Table 1-52 (Continued) 3. Hard to start after warm-up Table 1-53 69 S/N Operation Test Results Actions 15 Check the fuel intake pipe for leakage or blockage. Yes Replace or repair fuel intake pipe No Replace fuel pump 16 Check if the fuel return pipe is blocked or bent. Yes Repair or replace fuel return pipe No Replace fuel pressure regulator 17 Connect an adapter between the ECU and the harness. Check the pin J1-73 of the ECU for voltage. Check the positive power supply line of the above-mentioned ECU pin and the groud wire of the pin J1-01, J1-17, J1-18 connected to the ECU for normal operation.
Yes Next step No Repair or replace harness 18 Check the parts and components of the intake system for leakage. Yes Repair No Next step 19 Check if the intake manifold absolute pressure and temperature sensor is blocked. Yes Repair or replace No Next step 20 Check if the coolant temperature sensor for normal operation. Yes Next step No Repair or replace 21 Check if the gap between the piston and the cylinder is too wide. Check the cylinder for leakage. Yes Remove mechanical trouble No Replace ECU S/N Operation Test Results Actions 1 Turn the ignition switch to ON. Check if there is trouble information records with a diagnostic instrument.
Yes Remove the trouble No Next step 2 Connect the fuel pressure gauge valve (the connection point is related to the vehicle model). Short-circuit the pin J1-47 and the pin J1-73 of the fuel bump relay, and run the fuel pump. Check if the fuel pressure is about 300kPa. Yes Next step No 9 3 Disconnect the fuel pipe, and turn the ignition switch. Check if the pressure of the fuel system still keeps between 150kPa and 200kPa after 1 hour. Yes Next step No Repair fuel system leakage 4 Connect the fuel pipe. Block the fuel return pipe, and turn off the fuel pressure gauge valve. Turn off the ignition switch.
Check if the pressure of the fuel system still keeps between 150kPa and 200kPa after 1 hour. Yes Replace fuel pressure regulator (inbuilt) No Next step