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DTC P0172 FUEL INJECTION SYSTEM FUNCTION EC-235 [KA24DE] C D E F G H I J K L M A EC Diagnostic Procedure UBS00D58 1. CHECK FOR 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 HEATED OXYGEN SENSOR 1 CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 1 harness connector and 3. Check harness continuity between ECM terminal 50 and HO2S1 4. Check harness continuity between ECM terminal 50 or HO2S1 5. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 3. CHECK FUEL PRESSURE 1. Release fuel pressure to zero. EC-46, "FUEL PRESSURE RELEASE" 2. Install fuel pressure gauge and check fuel pressure. OK or NG OK >> GO TO 5. NG >> GO TO 4. SEC502D Continuity should exist. Continuity should not exist. BBIA0430E At idling When fuel pressure regulator valve Approximately 235 kPa (2.4 kg/cm 2 , 34 psi) When fuel pressure regulator valve Approximately 294 kPa (3.0 kg/cm 2 , 43 psi) |