rb25 into s13 not starting, any ideas???

Discuss the RB20, RB25 and RB26 series engines.
DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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So i sold my 91 240 with sr20 a few years ago because i wanted to start a major project. I ended up buying a 93 vert, and had the front clip left over from my sr20 swap, so i decided to do the RHD conversion. After that i installed a series one rb25 last winter, and cant get it to start. When i turn my key i can hear the relay in the engine bay click, but im not getting a signal to the s terminal on the starter. I decided to diagnose this issue later and i bypassed with a starter button. Nothing... im serously sick of this problem, ive been over my wiring what feels like hundreds of times. Any insight would be greatly appreciated! The other thing ive noticed is that that i cant pull my key out of the ignition...weird..


DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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anyone have an idea????

DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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also, does anyone know how to test the CAS anyother way then taking it out and spinning it to hear for a injector pulse??? Im afraid this may be my issue, but ive never run this engine so im not sure if its this or something else. i already know im not getting spark or fuel. Thanks again!

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d356bud
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Car: 1990 240sx w/ RB25DET
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as far as the cas u can test it by checking the voltage of the 1 deg and the 120deg pins of the ecu with a volt meter and it should read some where between 5 volts and 2 volts. But of course the engine needs to be turning over to do this

mott6904
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Joined: Tue Jan 30, 2007 2:50 pm
Car: rb20 big turbo big cams s13, 97 kouki, turbo audi a4,turbo busa

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so you got it to crank with the button but it still wouldnt start? if so then do the basic diagnostic like does it have fuel pressure, injector pulse, spark, compresion and then get back to us

DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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I will definatly check the voltage at the ecu for the cas, thanks for that. Ive been through the diagnostics it has fuel pressure at the fuel rail. I checked for injector pulse with a noid light, and there was no pulse. I also checked for spark, and there was none. Compression is good. My battery is relocated to my trunk, i wonder if it may not be grounded good enough. The relay under the hook is clicking when i turn my key over, but im not getting a signal to the starter, does anyone have a good wire diagram that could tell me where the signal goes after the relay, all the schematics ive found online are too small and broken up to follow. Thanks again!

the owl
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i would check spark and voltage if i were you

mott6904
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There are a couple of plugs where the relays are at on the passenger side. The plugs go to the lower harness for the engine. I think it includes the alternator, oil pressure sensor, starter, and the transmission switches and speed sensor if that isnt hooked up then you would get a signal to starter. I would say check power since you moved the battery to the trunk. How did you install the power wire from the battery.

DropTopRB
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Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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So i checked the imputs at the ecu for the cas, and the 1 degree imputs both read about 5 volts even when the engine is not cranking. Im not getting anything from the 120 degree imputs, weather the engine is cranking or not. I checked all my grounds, everything is good and solid. I have a 2 gauge cable that connects the battery to the positive componets im the engine bay. I still can not get the engine to crank with the key, i need to use a push button, i have no idea why i cant get it to crank. Is there a second nutural switch because its a convertable??? Anyone know where i can buy a factory service manual????

styc
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Joined: Thu Jul 05, 2007 11:17 am

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so did you get it to crank?

if you aren't gtting 12v to the S terminal it won't turn over, so first make sure you are getting 12v when the key is turned to the START position. if you don't, you're going to have to trace the wire coming off your S terminal.

i believe it goes from the ign to the clutch switch then to the brake switch or vice versa.

that will only get it to turn over, you still have to find out why you aren't getting spark or fuel.

craz4240
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Car: 1995 240sx w/rb20det
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Did the car ever run b4 the rb25 swap but with the RHD conversion?

DropTopRB
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Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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I never had the car running with the RHD conversion, i did everything all at once. Im gonna go work on it right now, ive been reviewing wire daigrams, and i think im gonna pull my dash out and check everything. I have been cranking the engine over with a snap on starter button, its an old school tool for adjusting valves without 2 people. I cant get it to crank by turning the key.

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USMCgetsome
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This is simple! Get a multimeter. Dissassemble the column on the steering wheel. Find the plug from the ignition key assembly. With battery powered up probe the connector from the rear. LOL. U will find while moving to the first position 12vdc constant. At the start position 12vdc switched. Follow that wire to the engine bay or splice into it and run a new wire to the starter. Need more help call me. 210 837 1670 mario.

craz4240
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DropTopRB wrote:I never had the car running with the RHD conversion, i did everything all at once. Im gonna go work on it right now, ive been reviewing wire daigrams, and i think im gonna pull my dash out and check everything. I have been cranking the engine over with a snap on starter button, its an old school tool for adjusting valves without 2 people. I cant get it to crank by turning the key.
Yeah wow ummm I would actually do that just cause if that was alot of stuff to move/change all at once...you will figure it out...

DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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because it was an automatic there is an inhibitor switch, now when i turn the key im getting power at the ignition to the 2 terminals im suppost to. One of those wires goes to the fuse box, then out to the eccs. The other goes to the inhibitor switch, then out to the starter, im thinking that i might have a problem with the switch. Does anyone know where this switch is located, and what it looks like, i could not figure out where it is??? Thanks!

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Biggamehit
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passenger side ( well in ur case driver side lol)

fuse box... Under the box... cut and wire the plug together and thats it.

DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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There is a box (Im assuming) with 9 wires going into it from what i can tell from the wire diagrams. It has the park in nutral switch in it, it also sends to the transmission controll unit signals to what gear its it, triggers reverse lights, and sends signal to the starter. Ide like to find this unit.http://img293.imageshack.us/my...4.jpg

DropTopRB
Posts: 53
Joined: Mon Apr 02, 2007 3:29 pm
Car: 1993 240sx convertable, RHD, chargespeed s15 front end and wide body full kit, powerd by rb25det

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Well some good news i got it cranking tonight with the key, my problem was i had the wrong connector jumped, i jumped the connector with the white and black/yellow....wrong one!! Jumped black/yellow and black/white, cranked. Still no start though. im having an issue with the brown connector in the corner of the engine bay. According to the racebread conversion link, pin 4 green/orange is for the trans nutural switch to ecu, but there is no pin 4. There is however a green/orange wire comeing out of pin 5, but its not getting any signal. Also pin 6 black/yellow, for aac valve, and power to ignition coils is not getting any power. Where is the aac valve, and whats it look like?? Also what wire on the ignition coils does it get connected to??? And why is there no power?!?!? When i touch the black/pink wire(pin 7) with a test light i get low voltage and the second green relay in the fuse box(egi pump) clicks.When i touch red/black(pin 8) both the green relays click (egi pump and h/l ret cont). What does that mean?? is it normal?? I know there are alot of questions here but if anyone can answer any of these for me i would be very appreciative.


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