Here are the description and diagnostic procedures.
DTC P0125 : EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL
DTC Set Criteria
" At least 2 seconds have passed since engine started. Engine coolant temperature is more than 176 F (80 C). Engine speed is 1800 -3500 RPM. Volumetric efficiency is 16 -62 percent. Code will set if system does not enter closed loop control within 30 seconds of engine entering air/fuel mixture ratio feedback zone. Monitor is run only once per drive
" Heated Oxygen Sensor (HO2S) failed.
" Injector failed.
" Fuel pressure regulator failed.
" Fuel pump failed.
" Fuel filter clogged.
" Air intake system leak.
" Exhaust system leak.
" Engine Control Module/Powertrain Control Module (ECM/PCM) failed.
1. Check front Heated Oxygen Sensor (HO2S).
Replace as necessary, and go to step 7. If front HO2S is okay, go to next step.
2. Check 4 -pin front HO2S connector and ECM 22-pin connector, or PCM 26 -pin connector. Also, check wiring harness between front HO2S and ECM/PCM. Repair as necessary, and go to step 7. If wiring and connectors are okay, Go to next step.
3. Using stethoscope, or long-blade screwdriver, listen for operating sounds of injector during idling or cranking. Turn ignition off. Remove each injector connector and check resistance between injector terminals. At 68 F (20 C), resistance should be 2 -3 ohms on 2.0L turbo and 13 - 16 ohms on 2.4L. Replace injectors as necessary. If injectors are okay, go to next step.
4. Check wiring harness between injectors and ECM/PCM. Also, check injector connector and ECM/PCM connectors. Repair as necessary, and go to step 7. If wiring and connectors are okay, go to next step.
5. Perform fuel pressure test. Repair as necessary. If fuel pressure is okay, go to next step.
6. Check for air being drawn into air intake or exhaust system. Check for exhaust leaks at HO2S fittings, exhaust manifold or front pipes. Check for fuel filter and/or fuel line clogging. Check fuel pump for poor fuel delivery. Repair as necessary, and go to next step. If these items are okay, replace ECM/PCM, and go to next step.
7. Test drive vehicle following OBD -II drive cycle other monitor pattern. Check scan tool for DTCs. Confirm DTC does not reset.
Friday, September 11th, 2009 AT 10:07 AM