Table 1-56 (Continued) 75 S/N Operation Test Results Actions 12 Check if the fuel is wrong or contains water. Yes Replace fuel No 18 13 Check if the fuel pressure is lower than 380kPa. Yes Next step No 17 14 Close the fuel gauge valve. Turn on the ignition switch again and keep the fuel pump working for 3 seconds. Check if fuel pressure can be produced. Yes Next step No 16 15 Turn on the fuel gauge valve, and block the fuel return pipe. Check if the fuel pressure is quickly produced. Yes Replace fuel pressure regulator No Repair or replace fuel injector or fuel pipe 16 Check the fuel intake pipe for leakage or blockage.
Yes Repair or replace fuel return pipe No Replace fuel pump 17 Check if the fuel return pipe is blocked or bent. Yes Repair or replace fuel return pipe No Replace fuel pressure regulator 18 Check if the sense hole of the intake air manifold pressure and temperature sensor is blocked. Yes Clean up No Next step 19 Run the engine at an idle speed. After the coolant reaches the temperature activated by the closed loop control, check the oxygen sensor for normal operation. Yes Next step No Check oxygen sensor and harness 20 Check the intake air system of the engine for leakage. Yes Repair the leakage No Next step 21 Check if the cylinder pressure of the engine is normal.
Yes Next step No Remove the trouble