DTC P0125: Excessive Time To Enter Closed Loop Fuel Control (3.0L With CALIFORNIA Emissions)
NOTE:
For terminal identification, see TERMINAL IDENTIFICATION . For circuit and wire color identification, see WIRING DIAGRAMS
article.
- Check both front Heated Oxygen Sensors (HO2Ss). For 2.4L engines, go to DTC P0130: FRONT HEATED OXYGEN SENSOR (HO2S) CIRCUIT MALFUNCTION (2.4L) . For 3.0L engines, go to DTC P0130: FRONT HEATED OXYGEN SENSOR (HO2S) CIRCUIT MALFUNCTION (3.0L) . On all models, also go to DTC P0150: LEFT FRONT HEATED OXYGEN SENSOR (HO2S) CIRCUIT MALFUNCTION test. Replace front HO2S(s) if necessary. Go to step 11). If front HO2Ss are okay, go to next step.
- Inspect wiring harness between right front HO2S and PCM. Repair wiring harness as necessary. Go to step 11). If wiring harness is okay, go to next step.
- Inspect right front HO2S and PCM connectors for damage. Repair or replace connectors as necessary. Go to step 11). If connectors are okay, go to next step.
- Inspect wiring harness between left front HO2S and PCM. Repair wiring harness as necessary. Go to step 11). If wiring harness is okay, go to next step.
- Inspect left front HO2S and PCM connectors for damage. Repair or replace connectors as necessary. Go to step 11). If connectors are okay, go to next step.
- Ensure engine coolant temperature is at 68°F (20°C). Disconnect each fuel injector connector. Using DVOM, check resistance across fuel injector terminals. If resistance is not 13-16 ohms replace fuel injector(s). Go to step 11). If resistance is as specified, go to next step.
- Inspect wiring harness between each fuel injector and PCM. Repair wiring harness as necessary. Go to step 11). If wiring harness is okay, go to next step.
- Inspect each fuel injector and PCM connector for damage. Repair or replace connectors as necessary. Go to step 11). If connectors are okay, go to next step.
- Check fuel pressure. See FUEL PRESSURE under FUEL SYSTEM in BASIC TESTING article. Repair fuel system as necessary. Go to step 11). If fuel pressure is okay, go to next step.
- Inspect following items:
- Check intake system for vacuum leak.
- Check exhaust system for leaks at HO2S, exhaust manifold, front pipe etc.
- Check fuel filter and fuel line for clogging.
- Check fuel pump performance. See FUEL PUMP PERFORMANCE table under FUEL SYSTEM in BASIC TESTING article.
Repair or replace item(s) as necessary. Go to next step. If no faults are found, replace PCM. Go to next step.
- Road test vehicle and attempt to duplicate conditions that caused original complaint. Recheck for DTCs. If no DTCs are displayed, test is complete.