Tach Signal Problems.

[whiteboyz]

Ok so first off Happy 4Th Of JULY everyone.
Ok so after my motor swap my tach has stoped working, I replaced the PT, and still does not work. i just installed an safc2 and i have no tach signal to that either. BUT if i hook up my OBD2 scanner i have tach signal in there ? WTF so for the life of me i can not figure out why i have no tach signal. is there any place else to get a signal from ? It just makes no sense that my scanner gets RPM signal but my safc nor my tach does.

 

[gofer]

Brian,
Pin 58 (white wire) is the RPM signal wire so you can check your connection there at the ECU. I'm not sure how you tapped into that wire installing your SAFC but it could have gotten ripped out from the SAFC wire and the ECU wire as well and your scanner gets the signal from somewhere else. 2g ECU Pinout

May I ask why that SAFC is still connected when your running link?

 

[whiteboyz]

Corey,
Yeah I checked that. I just stripped back the coating a bit and then connected it. I just can not figure out why i have no RPM signal. I have replaced the PT 2 times and still no luck with a working tach. And there is no way for me to check for signal at the PT for the tach. I even replaced my ecu a couple times but that did not change anything. .

And I no longer have link I blew my rear end, So I traded my link for a rear end So now I have to use the SAFC to tune my car. Soon I will have link again. V3 though next time.

Brian,
Pin 58 (white wire) is the RPM signal wire so you can check your connection there at the ECU. I'm not sure how you tapped into that wire installing your SAFC but it could have gotten ripped out from the SAFC wire and the ECU wire as well and your scanner gets the signal from somewhere else. 2g ECU Pinout

May I ask why that SAFC is still connected when your running link?

 

[spydergotboost]

i believe the obd2 scanner can get rpm from the CAS that might explain that but as for the rest of it, im sorry i got nothing coming to mind. but all i can say is good luck.

 

[gofer]

I've been doing some wire chasing of my own and might have something for you Brian. That white wire coming from the PT to the ECU (pin 58) branches off into the dash wiring harness connector. It runs into the white 18 pin connector behind the stereo, it's on the far left side in the row of connectors back there. My guess is that the dash cluster tach gets it's signal through that plug so you might check there or ohm it out to verify continuity...

 

[whiteboyz]

Corey, Thanks brother I'll check that out. And see what I can come up with. I'll have to check alldata to see what they say about continuity for that harness. I browsed through there once but did not look for to long had to run out the door.

I miss my dsmlink sooo bad. tuning with an safc2 is no fun hahaha. especialy when I get no correction signal either . As always Corey thanks a bunch.

I've been doing some wire chasing of my own and might have something for you Brian. That white wire coming from the PT to the ECU (pin 58) branches off into the dash wiring harness connector. It runs into the white 18 pin connector behind the stereo, it's on the far left side in the row of connectors back there. My guess is that the dash cluster tach gets it's signal through that plug so you might check there or ohm it out to verify continuity...

 

[TJCTalon]

Is pin 58 where I would tap for my shiftbox for my automatic? Instructons say to tap the tacho out put from ecu but all the pinouts I see never actually say tacho output.

 

[gofer]

The shiftbox gets wired into the TCU harness not the ECU. What shiftbox did you get, the RoadSurge unit?

 

[TJCTalon]

Forced four. The shift box instructions call for one wire to the ecu for tacho

 

[gofer]

Forced four. The shift box instructions call for one wire to the ecu for tacho

ForcedFour Basic Install Instructions

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Wiring instructions:

IMPORTANT NOTE: If used with a TCU or other method of controlling the transmission, follow the instructions closely. Only one way of controlling the transmission should be powered on at one time to prevent unexpected control of the transmission or damage to the TCU. Use the supplied switch to switch between transmission controls or substitute a suitable relay. Updated!
If the transmission shifts from 1st to 4th to 3rd to 2nd, then the shift solenoid wires are reversed
Using the Shift Box BASIC/PLUS as a standalone transmission controller:

Red wire is +12 volt power from the ignition switch
Black wire is ground, connect to a good clean chassis ground
White wire splices with the Tacho output from the ECU
Yellow wire goes to the Shift Solenoid A
Brown wire goes to the Shift Solenoid B
Optional wires for external shifter control:
White/Black wire is the shift input common (sensor ground) for use with an external shifter
Purple wire is the up-shift button (short to white/black wire to perform up-shift)
White/Purple wire is the down-shift button (short to white/black wire to perform down-shift)
Any remaining wires should be capped
Using the Shift Box BASIC/PLUS with TCU or other transmission controller:

Red wire is +12 volt power from the ignition switch, connect as follows using switch harness

* NOTE: On the fuse block there are 2 wires from the TCU fuse, both must be cut and spliced together through the supplied switch harness to prevent the TCU from being powered when the shift box is being used.
Red wire to Green switch harness wire
Yellow switch harness wire to fuse block harness (Power from TCU fuse)
Brown switch harness wire to fuse block harness (This will power the TCU)

Black wire is ground, connect to a good clean chassis ground
White wire splices with the Tacho output from the ECU
Yellow wire goes to Shift Solenoid A
White/Yellow wire goes to the TCU Shift Solenoid A output
Brown wire goes to the Shift Solenoid B
White/Brown wire goes to the TCU Shift Solenoid B output
Optional wires for external shifter control:
White/Black wire is the shift input common (sensor ground) for use with an external shifter
Purple wire is the up-shift button (short to white/black wire to perform up-shift)
White/Purple wire is the down-shift button (short to white/black wire to perform down-shift)
Any remaining wires should be capped