|
|
P0172 FUEL INJECTION SYSTEM FUNCTION ECM-237 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O YES >> Repair or replace malfunctioning part. NO >> GO TO 2. 2. CHECK FOR INTAKE AIR LEAKAGE 1. Listen for an intake air leakage after the mass air flow sensor. 2. Check PCV hose connection. Is intake air leakage detected? YES >> Repair or replace malfunctioning part. NO >> GO TO 3. 3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect corresponding A/F sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. 5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector 6. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace malfunctioning part. 4. CHECK FUEL PRESSURE 1. Install all removed parts. 2. Release fuel pressure to 0. Refer to 3. Set a fuel pressure meter and check fuel pressure. Refer to Is the inspection result normal? YES >> GO TO 5. NO >> Replace malfunctioning fuel gauge unit. Refer to . 5. CHECK MASS AIR FLOW SENSOR WITH CONSULT + − Continuity A/F sensor 1 ECM Connector Terminal Connector Terminal F74 1 F16 64 Existed 2 72 + Ground Continuity A/F sensor 1 Connector Terminal F74 1 Ground Not existed 2 + Ground Continuity ECM Connector Terminal F16 64 Ground Not existed 72 At idle: 500 kPa (5.0 bar, 5.1 kg/cm 2 , 73 psi) |