Table 1-63 (Continued) 83 S/N Operation Test Results Actions 5 Turn the ignition switch to ON. Connect an adapter between the ECU and the harness. Check the voltage of the pin J1-24 (signal output end of the throttle position sensor), J1-05 (grounding end), J1-20 (as the power supply for 4.5-5V sensor). Is it OK? Yes Next step No Repair or replace harness 6 Run the engine at an idle speed. Check if the ignition advance angle is normal after the coolant reaches normal operation. Yes Next step No Adjust ignition advance angle 7 Connect the fuel pressure gauge valve. 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 between 250 kPa and 300kPa. Yes Next step No 11 8 Connect the battery and the fuel injector with a special connector. With the voltage supply of 12V, check the fuel injector for normal operation. No 10 No Next step 9 Wash the fuel injector and check the fuel injector again for normal operation. Yes Next step No Replace fuel injector 10 Check if the fuel is wrong or contains water. Yes Replace fuel No 16 11 Check if the fuel pressure is lower than 250kPa. Yes Next step No 15 12 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 14 13 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 14 Check the fuel intake pipe for leakage or blockage. Yes Repair or replace fuel intake pipe No Replace fuel pump 15 Check if the fuel return pipe is blocked or bent. Yes Repair or replace fuel return pipe No Replace pressure regulator 16 Check if the exhaust system is blocked. Yes Replace or clean up No Replace ECU