Boosted ls1 240sx pcm power question
08-05-2011, 08:21 AM
#1
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
Boosted ls1 240sx pcm power question Hey guys, Still trying to figure out the no spark issue, well I found the LS1 spark troubleshoot and in there it says : pin 20 and 57 must have constant power and pin 19 should be IGN switch power.
I checked mine and its the exact opposite, pin 20 and 57 are IGN switched power and pin 19 is constant, Also cils are getting power (12.7v) when cranking it drops to .564v (wierd number).
So my question is if these pins are getting power the wrong way what is the effect of it AND whats the cause for my power wire for the coils (both sides) to drop while cranking.
All help is greatly appriciated. Thanks
02NavyblueZ will be helping me with my wiring in a couple days.
I checked mine and its the exact opposite, pin 20 and 57 are IGN switched power and pin 19 is constant, Also cils are getting power (12.7v) when cranking it drops to .564v (wierd number).
So my question is if these pins are getting power the wrong way what is the effect of it AND whats the cause for my power wire for the coils (both sides) to drop while cranking.
All help is greatly appriciated. Thanks
02NavyblueZ will be helping me with my wiring in a couple days.
08-05-2011, 10:44 AM
#5
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
BTW I love your BMW so quiet yet wonderful power, very nice build.
08-05-2011, 10:50 AM
#6
Sounds like when your ignition switch go to crank position the coils are losing power. You need to get B+ to the coils all the time. I bet if you turn the key on and put a remote switch on the starter the engine will crank and spark.
Trending Topics
08-05-2011, 11:16 AM
#8
Go to a auto parts store and most of them have Noid lights in their loan a tool program that will tell you if they are pulsing by lighting up when the injector should be opening.
08-05-2011, 11:24 AM
#10
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
Yea Im gonna try that today. Although I found 5 blown fuses after replacing them Im smelling fuel everytime I crank the motor but my I had the fuel pump disconnected, maybe the fuel in the lines?
08-05-2011, 01:40 PM
#11
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
Check out our harnesses for this swap at www.Chasebays.com . All brand new wire, clips,and plugs! We make them plug and play for the 240sx and G/Z chassis.
08-05-2011, 02:43 PM
#12
Sounds like you have a wiring issue when you installed it.
The Coils & Injectors are powered from two fuses..one for each bank. They are hot with the key on, powered from the Fuse Box. The PCM needs to be wired like you describe.. 20 & 57 are 12v fuzed Constant Power, 19 is 12v fused with IGN(key on). Re-wire it like that.
The Coils & Injectors are powered from two fuses..one for each bank. They are hot with the key on, powered from the Fuse Box. The PCM needs to be wired like you describe.. 20 & 57 are 12v fuzed Constant Power, 19 is 12v fused with IGN(key on). Re-wire it like that.
08-05-2011, 06:16 PM
#13
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
Sounds like you have a wiring issue when you installed it.
The Coils & Injectors are powered from two fuses..one for each bank. They are hot with the key on, powered from the Fuse Box. The PCM needs to be wired like you describe.. 20 & 57 are 12v fuzed Constant Power, 19 is 12v fused with IGN(key on). Re-wire it like that.
The Coils & Injectors are powered from two fuses..one for each bank. They are hot with the key on, powered from the Fuse Box. The PCM needs to be wired like you describe.. 20 & 57 are 12v fuzed Constant Power, 19 is 12v fused with IGN(key on). Re-wire it like that.
Will do that,
I got a noid light from autozone, and no pulse from any injectors, I do have a aem injector driver connected as these are lucas 120lbs low z injectors.
also ran a remote switch to starter and cranking it with key on "on position" and I was getting 9.7v but still no spark when testing for spark from coils.
08-15-2011, 06:58 AM
#14
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
Sooooo, After re-wiring it to how its supposed to be and just testing all the wiring with "02navybluez" here's what we have found, the pcm isnt sending signal neither to the coils or injectors. Crank sensor? tested continuity from the crank plug to the pcm plug and solid connection, finally put a brand new (from GM) crank sensor and nothing still no signal from pcm.
Possible fried PCM, my hptuners is on its way back. What do you guys think "read entire"? Or swap pcm?
If my pcm is crap I just wasted 4 credits. gayyyyyyyyyyyyyyyy
Possible fried PCM, my hptuners is on its way back. What do you guys think "read entire"? Or swap pcm?
If my pcm is crap I just wasted 4 credits. gayyyyyyyyyyyyyyyy
08-15-2011, 05:42 PM
#15
Launching!
Join Date: Dec 2008
Location: Hammond,La
Posts: 206
Likes: 0
Received 0 Likes
on
0 Posts
not sure about all but i know from my experience theres a single (pink) wire that runs from the fuse box to the computer. give it power and it should solve alot of you problems
08-25-2011, 12:01 PM
#17
Launching!
Thread Starter
iTrader: (1)
Join Date: Nov 2010
Location: Baltimore,MD
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
ok, so re-living this thread. Here's what happen so far.
Still no aprak or fuel pulse, Checked all ground and fuses, for the longest HP tuners wasnt connecting so I had a extra AUTO Vette pcm sitting around plugged it in and still no connection with hp tuners, Then I tried connecting on a friends silverado and connected just fine.
Went back to the vette pcm and I looked over everything and I saw my serial pin was rounded out a little from sticking the DMM pin in there soo much, fixed the pin and it connected, So then I put the GTO pcm back in and no connection. I forgot to mention it has a brand new GM crank sensor now and the sensor has power and ground referance, cant check signal with a DMM (digital multi meter).
So what bad pcm??? also when trying to crank with the vette pcm there still wasnt any spark or fuel pulse. Pulse is being checked with a Noid light. Im sending the pcm back and getting a Camaro 6spd pcm. I dont if the GTO pcm is auto or manual but would it make a differance if its auto?
Its frustrating like hell, but im not giving up!! Any help would be appriciated
P.S. Ive heard and read that crank low referance is a ground but some people say it should have 5 volts running threw it, I actuall saw that in a thread where a LS1 swapped rx-7 was getting 5 volts to the low referance to the crank sensor. Does it have ground or 5 volts? If someone wants to check there LS1 its the middle wire in the plug. Thanks
Still no aprak or fuel pulse, Checked all ground and fuses, for the longest HP tuners wasnt connecting so I had a extra AUTO Vette pcm sitting around plugged it in and still no connection with hp tuners, Then I tried connecting on a friends silverado and connected just fine.
Went back to the vette pcm and I looked over everything and I saw my serial pin was rounded out a little from sticking the DMM pin in there soo much, fixed the pin and it connected, So then I put the GTO pcm back in and no connection. I forgot to mention it has a brand new GM crank sensor now and the sensor has power and ground referance, cant check signal with a DMM (digital multi meter).
So what bad pcm??? also when trying to crank with the vette pcm there still wasnt any spark or fuel pulse. Pulse is being checked with a Noid light. Im sending the pcm back and getting a Camaro 6spd pcm. I dont if the GTO pcm is auto or manual but would it make a differance if its auto?
Its frustrating like hell, but im not giving up!! Any help would be appriciated
P.S. Ive heard and read that crank low referance is a ground but some people say it should have 5 volts running threw it, I actuall saw that in a thread where a LS1 swapped rx-7 was getting 5 volts to the low referance to the crank sensor. Does it have ground or 5 volts? If someone wants to check there LS1 its the middle wire in the plug. Thanks
08-25-2011, 02:44 PM
#20
Man it sounds more like the wiring is fucked off to me..
Make sure you have power on the pins that I mentioned up in my other post.. for the PCM to communicate with HP Tuners you need PCM Blue 58 to go to Pin #2 on the OBDII DLC. On that there should be 4 wires.. #2 is the Serial Data for the PCM, #4 & #5 are grounds, #16 is 12v Constant off of the battery.
No power to the Coils is just a pink wire that needs to be powered from the Fuse Box.
Check continuity on the Crank Sensor wires..make sure they are going to the correct spots on the PCM.
Who built the Harness?
Make sure you have power on the pins that I mentioned up in my other post.. for the PCM to communicate with HP Tuners you need PCM Blue 58 to go to Pin #2 on the OBDII DLC. On that there should be 4 wires.. #2 is the Serial Data for the PCM, #4 & #5 are grounds, #16 is 12v Constant off of the battery.
No power to the Coils is just a pink wire that needs to be powered from the Fuse Box.
Check continuity on the Crank Sensor wires..make sure they are going to the correct spots on the PCM.
Who built the Harness?