1g CAS question.

[craziloki]

So here is my question. I have a 98 ECU, the motor I am putting in is I'm assuming a 95-96 because the CAS and crank sensor plugs are both on the driver side of the engine. I have made my harness and installed the blacktop CAS. Will I have to change any pins in my ECU? or can I just plug the harness in? Also, not every forum says the plug wires need to be swapped.. Some assistance please......

 

[rush2252]

Some misinformation here. You have a 98 ECU correct? Your motor is a 95-96 bolt because you state the plugs are on the driver side. But you installed a 1g CAS???

Im a little confused as to what your question is. You will either use the CAS or the 95-96 cam and crank sensor but not both. As for the ECU running the car let us know which method your going to use for ignition signal i.e the blacktop CAS or the 2ga CAM and Crank Sensors

Here is a pic of the 95-96 CAM and Crank sensor setup. Unlike the 2gb 97-99 which has a Cam sensor or CAS on the rear passenger side of the head but not to be confused with the 1g or 6bolt CAS which is larger and utilized both the TDC and Cam angle sensors in ONE unit.

 

[snowborder714]

He made the harness which will allow him to use the 1g CAS.

I would say try the plug wires in both configurations and see which one runs better.

 

[craziloki]

It is a 7bolt motor. I am not planning on using the crank sensor on the motor. I am going to use the blacktop I installed. I made the harness according to RRE Instructions. Plugging the CAS and crank sensor together then into my 2g harness. My question is do I have to swap anything on my ECU? Some forums say to, some dont mention it at all.. Same thing with plug wires...

 

[craziloki]

Thanks Brian....
What about changing pins in my ECU? is that necessary?

 

[rush2252]

Heres a link to firing orders if ya need any help. Assuming your wiring is correct based off of brians statement you should be set

http://www.dsmtuners.com/forums/problem-diagnosis/10465-firing-order-merged-5-7-a.html


Kolby

 

[craziloki]

On the magnus website:

Cam Angle Sensor Wiring Diagrams
Wiring Instructions
1. Make a wiring harness.
Due to the inverted Cam signal, injector trigger wires will need to be switch on 95-96 year ECU cars with this
wiring diagram in order to bring the signals back into phase. The difference is subtle, but the motor will start
easier, provide smoother idle, and have less hesitations during mild acceleration.
Use the following diagram:
When removing the pins on your ECU wiring harness be patient and delicate. It requires no force to remove
the pins. Consult the diagram in the front of your electrical service manual regarding the proper way to
inspect and remove pins. You will need a tiny jewelers screwdriver, (1/16 in) to release a plastic catch holding
the pin's in. Use a flashlight and take a good look at the harness before beginning.
Green: Pin 1 is now 14
Green w/ yellow stripe: Pin 2, is now Pin 1
Green w/ red stripe: Pin 15, is now Pin 2
Yellow w/ black stripe: Pin 14 is now Pin 15
Refer to the final page of this document for all ECU pin allocations
The spark coil signal is inverted. Looking at the coils, label each wire A,B,C,D. Change the spark plug wire
locations: A is now C, B is now D, C is now A and D is now B. Another way to do this is to change the trigger
wires to the coil, (3 wire triangle plug, next to the igniter). Switch the two blue wires. One is blue with red
stripe, the other is blue with black stripe. The third wire that remains unchanged is black with white stripe.

Im thinking this only pertains to 95-96 ecu cars? Not me because I have 98 ECU?
Thanks for the input Kolby!!

 

[snowborder714]

I don't believe you need to swap ECU pins either.

 

[craziloki]

So is the whole idea: The CAS is picking up power from the crank sensor then sending both signals through the one white wire to the ECU?

 

[snowborder714]

From the crank and cam sensor plugs, there has to be more than one wire that runs to the ECU. Did you follow this diagram?
RRE Instructions

 

[rush2252]

If your using the 1g CAS it should provide Cam Angle and TDC it takes the place of both CAM and Crank Position Sensors and applies them to ONE unit.

Here instead of linking and possibly confusing you more due to misinformaiton and nonsense of the thread I quoted myself from.... This Applies ONLY to the 1g CAS as the 2g setup is different they have a seperate TDC and CAS

"The Crank Angle Sensor and the Top Dead Center Sensor are located on the right side of the cylinder head. These sensors are incorporated into one unit, being a disc and a pick-up unit. The disc is affixed to a shaft that is coupled to the camshaft and the light-transmitting unit is mounted stationary to the units housing.

Crank Angle And #1 TDC Sensor


The disc contains 4 large slits around its circumference to indicate the crankshaft angle. An additional light-transmission slit located inward from the edge is used to indicate number one cylinder's top dead center position. The pick-up unit assembly uses two luminous diodes and two photo diodes, in order to detect the two different slits. There is a very slight clearance between the luminous diodes and the photo diodes, and the disc rotates within this space.

As the shaft rotates the slits at the discs edge pass between the light and the optical reading part of the unit. The light emitted from the luminous diodes pass through the slits to the photo sensing diodes. When the photo diodes receive the light, they become conductive and generate a signal, which is sent to the Control Unit.

The Control Unit is able to detect number one cylinder TDC by the signal generated through the single inner slit on the disc. The sequence of the fuel injector firing is based on this signal.
The slits at the outer circumference of the disc represent the exhaust stroke and serve to detect the position of the crankshaft (and, therefore, the piston) relative to top dead center.
Based on these signals, the Control Unit is able to determine the fuel injection pulse width, ignition timing, and also the intake air flow rate for each revolution of the engine."


alldata.com


Hope this helps
Kolby


***Edit brian beat me to it

 

[craziloki]

Yes, isnt the white wire the only one actually going into the harness? Therefore I can splice that into the harness? All other wires are between themselves right?

 

[craziloki]

Oh Kolby you lost me...
That is much more information than I needed to know... Thank you though!!

 

[rush2252]

Sorry. Basically I was correcting your assumption that the CAS gets its signal from the crank position sensor. The CAS is the CRANK sensor. Your basically not using anywiring from my previous pic on the 95-96 setup. You will wire the 1g CAS up like brians link to the 2g existing connectors. The CAS provides both cam angle and top dead center of the Crank.



Hope that clears up my point

 

[craziloki]

Right, But I still plug the triangle plug into the crank sensor plug so therefore I am still using that sensor on the other side. The signal is just transmitted through the CAS and both signals follow through the white wire going back through my harness?

 

[rush2252]

Magnus Motorsports check out their harness they sell prebuilt. Its the one used in brians reference from RRE.

From my pic above the two connector plugs on the motor side is not going to be used. These are the ones you are going to cut off and make your harness with as in this link brian already posted RRE Instructions. Once your done plug and play all the way FTW
Kolby

 

[craziloki]

Ok I think I have found the confusion... i am using the female end of the triangle plug, because I had an extra one laying around. I was thinking that I plug that into the original crank sensor. I am now seeing that I am to use the male end on the motor for the harness and plug that directly into my harness (not into a plug). Is this correct now?

 

[rush2252]

Okay. Im not outside at my car and dont remember which end is male or female. BUT I do know you will cut and use the two connectors referenced in my pic that USED to go to the CAM and Crank sensor IF you have the 95-96 block. Fab up the harness using these two and plug into the chassis harness.

You should be good from there assuming your wiring is correct