Engine Electrical System

5) Difficult start-up of cold 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 verify that there is any
malfunction information record.
No Proceed to next step.
Yes Proceed to next step.
2
Inspect with multimeter to see
whether the coolant temperature
sensor is normal. (Or connect a
1.5KΩ resistance in series with
ECU’s pin of 39# and 35# to replace
the function of the coolant
temperature sensor to start up the
engine. If the engine can be started, it
indicates that the coolant temperature
sensor is abnormal.)
No Replace the sensor
Yes Proceed to next step.
3
Turn the ignition switch to “ON”
position and connect the adaptor
between ECU and the wiring harness.
Verify that the voltages at following
ECU pins are normal: 13# is at about
12V of battery voltage; 80# and 61#
are at zero.
No
Inspect the wiring harness
and plug in connector
Yes Proceed to next step.
4
Verify that the air filter is free of any
blockage.
No Replace
Yes Proceed to next step.
5
After start up, verify that the air
intake manifold pressure is
maintained between 35-65 kPa at idle
speed.
No
Fix the leakage of air
intake system.
Yes
Inspect the throttle valve
and idle speed passage. 6
Step on the throttle gently to verify
that it is easy to be started up.
No Proceed to next step.
Yes Proceed to next step.
7
Disconnect the connector of idle
speed actuator before the temperature
of engine coolant reaches 35℃ in
order to observe whether the engine
speed is decreasing.
No
Repair or replace the idle
speed actuator
8
Connect the fuel manometer valve
(the connecting point will depend on
Yes Proceed to next step.
E-70
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