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Mar 26, 2015 | 04:59 PM

#46

soledad89xj

Junior Member

Joined: Feb 2015

Posts: 32

Likes: 1

From: US-MS

Year: 1989

Model: Cherokee

Engine: 4.0L I6 "Power Tech"

Quote:

Originally Posted by cruiser54

Did you bypass the C101 with the CPS wires?

Have you had any luck with this? Just curious haven't seen you report back on whether or not this changed anything...

Mar 26, 2015 | 05:25 PM

#47

matt0106

Thread Starter

Seasoned Member

Joined: Jul 2012

Posts: 312

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From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

I started it, haven't finished it yet.

Mar 26, 2015 | 06:25 PM

#48

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by matt0106

I started it, haven't finished it yet.

Well, the CPS signal runs through that. Finish it before getting off on any other rabbit trails.

Mar 26, 2015 | 06:26 PM

#49

matt0106

Thread Starter

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Joined: Jul 2012

Posts: 312

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From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

But why would finishing that be the first priority? The CPS not getting a good reading should be.

Mar 26, 2015 | 06:28 PM

#50

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by matt0106

But why would finishing that be the first priority? The CPS not getting a good reading should be.

Maybe because the CPS signal runs through the c101? Just sayin'.

Mar 26, 2015 | 06:35 PM

#51

matt0106

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Joined: Jul 2012

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From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

Ok, I get that. But if the CPS is only putting out .204 AC volts, then how is the voltage going to get any higher if a bypass the C101?

Mar 26, 2015 | 06:44 PM

#52

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by matt0106

Ok, I get that. But if the CPS is only putting out .204 AC volts, then how is the voltage going to get any higher if a bypass the C101?

It's not. But the signal from the CPS to the eCU will most likely improve.

Did you drill the Mopar CPS's upper mounting hole or was it done already?

Mar 26, 2015 | 06:46 PM

#53

matt0106

Thread Starter

Seasoned Member

Joined: Jul 2012

Posts: 312

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From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

Ok. I'll do it when I'm free next. I didn't want to drill it if I don't need to.

Mar 26, 2015 | 06:48 PM

#54

cruiser54

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Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by matt0106

Ok. I'll do it when I'm free next. I didn't want to drill it if I don't need to.

The Mopar CPSs used in the patch harness kit were slotted from the factory.

Mar 26, 2015 | 06:53 PM

#55

matt0106

Thread Starter

Seasoned Member

Joined: Jul 2012

Posts: 312

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From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

I didn't get the kit. I just got the CPS. The last two I got at NAPA I drilled and it didn't help at all.

Mar 26, 2015 | 07:30 PM

#56

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Little bit of a crap shoot.

Mar 26, 2015 | 07:31 PM

#57

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Quote:

Originally Posted by matt0106

OK, I'm stumped. I bought a new better quality meter and tested it and the highest reading I got from the CPS was .204 AC volts. How can I be getting a reading that low from a brand new Mopar CPS?

You are testing probing only the two wires to the unplugged CPS, correct?

I'm not sure how much it matters, but its cranking OK? "brisk"

Mar 26, 2015 | 07:58 PM

#58

matt0106

Thread Starter

Seasoned Member

Joined: Jul 2012

Posts: 312

Likes: 0

From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

Yeah, just the two wires from the CPS. And it's cranking kinda slow because I think my battery is shot. I gotta jump it to crank it.

Mar 27, 2015 | 05:01 PM

#59

matt0106

Thread Starter

Seasoned Member

Joined: Jul 2012

Posts: 312

Likes: 0

From: Little Elm, TX

Year: 1987

Model: Cherokee

Engine: Inline 6 cylinder

Ok, so let's say hypothetically that when I bypass the connector, it still won't start. Then what do I do? Start with the low CPS reading?

Mar 27, 2015 | 06:41 PM

#60

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by matt0106

Ok, so let's say hypothetically that when I bypass the connector, it still won't start. Then what do I do? Start with the low CPS reading?

Yep. TSB 18-51-88 shows the CPS with the slotted hole that came in their kit. It was important to them to slot the upper mounting hole and bypass the C101 to rectify the issue.

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