LDP has detected a pinched hose in the evaporative hose system. Disclaimer. Check engine light (CEL) shining nice and bright. Check Light Comes on Soon. For about two months it ran well, but then the engine light began to come on and after that, it began to be very difficult to start. Low power, engine derated, or engine stops. The PCM (Powertrain Control Module) is a computerized system that monitors and controls various systems on a Jeep Cherokee, including vital operations such as engine timing, the transmission (gear shifting), anti-lock braking, fuel to air ratio mixing and quite a few others. But its still not too expensive when you consider everything else that could go wrong with your car. NAXJA Forum User. How to display the codes: Turn the ignition key On - Off - On - Off - On within 5 seconds . Was MIL code 37. When I had it checked it showed a faulty TPS sensor. It WARNING! verify it, including mechanics at the Jeep dealership. I did not believe it at first but it worked for me. Im here in SOCAL and I bought a 92 YJ with the 4.0L injected motor with the 5 speed manual trans. The throttle angle info the throttle position sensor (TPS) provides is key to engine performance. // --> a field fix that MIGHT help you get back home. The truck has 4.0L 4x4 cruise, tilt wheel, and airbags. num += Math.floor(Math.random()*355); Incorrect input state detected in the brake switch circuit. Hmm, I could definitely see the TGV assembly causing the issues youre experiencing if the TGVs were stuck closed. //-->,