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DTC P0172 FUEL INJECTION SYSTEM FUNCTION (M/T MODELS) EC-299 [QG (WITH EURO-OBD)] C D E F G H I J K L M A EC Diagnostic Procedure EBS00QLY 1. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (Manifold). OK or NG OK >> GO TO 2. NG >> Repair or replace. 2. CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK or NG OK >> GO TO 3. NG >> Repair or replace. 3. CHECK HEATED OXYGEN SENSOR 1 CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch “OFF”. 2. Disconnect heated oxygen sensor 1 (HO2S1) harness connec- 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 35 and HO2S1 5. Check harness continuity between ECM terminals 35 or HO2S1 6. Also check harness for short to power. OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK FUEL PRESSURE 1. Release fuel pressure to zero. Refer to EC-52, "FUEL PRESSURE RELEASE" . 2. Install fuel pressure gauge and check fuel pressure. Refer to . OK or NG OK >> GO TO 5. NG >> Follow the construction of “FUEL PRESSURE CHECK”. SEC502D Continuity should exist. Continuity should not exist. MBIB0091E At idling: 350 kPa (3.5 bar, 3.57 kg/cm2, 51 psi) |