Can someone help me make sense of this?
I’m troubleshooting a P2074 on my 2005 TJ with an NGC3 PCM. I’ve been logging the TPS through both an OBD scanner and HP Tuners, and here’s what I’m seeing:
At closed throttle, I’m getting ~0.6V, which is fine.
At wide open throttle (WOT), I’m only seeing about 2.6V.
This 2.7V reading is consistent across all methods: OBD scanner, HP Tuners, and directly with a multimeter — regardless of whether I ground to the connector, battery, or engine.
The 5V reference is solid, so that’s not the issue.
Now here’s the odd part:
With the TPS removed and manually rotated, it can output up to 4.7V — but only when turned beyond the ~90° mark (about a quarter turn), which is beyond the actual mechanical stop of the throttle body.
So unless I physically modify the throttle body cam to let the blade open past 90°, I’ll never reach that 4.7V in normal operation.
I’ve tried three different sensors:
The one that came with the Jeep (generic)
A brand-new NTK
A genuine Mopar unit from the dealer (fresh today)
All behave the same — ~0.6V closed, ~2.7V at mechanical WOT, ~4.7V only when rotated past 90°.
So… what am I missing here?
Is this normal for NGC3 TJ PCMs? What voltage do your TPS sensors output at WOT?
Is the tab that goes into the TPS at the end of your throttle shaft 90 degrees to horizontal or is at at an angle creating pre load when you fit it?
Appreciate any insight.
I’m troubleshooting a P2074 on my 2005 TJ with an NGC3 PCM. I’ve been logging the TPS through both an OBD scanner and HP Tuners, and here’s what I’m seeing:
At closed throttle, I’m getting ~0.6V, which is fine.
At wide open throttle (WOT), I’m only seeing about 2.6V.
This 2.7V reading is consistent across all methods: OBD scanner, HP Tuners, and directly with a multimeter — regardless of whether I ground to the connector, battery, or engine.
The 5V reference is solid, so that’s not the issue.
Now here’s the odd part:
With the TPS removed and manually rotated, it can output up to 4.7V — but only when turned beyond the ~90° mark (about a quarter turn), which is beyond the actual mechanical stop of the throttle body.
So unless I physically modify the throttle body cam to let the blade open past 90°, I’ll never reach that 4.7V in normal operation.
I’ve tried three different sensors:
The one that came with the Jeep (generic)
A brand-new NTK
A genuine Mopar unit from the dealer (fresh today)
All behave the same — ~0.6V closed, ~2.7V at mechanical WOT, ~4.7V only when rotated past 90°.
So… what am I missing here?
Is this normal for NGC3 TJ PCMs? What voltage do your TPS sensors output at WOT?
Is the tab that goes into the TPS at the end of your throttle shaft 90 degrees to horizontal or is at at an angle creating pre load when you fit it?
Appreciate any insight.
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