Table 1-54 (Continued 1)
S/N Operation Test Results Actions
Yes Next step
5
Connect the fuel pressure gauge valve. Short-circuit
the pin 30 and the pin 87 of the fuel bump relay, and
run the fuel pump. Check if the fuel pressure is about
300kPa.
No 9
Yes 8
6
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 Next step
Yes Next step
7
Wash the fuel injector and check the fuel injector
again for normal operation.
No Replace fuel injector
Yes Replace fuel
8
Replace the fuel. Check if the fuel is wrong or
contains water.
No 14
Yes Next step
9
250kPa Check if the fuel pressure is lower than
250kPa.
No 13
Yes Next step
10
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 12
Yes
Replace fuel pressure
regulator
11
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 intake
pipe
12 Check the fuel intake pipe for leakage or blockage.
No Replace fuel pump
Yes
Repair or replace fuel return
pipe
Repair or replace fuel return
pipe
13 Check if the fuel return pipe is blocked or bent.
No
Replace fuel pressure
regulator
Yes Next step
14
Before the engine coolant reaches 35°C, take out the
idle speed actuator connector, and check if the
rotation speed of the engine is decreased.
No Replace idle speed actuator
Yes Next step
15
Turn the ignition switch to ON. Check the voltage of
the following pins of the ECU. Is the voltage of the pin
J1-12 (crankshaft position sensor) is about 12V? Is
the empty pin and the pin J1-54 (idle speed stepper
motor A+) is 0V?
No Check harness and interface
Yes Next step
16
Keep the engine at idle speed. After the coolant
reaches normal temperature, ground the pin 51 of the
ECU with a short-connected line. Check if the ignition
advance angle is a 6.75° crank angle.
No
Adjust ignition advance
angle
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