the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

03 maxima tach signal problem


Post ReplyPost New Topic
< Prev Topic Next Topic >
red85 
Member - Posts: 31
Member spacespace
Joined: January 05, 2008
Location: Ontario, Canada
Posted: January 29, 2008 at 5:39 PM / IP Logged  
I'm having trouble getting a tach signal on an 03 Maxima.  I wired into the instrument cluster - no dice.  I wired into the ECM - no dice.  Injector - same result.  Coil -you guessed it.  The issue is that during the tach learning procedure the rs learns the signal just fine but when it comes time to start with the rs, the diagnostic flash is showing that there is no tach signal.  I'm using a ProStart 3300 if that helps at all.  All I get when using the rs is a short crank of about 1.5 seconds.  Any ideas about what to do with this?  ps I am doing this with the key in the ignition cylinder so I doubt it's a security issue.
perly 
Copper - Posts: 155
Copper spacespace
Joined: April 24, 2004
Location: Canada
Posted: January 29, 2008 at 5:43 PM / IP Logged  
you have probably already checked this but did you hook up both starter wires?
red85 
Member - Posts: 31
Member spacespace
Joined: January 05, 2008
Location: Ontario, Canada
Posted: January 29, 2008 at 6:02 PM / IP Logged  
Yup.  Both are hooked up.  I metered both of them to make sure.  Thanks though.  Any help is appreciated.
perly 
Copper - Posts: 155
Copper spacespace
Joined: April 24, 2004
Location: Canada
Posted: January 29, 2008 at 6:06 PM / IP Logged  
ok then..... if it is saying that it has not learned tach then does the prostart have a "tachless" mod. if so you can try that just to ensure that it is a tach issue and nothing else.
chadwa2003 
Copper - Posts: 353
Copper spacespace
Joined: January 08, 2005
Location: Canada
Posted: January 29, 2008 at 7:02 PM / IP Logged  
Are you metering your tach output because i've seen units program what you would think is a tach signal but then shut down within 10 seconds of start. Other than that it is most likely a problem with the unit. Best of luck
Chris Luongo 
Platinum - Posts: 3,746
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: January 29, 2008 at 9:40 PM / IP Logged  
What did you use at the ECM, WHITE/ green right? I think there's a couple of WHITE/ green wires in there, so it's good to test carefully.
I find the ECM's plug, on the passenger side of the center console, kind of difficult to work with.
On the left side of the center console (to the right of the gas pedal) is a small black plastic panel, held in place by two clips. You don't have to remove that panel, but if you insert your hand just above it, you'll feel (and can see) the thick ECM harness.
Putting your fingertips on top of that harness, move your hand toward the rear of the car. There's a smaller bundle of wires you'll bump into, that runs kind of upward, behind the climate control panel and radio.
That harness should have just enough slack to pull it out from there, and cut open the tape.....in there should be only one WHITE/ green, which is tach.
red85 
Member - Posts: 31
Member spacespace
Joined: January 05, 2008
Location: Ontario, Canada
Posted: January 30, 2008 at 9:13 AM / IP Logged  
thanks Chris.  I'll give that a shot..
Chris Luongo 
Platinum - Posts: 3,746
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: January 30, 2008 at 10:25 AM / IP Logged  
Wait!
I'm really sorry. I just remembered that the 2003 is the new style, right? It looks the same as a 2004-2008 Maxima, right?
In that case, I gave you the wrong information. The information I gave you was for the 2002 style car.
Sorry about that. Hope you get to read this before tearing the car apart again.
I think from 2003-up, there's no tach signal inside the car. The injectors and coil packs go to the "engine room ecu," which then communincates with other modules inside the car via databus.
If you switch to a bypass module from www.idatalink.ca, their modules have a tach output, which works very well in my experience. (The Fortin CAN-SL2 has a tach output, but it's not reliable.)
But I've always used voltage sense on those cars, without problem.
If you program your unit to 0.8 seconds crank time, it'll start perfectly, with a slight risk of requiring two tries when it's cold out..........if you program for 1.0 seconds crank time, it should start in any weather, but with a slight (almost inaudible) overcrank.
morteza 
Member - Posts: 25
Member spacespace
Joined: July 20, 2007
Location: United States
Posted: January 31, 2008 at 12:33 PM / IP Logged  

no Chris, i believe the 2000-2003 are the same bodystyle. the 2002 info you quoted should be the same as the 2003. 2000-2001 was the VQ30 motor and has all the wires at the SECU (lock, unlock, etc). while on the 2002-2003 i think you have to go into the doors, or use an empty SECU pin?

but, from what i know, the 2002 should be the same as the 2003

morteza 
Member - Posts: 25
Member spacespace
Joined: July 20, 2007
Location: United States
Posted: January 31, 2008 at 12:42 PM / IP Logged  
morteza wrote:

no Chris, i believe the 2000-2003 are the same bodystyle. the 2002 info you quoted should be the same as the 2003. 2000-2001 was the VQ30 motor and has all the wires at the SECU (lock, unlock, etc). while on the 2002-2003 i think you have to go into the doors, or use an empty SECU pin?

but, from what i know, the 2002 should be the same as the 2003

sorry for the vagueness, in maxima.org terms 2000-2001 is considered 5th gen, 2002-2003 is considered 5.5 gen. They look almost exactly the same but there is a motor and wiring difference as you know. 2004-up is 6th gen, thats the rounded (bubble-like) body--style

Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Thursday, March 28, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer