• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.
• | DTCs P0030, P0031, P0032, P0053, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P0140, P2232, P2243, P2251, P2270, P2271, P2297, P2626 are not set. |
• | The engine speed is between 1,200-2,900 RPM. |
• | The engine load is between 16-21 percent. |
• | The engine is in Closed Loop for 3 seconds. |
• | The DTC runs continuously when the above conditions are met for 1 second. |
• | DTCs P0010, P0011, P0013, P0014, P0030, P0031, P0032, P0053, P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0135, P0335, P0336, P0338, P0443, P0455, P0458, P0459, P0496, P2088, P2089, P2090, P2091, P2096, P2097, P2176, P2195, P2196, P2243, P2251, P2297, P2626 are not set. |
• | The engine is running. |
• | The engine is in Closed Loop for greater than 1 minute. |
• | The engine coolant temperature is warmer than 60°C (140°F). |
• | The intake air temperature is equal to or colder than 60°C (140°F). |
• | The commanded lambda is greater than 0.83. |
• | The deceleration fuel cut-off (DFCO) is not active. |
• | The fuel level is greater than 10 percent. |
• | The mass air flow is equal to or between 6.9-41.7 g/s. |
• | The engine load is equal to or between 18-80 percent. |
• | The engine speed is equal to or between 1,200-4,000 RPM. |
• | The throttle angle is equal to or less than 99.6 percent. |
• | The DTC runs continuously when the above conditions have been met for 1 second. |
• | DTCs P0010, P0011, P0013, P0014, P0030, P0031, P0032, P0053, P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0135, P0335, P0336, P0338, P0443, P0455, P0458, P0459, P0496, P2088, P2089, P2090, P2091, P2096, P2097, P2176, P2195, P2196, P2243, P2251, P2297, P2626 are not set. |
• | The engine is running. |
• | The engine is in Closed Loop. |
• | The engine coolant temperature is warmer than 60°C (140°F). |
• | The intake air temperature is equal to or colder than 60°C (140°F). |
• | The commanded lambda is greater than 0.83. |
• | The deceleration fuel cut-off (DFCO) is not active. |
• | The fuel level is greater than 10 percent. |
• | The mass air flow is equal to or between 1.7- 7.8 g/s. |
• | The engine load is equal to or between 11-45 percent. |
• | The engine speed is equal to or between 520-1,120 RPM. |
• | The DTC runs continuously when the above conditions have been met for 1 second. |
• | The post catalyst FT weighted average value is less than a calibrated value. |
• | The DTC sets when the above condition is met for 4 seconds continuously, or for 50 seconds cumulatively. |
• | The long term FT weighted average value is greater than a calibrated value at idle, cruise or during acceleration. |
• | The DTCs set when the above condition is met for 4 seconds continuously, or for 50 seconds cumulatively. |
DTCs P2096, P2177, and P2187 are Type B DTCs.
DTCs P2096, P2177, and P2187 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Important: Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.
⇒ | If the DTC sets this ignition, proceed with Circuit/System Testing. |
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Allow the engine to reach operating temperature. With the engine idling, observe the Long Term FT parameter with a scan tool. The reading should be between 0-20 percent.
⇒ | If not within the specified range, inspect for the following: |
• | With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure. |
⇒ | If the MAP sensor does not indicate the correct barometric pressure, refer to DTC P0106 or DTC P0107 or P0108. |
• | With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be between 2-6 g/s at idle. |
⇒ | If the MAF sensor parameter is not between 2-6 g/s at idle, refer to DTC P0100, P0102, or P0103 or DTC P0101. |
• | Vacuum hoses for splits, kinks, and improper connections |
• | Insufficient fuel in the tank |
• | Low fuel pressure--Refer to Fuel System Diagnosis. |
• | Ethanol concentration greater than 15 percent--Refer to Alcohol/Contaminants-in-Fuel Diagnosis. |
• | Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis. |
• | Malfunctioning fuel injectors |
• | Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust. |
• | Vacuum leaks at the intake manifold and the throttle body |
• | Vacuum leaks at the charge air bypass valve solenoid, the charge air bypass valve, and the charge air bypass valve vacuum tank |
• | The air induction system and the air intake ducts for leaks or for a missing air filter element |
• | A cracked EVAP canister |
• | Evaporative pipes obstructed or leaking |
• | The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis. |
• | The HO2S for improper installation and for electrical wires or connectors that may have suffered corrosion, water intrusion, or contacted the exhaust system |
• | Incorrect terminal tension at electrical connectors |
• | Loose, corroded, or mislocated electrical ground connections |
• | The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit |
• | Malfunctioning engine components--Refer to Symptoms - Engine Mechanical. |
Important: After repairs, use the scan tool Fuel Trim Reset function in order to reset the long term fuel trim.
Important: DO NOT clear codes with the engine running. The codes may reset in the same ignition cycle.