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SR20 CAS - Crank Angle Sensor.

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Another silly SR20 question.


With the crank posistiin sensor on the side of the cylinder head.  It has 4 wires.  I know which when looking into the plug.   

1st pin is 0v -. 

2nd pin s Ign 12v +.  

3rd pin is 360° tooth. 

4th pin is 4 tooth.


Q.  Which do I use as trigger 1 and trigger 2 on the Link ECU? 32295478530_91405b6d28_k.jpg

(Forgive the newb question.  Im sure this has been covered one billion tomes before.  But i couldnt find anything specific to the way the link ecu works with a quick search through the net or on the forums.  So though it easier to ask.)

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Appreciate it mate.


I was gonna presume that be the case.  But may aswell ask before i terminate the wire/pin into the plug.  

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dont forget to follow the instructions to configured that sensor on the software, is very easy to do but it have to be done or the engine wont start:


The Nissan 360 Opto Trigger Mode is designed for use with Nissan optical Crank Angle Sensors (CAS) that have 360 evenly spaced slots and 4,6 or 8 different width slots. Digital trigger decoding uses all of the 360 slots to achieve precise engine position calculation.


Of the 4, 6 or 8 slots, one will be wider than the others. This Widest Slot is used by the ECU to determine the engines position in the firing order. As the width of this slot varies depending on the exact CAS used, an automated setup procedure has been provided.


Note: THE ENGINE WILL NOT START when Test ECCS Sync is turned ON.


Setup Procedure:


Setup ECCS Trigger Decoding as follows (Read the entire process and ensure you understand before starting):


1.Ensure the 360 slot signal is wired to the ECUs Trig 1 input.
2.Ensure the 4,6 or 8 slot signal is wired to the ECUs Trig 2 input.
3.Switch the key on, do not start the engine.
5.Ensure all Configuration options are correct.
6.Under the Fuel heading, select Fuel Setup. Set Injection Mode to OFF. This will prevent the engine from starting.
7.Under the Triggers heading, select Trigger Setup.
8.Select Nissan 360 Opto as the Trigger Mode. Note that this will initialise all trigger inputs to default values. The default values are as follows:
·Trigger 1:
·Trigger 1 Type = Optical/Hall
·Trigger 1 Pull up = ON
·Trigger 1 Filtering = Level 1
·Trigger 2:
·Trigger 2 Type = Optical/Hall
·Trigger 2 Pull up = ON
·Trigger 2 Filtering = Level 1
9.Select the resolution mode. Select Low Res Mode = ON for engines with aggressive cam shaft profiles or lightweight flywheels. This will provide improved timing stability on engines that have large variations in CAS rotation speed per revolution.
10.Set Test ECCS Sync to ON. This will put the ECU into a special mode where it will automatically calculate the position of the widest slot. Note that in this mode the ECU will disable both fuel and ignition. Enabling this function will also initialise the ECCS Widest Slot value to 0.
11.Open the Triggers/Limits tab of the Runtime Values window (F12 key).
12.Crank the engine. This will start the widest slot calculation procedure. This procedure will take about 4 seconds. If the procedure executes correctly, the following should be observed:
·The Trig 2 Signal run time value will display YES first, indicating the ECU detects a correct 4, 6 or 8 slot trigger signal. If this value displays as NO during cranking, check sensor output and wiring.
·Trig 1 Signal runtime value will then display YES, indicating the ECU detects a correct 360 slot trigger signal. If this value displays as NO during cranking, check sensor output and wiring.
·Finally the ECCS Sync runtime value will display YES when the process has finished.
·ECCS Widest Slot will change from zero to a value indicating the width of the slot (typically between 5 and 25).
13.If after 10 seconds of cranking the ECCS Widest Slot value is still zero, an error has occurred. Recheck all trigger wiring and test the CAS output. If this is OK, repeat the entire procedure.
14.If the process completed successfully, switch Test ECCS Sync to OFF.
15.Remembering that the Injection Mode is still set to OFF, crank the engine and check that a stable engine speed (RPM) is obtained and the value is consistent with a typical cranking speed.
16.Set Injection Mode back to the desired option.
17.If all is OK, perform a store to permanently save all settings to the ECU.
18.Set the base timing before attempting to start the engine (DO NOT JUST TRY STARTING THE ENGINE!).




I just copy paste the info that you can find on the help section of the software, is really usefull you should try it you will probably learn about a lot of stuff searching for your answers.


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Im sure i searched the PC-Link help file.  But i didnt see that anywhere.  But,  yes,  that looks like a needed piece of info.


Still a fair ways off doing that step yet.  Im doing a top to bottom re-wire of the entire car.   (KE20 Corolla)  So all body electrics,  plus complete wire in of the engine management.   Every OEM Nissan connector was sourced from EFI Hardware for the SR20, so no cut and splicing on the engine wiring, i can terminate directly into the OEM components.  1NZ Yaris COPs.  Large circular bulkhead connector for the engine wiring pass-through into the cabin.  And everything is top notch components.  ETFE wires, harness-flex conduiting, dual-wall shrink, Deutsch connectors throughout - Every size DT, DTM, DTP, DTHD, HD30.  

Every harness can be unplugged and removed if need be.  Im about 75 hours into it now.  And realistically thats about 3/4s of the way there.  Im full qualified auto sparky.  But this is only the second Link ECU ive wired in.  My Subaru being the first.

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