LS 1 Chev changed to LS 2 engine.

[Schalk]

I would like advice if the LS 2 engine can be triggered only with the Crank 58x Grey sensor. 

Must the cam sensor also be used?

[Adamw]

Without a cam sensor you would have to change to multipoint group injection and wasted spark ignition, the coils would need re-wiring into pairs.  

You can use the 58X crank with the half moon LS1 cam pattern if that is the reason you are considering not using the cam.  

[Schalk]

Hi Adam.

Please explain the LS1 cam pattern? I am not familiar with that. 

Or can I only use the cam sensor without the crank sensor

On the current setup only the LS1 on top of the block towards the rear is used. On the LS 2 it is moved to the front. Would the pin outs stay the same?

[Schalk]

With the current setup it is already on multipoint group and wasted spark. So in essence should I be able to use the LS 2 cam sensor with the correct pinouts in front of the engine?

[Adamw]

The LS1 has a 24 tooth wheel on the crank and a single 180deg long tooth on the cam or cam sprocket.  The LS2 has a 60-2 wheel on the crank and a 4 tooth wheel on the cam sprocket (2 short teeth, 2 long teeth).  

What Im saying is the ecu would be happy to use the LS2 60-2 crank trigger with the LS1 cam trigger.  

[Schalk]

The LS1 cam trigger is the long one on top off the block so won't work on LS2 block. It is in front on the LS2 block.

[Schalk]

Hi Adam,

I am stuck. The LS grey Crank sensor and the cam Sensor LS2 also front have the wiring changed as per the LINK recommendations. I do measure 4.8- 5V on both. I have done the coils spark test and it worked fine. But yet no spark when swinging the engine. I did see the trigger mode have a setting to change to LS2/LS7 with 90 deg. Should I change it or leave it ?

[dx4picco]

maybe post a trigger scope of the current setup

[Schalk]

Thank you. Will do so tonight

[Schalk]

The current setup on the LS2

TriggerScopeLog.llg5Trigger Scope - 2024-01-16 5;55;19 pm.llgx

.pclx

[Adamw]

Your scope capture shows the ecu is receiving the correct signal from the cam sensor on trigger 2 input, but it is receiving no signal from the crank sensor/trigger 1.   

 

Confirm the crank sensor is wired like below (different pinout to the cam sensor). This picture is looking into the sensor housing.  

[Schalk]

Hi Adam

Still no spark when cranking. I have actually changed the Crank trigger to the LS1 reluctor type and then got a signal. Unfortunatly I am not sure what to look for next. Please see latest Trigger scop and copy of setup.

Trigger Scope - 2024-01-18 6;18;41 pmsc.llgxsc7pmsc.pclx

[Adamw]

On 1/19/2024 at 6:51 PM, Schalk said:

I have actually changed the Crank trigger to the LS1 reluctor type and then got a signal.

The LS1 sensor wont work with the LS2 58X trigger wheel.  The LS1 sensor has two sensing elements internally that combine into a single output, it needs a special trigger wheel that is two wheels with different patterns stacked on top of each other.  

If the LS1 sensor gives a signal but the LS2 one doesnt, then that would suggest possibly the LS2 sensor is faulty - or there is an alignment issue internally. 

[Schalk]

Hi Adam

Thank you the engine is now running. The volt supply was too high on the LS2 sensor. The wiring was incorrect.