CPS Wiring issue

[aguiarjason]

I have not been able to get spark or fuel, I've already replaced almost everything but the coil. I changed the CPS and still have 540 at the CPS pins, but when i check the pins from the ecu its only receiving around 0.07. This means the wiring loom is shot right? I just want to be sure before I start pulling it all out.

[TobyB]

What are you metering? Ohms?

You should see 0 ohms with throttle closed, hopping up to infinity when off idle.

It's just a switch.

Conversely, with the ignition on, you should see no voltage across it throttle closed,
jumping to 5v off idle.

If it behaves the opposite way, you've found the WOT switch, which should do approximately the reverse.

http://www.wedophones.com/BMWManualsLead.htm

hth

t

[HerbE30]

Toby man... You're slackin! He is referring to Crank Position. You're referring to Throttle Position. I'm just happy to catch you slippin'.

Jason. Is it a genuine sensor or at least a better brand name?? I believe I would replace that section of the loom, or make sure the PINs are clean and clear. I know some people have issues with breakup at higher RPM and people run a 10k resistor, but that is mostly people running stand alone, so I would avoid that.

Either way, in this order
1 Check PIN condition
2 Replace offending wires in loom

[aguiarjason]

Toby man... You're slackin! He is referring to Crank Position. You're referring to Throttle Position. I'm just happy to catch you slippin'.

Jason. Is it a genuine sensor or at least a better brand name?? I believe I would replace that section of the loom, or make sure the PINs are clean and clear. I know some people have issues with breakup at higher RPM and people run a 10k resistor, but that is mostly people running stand alone, so I would avoid that.

Either way, in this order
1 Check PIN condition
2 Replace offending wires in loom

Yeah, I tried my old sensor that worked before and it’s the same output. Well I am running stand-alone but since It wasn’t running anymore I’m trying the stock ecu just to get spark. I’m thinking I’m just going to have to replace the harness which sucks but oh well, I’m not sure what else it could be

[jeffnhiscars]

It's also VERY common to reverse the CPS and reference sensor since the connectors are the same.

[aguiarjason]

It's also VERY common to reverse the CPS and reference sensor since the connectors are the same.

Reference sensor as in the one attached to the spark plug wire right? I’ve never used that it’s always been cut out. I could see people doing it though they’re right beside eachother

[jeffnhiscars]

Reference sensor as in the one attached to the spark plug wire right? I’ve never used that it’s always been cut out. I could see people doing it though they’re right beside eachother

If the connector is still there the cps could still be in the wrong spot