Table 1-56 (Continued)
S/N Operation Test Results Actions
Yes Replace fuel
12 Check if the fuel is wrong or contains water.
No 18
Yes Next step
13 Check if the fuel pressure is lower than 380kPa.
No 17
Yes Next step
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.
No 16
Yes
Replace fuel pressure
regulator
15
Turn on the fuel gauge valve, and block the fuel return
pipe. Check if the fuel pressure is quickly produced.
No
Repair or replace fuel
injector or fuel pipe
Yes
Repair or replace fuel return
pipe
16 Check the fuel intake pipe for leakage or blockage.
No Replace fuel pump
Yes
Repair or replace fuel return
pipe
17 Check if the fuel return pipe is blocked or bent.
No
Replace fuel pressure
regulator
Yes Clean up
18
Check if the sense hole of the intake air manifold
pressure and temperature sensor is blocked.
No Next step
Yes 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.
No
Check oxygen sensor and
harness
Yes Repair the leakage
20 Check the intake air system of the engine for leakage.
No Next step
Yes Next step
21 Check if the cylinder pressure of the engine is normal.
No Remove the trouble
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