Swank Force One
Swank Force One MegaDork
3/3/13 5:24 p.m.

Trying to find schematics/diagram for the CPS on this motor.

Found this.

Is CKPRTN the signal, and CKP2 12V+?

crazycanadian
crazycanadian New Reader
3/3/13 5:55 p.m.

Looks like CKP2 is the signal and CKPRTN is referance voltage..

Swank Force One
Swank Force One MegaDork
3/3/13 7:18 p.m.

Thanks! How sure are we and what's your source?

crazycanadian
crazycanadian Reader
3/3/13 10:07 p.m.

I was partially wrong now that I double checked which sensor you are talking about.. That diagram is miss leading...

The crank sensor on the 2.5's down at the crank shaft is a VR sensor, not a Hall effect sensor... It has no reference voltage... CKP2 is the (+) side of the signal, CKPRTN is the (-) side of the signal... both feed back to the computer... Ground is the shielding wire that wraps around both wires and gets grounded to either the block or chassis.. they do this to reduce the noise i the circuit..

The green trace is what the signal looks like when using the older DE 6 point crank balancer...

For a fun challenge... The complete capture is 10ms long... On the green trace there are 6 spikes per 1 revolution of the engine.. The spikes are all evenly spaced.. Approximately what rpm was the motor spinning when I took that capture.. :)

Swank Force One
Swank Force One MegaDork
3/3/13 10:27 p.m.

4000rpms.

10ms = 4 spikes
60000ms = 24000
24000 / 6 = 4000

Thanks for the help!!!!

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