DTC Troubleshooting: P0171 (45), P0172 (45)
|DTC P0171:||Fuel System Too Lean|
NOTE: If some of the DTCs listed below are stored at the same time as DTC P0171 and/or P0172, troubleshoot those DTCs first, then recheck for P0171 and/or P0172.
P0068, P0106, P0107, P0108: Manifold absolute pressure (MAP) sensor
P0130, P0132, P0134: Primary HO2S sensor (Sensor 1)
P0135: Primary HO2S sensor (Sensor 1) heater
P0137, P0138, P0140: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271: Injector
P0401, P0403, P0404, P0405, P0406, P0409, P0489, P0490: Exhaust gas recalculation (EGR) system
P0444, P0445: EVAP canister purge valve
|1.||Check the following parts for vacuum leaks:|
Are they OK?
YES - Go to 2.
NO - Repair or replace parts for vacuum leaks, then go to 10.
|2.||Check the fuel pressure.|
Is the fuel pressure OK?
YES - Go to 3.
NO - Check these items:
|3.||Turn the ignition switch OFF.|
|4.||Disconnect the vacuum hose (A) and connect a vacuum gauge (B) to the hose.|
|5.||Apply vacuum to the EVAP canister purge valve (C).|
Does it hold vacuum?
YES - Go to 6.
NO - Replace the EVAP canister purge valve, then go to 10.
|6.||Turn the ignition switch ON (II).|
|7.||Check the MAP SENSOR in the DATA LIST with the HDS.|
Is atmospheric pressure indicated?
YES - Go to 8.
|8.||Start the engine.|
|9.||Check the MAP SENSOR in the DATA LIST with the HDS.|
Is about 46.6 kPa (350 mmHg, 13.7 in.Hg) indicated within 1 second after starting the engine?
|10.||Turn the ignition switch ON (II).|
|11.||Do the ECM RESET in the CLEAR MENU with the HDS.|
|12.||Do the ETCS learn procedure.|
|13.||Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle.|
|14.||Test-drive under following conditions.|
|15.||Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.|
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0171 or P0172 is indicated, go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Troubleshooting is complete.n