Engine Electrical System

15) Poor and weak performance during acceleration
Yes Repair
1
Verify that there are any malfunctions such
as slipping of clutch, low pressure of tires,
delay in braking, and wrong size of tires or
inaccurate four-wheel alignment.
No Proceed to next step.
Yes Proceed to next step.
2 Verify that the throttle can be fully opened.
No
Replace or repair the
throttle
Yes
Fix the indicated
malfunction
3
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.
4
Run the engine at idle speed until the
coolant temperature reaches its normal
range in order to verify that the ignition
advance angle is normal.
No Inspect other items.
Yes Proceed to next step.
5
Turn the ignition switch to “ON” position
and connect the adaptor between ECU and
the wiring harness. Verify that the voltages
at following pins of ECU including absolute
pressure sensor of air intake manifold,
throttle valve position sensor, air intake
temperature sensor, coolant temperature
sensor, oxygen grounding terminal and
signal output terminal, sensor signal
grounding terminal and pins of 32# and 33#
(used as sensor power supply of 4.5-5V) are
normal.
No
Repair or replace the
wiring harness.
Yes Proceed to next step.
6
Verify that the air intake pressure is being
maintained between 35-65 kPa at idle speed.
No Overhaul
Yes Proceed to next step.
7
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 being maintained at
about 350kPa.
No Proceed to Step 11.
Yes Proceed to Step 10.
8
Apply a voltage supply of 12V directly
between the battery and the fuel injector
with special connector and verify that the
fuel injector functions normally.
No Proceed to next step.
Yes Proceed to next step.
9
After washing and cleaning the fuel injector,
verify again that it can function normally.
No
Replace the fuel
injector.
10 Verify that the fuel is deteriorated or Yes Replace the fuel.
E-86
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