Here's a tricky one..

[cooolkid]

All of the info I found is automatic to manual while keeping the automatic ecu. I need help for my specific problem.

I've swapped an 87 n/a 5sp into an 89 turbo automatic shell. After repinning my harness to work with the body plugs, my fuel pump turns on as soon as the key is turned to the "on" position. I honestly don't mind that; however, I cannot start my car with the key. I have codes 12 and 43.

I'm having horrible cold start issues, I believe this is all caused by not having a clutch switch to complete the circuit. I remember jj saying something about the ecu not getting sta signal and it can cause cold start issues.

My apologies if I didn't include enough info or missed something. It's 3am. Any input on how I can get these codes cleared up? (in case anyone is wondering I have a switch wired to my bosch relay that connects to the starter)

 

[IJ.]

Did you bypass the NSS?

 

[gaboonviper85]

So you swaped just the transmission or the motor and all?

Your post makes little sense...reword it with more detail please

code 12 is RPM signal which is either your cps (turbo) or distributor (na) rpm signal wire is messed up.....43 is starter signal which I can't explain what will happen with this code.

 

[cooolkid]

I swapped my 87 motor, ecu and transmission. My ecu is an 87 manual ecu, I'm not sure how I'd deal with a NSS if one isn't present. My clutch has no connector going to it at all.

 

[jetjock]

Not so tricky. ECU input STA must go high whenever the key is turned to the start position. This is normally done using the same signal applied to the starter solenoid. Check the wiring IJ mentioned or or just add a new line anywhere from the start signal to STA. The right side footwell would be a good place since it's near the ECU and contains the starter relay.

If STA doesn't go high several things won't happen but the most important will be no asynchronous injection (lack of starting enrichment) and initial timing won't be output. Furthermore, due to the way the ECU processes faults, the code 12 may go away when the STA issue is corrected. Note I said "may"...

 

[cooolkid]

Not so tricky. ECU input STA must go high whenever the key is turned to the start position. This is normally done using the same signal applied to the starter solenoid. Check the wiring IJ mentioned or or just add a new line anywhere from the start signal to STA. The right side footwell would be a good place since it's near the ECU and contains the starter relay.

If STA doesn't go high several things won't happen but the most important will be no asynchronous injection (lack of starting enrichment) and initial timing won't be output. Furthermore, due to the way the ECU processes faults, the code 12 may go away when the STA issue is corrected. Note I said "may"...

I kind of feel like you just told me the problem. I have a feeling I didn't understand entirely what I was doing when I did the repinning. Before I repinned the engine wiring harness, it would crank with just the key.

I warmed the car up today, drove it around, checked for codes (12,43), cleared the codes and I'm only getting code 12 now that it will start first try. I leave the key on the on position, my fuel pump turns on, and I use a button to turn the starter. When I clear codes and start the car in diag mode I instantly get code 12. What exactly is code 12 caused by?

 

[jetjock]

I did tell you the problem but here's some info from the TSRM anyway:


12, RPM Signal

Diagnosis

* No "NE" or "G" signal to ECU within 2 seconds after engine has been cranked.

Trouble Area:

* Distributor, or CPS, circuit
* Distributor or CPS
* Starter signal circuit
* ECU

I dunno how you wired that starter button but STA needs to go high (12 volts) whenever it's pushed. And the fuel pump isn't supposed to come on with the key. It shouldn't come on until the engine is cranked...

 

[cooolkid]

I did tell you the problem but here's some info from the TSRM anyway:


12, RPM Signal

Diagnosis

* No "NE" or "G" signal to ECU within 2 seconds after engine has been cranked.

Trouble Area:

* Distributor, or CPS, circuit
* Distributor or CPS
* Starter signal circuit
* ECU

I dunno how you wired that starter button but STA needs to go high (12 volts) whenever it's pushed. And the fuel pump isn't supposed to come on with the key. It shouldn't come on until the engine is cranked...

The key has to be on the on position so I can get spark, the starter will turn as soon as the button is pushed regardless of key. pretty much like hot wiring it, just a button in place. My fp gets 12v when key is on... I don't mind that and actually kind of like it. How can I get STA 12v without turning the key to the start position, is it possible to send 12v safely to the ecu when I use my starter button?

 

[IJ.]

If you bypassed the NSS circuit the stock key should work....

 

[Moy]

Are you using the n/a ignitor?

You'll have a clutch safety switch (CSS) underneath the dash board (remove panel under steering column with heater duct). There will be a white two wire plug hanging near where the clip on the clutch pedal bracket is. That clip is your CSS. If you insert the ends of the paper clip into each spot on the hanging plug, that will effectively bypass the CSS.

 

[cooolkid]

Are you using the n/a ignitor?

You'll have a clutch safety switch (CSS) underneath the dash board (remove panel under steering column with heater duct). There will be a white two wire plug hanging near where the clip on the clutch pedal bracket is. That clip is your CSS. If you insert the ends of the paper clip into each spot on the hanging plug, that will effectively bypass the CSS.

Aren't CSS in manual chassis only? There was one my in 87 manual that I pulled my motor out of but I havent seen one in my 89 automatic. I'm going to look at what IJ just said I think I moved a wire to the wrong position because before the key would turn the starter, and since I redid those pins other things happen... like the FP turning on. I'll relook over my b1 plug

 

[cooolkid]

Okay heres what I don't understand. I'm using a manual ecu(where is there a NSS circuit?), on my B1 connector, I moved the black and blue wire to match the body harness plug. On my harness there is black and blue and black and orange(the bigger connectors in the center of B1) but on my body harness there is black/blue, black/orange and black/white. I'm assuming black and white is the NSS? When I tried moving my black and blue to match white and black my FP does not work. I'm so confused...but atleast the car is running ^^ still have code 12.