bradleyheathhays
Member
Hey folks. I've been drilling down on possible causes for my recent hard start and weird idle issues on the old 96er ('96 4.0 Cherokee), and it seems like I'm finally getting some traction. After replacing my throttle position sensor with OEM and cleaning my idle air control valve I'm still having issues, so I hooked up the old OBD reader (even though no CEL is on) and lo and behold I've got 3 codes. Wish I knew this earlier...
P0505 - IAC system malfunction
P0123 - TPS high voltage
P0118 - engine coolant temp high voltage
The chatgpt says all 3 are probably due to a shared electrical issue or sensor reference problem (whatever that is) as opposed to 3 different causes.
It ranks the most likely causes as...
1) bad sensor ground
2) short to voltage on the 5v reference line
3) wiring harness damage near throttle body
I can unwrap and check all the wiring harnesses for wear damage or inline shorts, but I'm not too sure about checking the ground connections at the engine and firewall as chatbot suggests.
Where do I find these connections please? All advice appreciated.
P0505 - IAC system malfunction
P0123 - TPS high voltage
P0118 - engine coolant temp high voltage
The chatgpt says all 3 are probably due to a shared electrical issue or sensor reference problem (whatever that is) as opposed to 3 different causes.
It ranks the most likely causes as...
1) bad sensor ground
2) short to voltage on the 5v reference line
3) wiring harness damage near throttle body
I can unwrap and check all the wiring harnesses for wear damage or inline shorts, but I'm not too sure about checking the ground connections at the engine and firewall as chatbot suggests.
Where do I find these connections please? All advice appreciated.
