invested - im actually fitting the harness back onto the engine at this point - all the FI plugs are replacements now but all have working lock clips
I figured out the jumper has no relevant use in the harness so i left it out
I figured out the jumper has no relevant use in the harness so i left it out
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#8
Ok, so I got the starter to turn the engine - YAHOO!!
The work I put in on the harness has paid off
Now I have to get it to fire
My sons friend discovered a cut wire - unfortunately it appears to be the lead to the d/s cam sensor
Would that stop both coils from firing?
The work I put in on the harness has paid off
Now I have to get it to fire
My sons friend discovered a cut wire - unfortunately it appears to be the lead to the d/s cam sensor
Would that stop both coils from firing?
#10
My time paid off - IT LIVES!!!
I had bad wires on the cam position sensors
I also had the sensor harness connector (up by the FI plugs) plugged in backwards!
The outside of that 6pin connector was broke off
Another case of heat singed plastic
I had bad wires on the cam position sensors
I also had the sensor harness connector (up by the FI plugs) plugged in backwards!
The outside of that 6pin connector was broke off
Another case of heat singed plastic
#11
Lexus Test Driver
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I'm glad you found the problem. Harness repair is not for the faint of heart. I found this place that can repair harnesses or supply us with pigtails and new connectors. I thought I was going to need my HVAC harness repaired. I hope this helps someone out there with harness problems:
http://www.aeromotive.us/index.html
For repairs or diagnosis:
http://wireharnessrepair.com/Home_Page.html
http://www.aeromotive.us/index.html
For repairs or diagnosis:
http://wireharnessrepair.com/Home_Page.html
Last edited by SC400DAVE; 08-23-12 at 02:40 PM. Reason: ADDED INFO
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