Does someone know how the Tach on a '96 Sunfire (2.2L) gets its signal ? I know it comes through the data lines from the PCM to the I/C PCM. But how does the PCM get the info ? Is it from the Crank Sensor 7X wire ?
what do you need to get the signal for? i know how to get the tach signal. not sure what you are trying to do with it but im not gonna tell you til i know you arent' going to nuke your car.
lmao, funniest reply of the day.
dirty elf wrote:lmao, funniest reply of the day.
+1
car audio noob since 1984.
hhmmmmmm am i missing something
Quote:
what do you need to get the signal for? i know how to get the tach signal. not sure what you are trying to do with it but im not gonna tell you til i know you arent' going to nuke your car.
I'm not going to nuke it, but I did blow-it with a Pontiac 3800SC V-6. I want to use the stock gauges, and want to feed a signal from the V-6 to the Tach somehow. I have the FSM's for the Sunfire and a Chilton for the V-6, but I'm still lost here.
Dark green wire with white stripe is the VSS output from the PCM to the cluster (on 95-99 cars at least). It's pin B2 on the Pontiac, B3 on the Chevy.
I don't think you can drive the Sunfire cluster with the L67 PCM... everyone else that's done the swap had to swap the gauges too. I will be doing that anyway...
I see N8Ball2013 didn't bother to answer. He must have just felt like taking his "Cheap Funny Shot" then running -or- he doesn't KNOW the answer.
I bow to the "Lenko" who knows...
So, John. The VSS wire (C3-01) not only feeds the PCM info for the Speedometer and Cruise, but the Tach too ? Where does the PCM pull the Tach info from ? The Blue/White wire (C2-32) on the CKP ?
BTW John... You have an invalid pointer (line 43) on you web page. Can't go to the forum you setup.
If you're swapping from 4 to 6 cylinder tach reads differently, so it won't work.
I refuse to accept that. GM PCM's work the same or close. They all communicate from point2 point. All you have to do is find the point. Now, the 7X won't match the 15X, but an adaptor could fix that.
96-99 Pontiac cluster pin-out:
Pin Wire Color Circuit No. Function
A1 ORN 1440 Fuse Output (Battery)
A2 TAN 800 Serial Data Signal (UART), 8192 Baud, Primary
A3 PNK 1020 Fuse Output (Off/Run/Crank)
A4 LT BLU 14 Turn Signal lamp Feed, Left Front
A5 BLK 150 Ground
A6 BRN/WHT 1571 Traction Control System Switch Signal
A7 LT GRN 592 Daytime Running Lamp Relay Output (Coil)
A8 BRN/WHT 419 CHECK ENGINE Indicator Lamp Output
A9 GRY 8 IP Lamp Feed
A10 -- -- Not Used
A11 -- -- Not Used
B1 -- -- Not Used
B2 DK GRN/WHT 817 Vehicle Speed Signal (4000 Pulses/Mile)
B3 PNK 1200 Headlamp Output (High Beam)
B4 BLK 1350 Ground
B5 PPL 30 Fuel Gauge Sensor Signal
B6 -- -- Not Used
B7 DK BLU 1201 Headlamp Output (Low Beam)
B8 DK BLU 15 Turn Signal Lamp Feed, Right Front
B9 BLK/WHT 451 PCM Ground
B10 LT GRN/BLK 66 Air Conditioning Switch Output
B11 LT BLU 1134 Park Brake Switch Signal
I bet it has something to do with the Tan wire (A2) which goes from the PCM to the Cluster.. that tells it all it needs to know. What year is the L67 out of?
So you refuse to accept that, hmmm, then why would there be separate settings on a 4 cylinder engine for an aftermarket tach, separate for a 6 cylinder engine, and 8 cylinder engine? Hmm, the extra spark plugs and coil pickups don't mean anything, sorry I'm just dumb and I forgot you already know it all.
Lanman... Are you related to N8Ball2013 ? You both want to put people down rather than help them like John...
not about putting people down. John gave you the answer. what more do you need. im pretty sure ive helped more than my fair share of people here and so has jeff Btw in case you missed it this is his answer
I don't think you can drive the Sunfire cluster with the L67 PCM... everyone else that's done the swap had to swap the gauges too. I will be doing that anyway...
Actually I am. Nate is my brother from another mother
I looked at the Grand Prix wiring... and that same Tan wire for the UART signal is present... you know, it just might work
But only if you are using a GP L67 PCM... I know my Park Avenue is wired slightly differently... it has the BCM, so it's got the Class 2 wiring (unlike the GP until.. 04?)
I still don't think it's going to work because a 4 cylinder tach and 6 cylinder tach are two completely different animals.
Guys, thank you for helping.
