Odd P0123 Problem - JeepForum.com
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post #1 of 10 Old 09-27-2019, 05:41 PM Thread Starter
tneary
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Odd P0123 Problem

Hi Guys,

Need some help. I have a 99 Sahara

So I replaced the Leak Detection Pump and things were fine. Drove 50 miles all good...Then the Small Evap Leak code (P0465)....Read somewhere to check Fuse 11. When I did Fuse 11 was blown. So I replaced Fuse 11. As soon as I did I started getting P0123 TPS code.

I went to clear the code but immediately after the scanner clears the code CEL come back on for P0123.

If I pull Fuse 11 then the code clears and does not come back on.

Tested the TPS...(with Fuse 11 in and out) ...tested the same both times. Resistance was good. 5v supply was good. The wiper signal voltage went smoothly thru the range up thru ~4.1v. The one problem I see is this
- With Fuse 11 removed the idle signal voltage was .8v
- With Fuse 11 inserted the idle signal voltage was 1.1v which appears to trigger the P0123 code

Wonder if the TPS is really the problem. Just hate to spend $75 for a new Mopar TPS to find out its something else.

Anybody come across something similar ?

Thoughts?

Thanks in Advance.
Tom

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post #2 of 10 Old 09-27-2019, 09:01 PM
mukluk
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The only thing I'm seeing at the moment that the fuse 11 F12 feed circuit and the TPS circuit have in common is they both pass through connector C103 -- circuit F12 at pin 9 going to the torque converter clutch solenoid connector, and the TPS K167 sensor ground/return at pin 8. I'd unplug and take a look at C103 to see if there's any crud possibly shorting the pins to each other; C103 is the black connector near the top center of the firewall as seen in the attachments below.
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post #3 of 10 Old 09-28-2019, 08:05 AM
jtec
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trying to follow along - fuse 11 ? we are talking JB in cab fuses??

ANYTHING electrical added to jeep ?? lights, audio? amp,
Is the airbag light on?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 10 Old 09-29-2019, 08:35 PM Thread Starter
tneary
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Thanks. Fuse #11 in the glove box.

Nothing added that would have cut into the wiring harness. Fog lights replaced a year or so back.
Airbag light is not on.
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post #5 of 10 Old 09-30-2019, 07:55 AM
jtec
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monday I have a head ache (hangover) and electrical thinkiing needed - not abandoning interest in issue - will reply later.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 10 Old 10-07-2019, 06:36 AM Thread Starter
tneary
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I disconnected C103 and all looked good and clean.
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post #7 of 10 Old 10-07-2019, 07:19 AM
jjandascog
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Sounds like you really have two different issues.

The EVAP code might show back up when the conditions are correct for the Jeep to run the EVAP test, the two main conditions are that the fuel level be between 80% and 20% full and the engine temperature be cold.

2004 Jeep TJ Sport, 4.0, Auto, 3.5 SL, 1.25" BL, BFG's cool mud jack across the hood
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post #8 of 10 Old 10-07-2019, 10:22 PM Thread Starter
tneary
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Thanks. The EVAP issue I believe is resolved with the replacement of the small line running to the gas tank.
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post #9 of 10 Old 10-08-2019, 05:45 AM
jtec
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current issue is code for TPS when fuse installed?

You do have a scanner?
Only 1 code p0123?
What is TPS voltage with fuse out, then in? on scanner....
Did anyone ask about the airbag light?
Is there any voltage on ground circuit of TPS?
What is referance voltage fuse out and then in?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 10 Old 10-10-2019, 01:50 PM Thread Starter
tneary
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Quote:
Originally Posted by jtec View Post
current issue is code for TPS when fuse installed?

You do have a scanner? Yes
Only 1 code p0123? Yes
What is TPS voltage with fuse out, then in? on scanner.... Measuring Voltage on the TPS .8v with fuse out and 1.1v with fuse in
Did anyone ask about the airbag light? No airbag light. And I also disconnected the wiring to the clock spring
Is there any voltage on ground circuit of TPS? will double check
What is referance voltage fuse out and then in?
will double check
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