Engine Electrical System

3) Difficult start-up of hot engine
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
Yes
Fix the indicated
malfunction
1
Turn the ignition switch to “ON” position.
Inspect with the diagnostic tester to see
whether there is any malfunction
information record.
No
Proceed to next
step.
Yes
Proceed to next
step.
2
Connect the fuel manometer valve. Short
the 30# and 87# pins of the fuel pump relay
to operate the fuel pump in order to verify
that the fuel pressure is maintained at about
350kPa.
No Proceed to Step 9.
Yes
Proceed to next
step.
3
Disconnect the connecting fuel pipe and
turn off the ignition switch. After 1 hour,
verify that the pressure of fuel system is
maintained between 250-300 kPa.
No
Repair the leakage
of fuel system
Yes
Replace the fuel
pressure regulator
4
Connect the connecting fuel pipe and block
the fuel return pipe with the fuel tube clamp
as well as close the fuel manometer valve.
Then turn off the ignition switch, after 1
hour, verify that the pressure of fuel system
is maintained between 250-300 kPa.
No
Proceed to next
step.
Yes
Replace the fuel
injector and fuel
pipe 5
Verify that the fuel injector and fuel pipe
have any fuel leakages.
No
Proceed to next
step.
Yes
Inspect the coolant
temperature and
circuit 6
Disconnect the connector of water
temperature sensor to start up the engine.
Observe whether it can successfully start up.
No
Proceed to next
step.
Yes
Proceed to next
step.
7
Put adaptor between ECU and wiring
harness. Then verify that there is any
voltage at the ECU’s 44#, 45#, 63#, 12# and
13# pins and to see whether the positive
power wires connected to the above ECU’s
pins and the ground wire connected to the
pins of 3#, 51#, 53#, 61# and 80# are
normal.
No
Repair or replace
the wiring harness
E-66
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