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CPS and Spark Question. Crank, no start, no spark.
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Ah OK. I would pull the inspection cover off the trans and check the flex plate as well. Make sure the "ring" (part that gets close to the CPS is OK).
The CPS test is completely independent of any other issue since it's disconnected from everything else. It only needs the ring on the Flex plate to pass close enough to induce the voltage. When the gap passes, the mag field collapses If you're getting Zero volts A/C disconnected with the engine cranking, that can only mean if the sensor is bad, or the gap is too large.
If you can crank the engine (which you can), the solenoid is OK. You can check the fusible links which feed power to the rest of the vehicle.
Thank you! Looks like I'm going to take off the plastic tab around the CPS just to see if that'll get me closer to the flywheel. I'm hoping that does it but I'm not optimistic. I'll also open the inspection cover and make sure the flex plate is fine.
Fusible links and wiring to the starter relay look good. However, I wasn't getting any voltage in the green wire to the starter relay with the key on (not cranking) and I was expecting there to be some voltage going into the relay.
Oh and I might as well clean the starter relay in case there's a bad contact there as well.
Yep, mine looked like that after a bad jacking to change motor mounts. New style is different and uses a different connector.
PN is 3300 2933.
In stock at Rockauto.
Ordered and will install soon.
Going back to CPS because I've been thinking about it all day. The CPS that was installed in the car wasn't offset those 5 degrees. I did find an NGK part that is offset 5 degrees. Now, I haven't ordered an NGK part yet, I've read those are the best. The ones I've tried are the NAPA ones and OReilly. As mentioned before, every CPS I've tried gives me 0 volts on crank.
What's your opinion on this? Should I try the 5 degree offset one? Should I slot the current CPS further so that I may get it even closer to the fly wheel? I've also read that the CPS for pre 1990 are different than for 1991 onwards. Is that true?
I did notice that the CPS bracket has 2 screw holes on the bell housing on the left and 1 on the right. Not sure if that makes sense but it's like it's an option to offset it yourself?
I did take the plastic cover I mentioned before and I still get 0 volts.
... getting ~3.4v on both sides of the CPS connector. Then I'm seeing 10.5 volts for the TPS. This is when just turning the key so I can get the reference volts which I think on the 87 should be 5 volts. Do you think it's the ECU?
Originally Posted by datoro21
I'm pretty much getting 12 volts on all sensors when just the key is in.
Originally Posted by datoro21
every CPS I've tried gives me 0 volts on crank
This seems confusing to me but yes CPS should have 5.0 volts. IIWM I'd test at the ECU to make sure the sensors are getting proper voltage. Specifically at C connector look at 1, 14, 15, 16:
I would also try testing CPS signal on DC scale turning engine over slowly with KO (CPS signal is actually a DC signal. I think using AC setting is a workaround to try to measure the ~1800 pulses/minute during cranking. You could also use a DVA. You could also get a new Cherokee for $40K.).
This seems confusing to me but yes CPS should have 5.0 volts. IIWM I'd test at the ECU to make sure the sensors are getting proper voltage. Specifically at C connector look at 1, 14, 15, 16:
I would also try testing CPS signal on DC scale turning engine over slowly with KO (CPS signal is actually a DC signal. I think using AC setting is a workaround to try to measure the ~1800 pulses/minute during cranking. You could also use a DVA. You could also get a new Cherokee for $40K.).
Lol at getting a new one for 40k 😂
I'm having a mechanic come by on wednesday to diagnose. I'm at my wits end.
