If improper ECTS(Engine Coolant Temperature Sensor) signal is sent to PCM, it could be the cause of delayed starting.
Connect a scantool to Data Link Connector(DLC).
IG "ON"
Select the current data function on the scantool.
Check if there is a big difference between "Coolant Temperature sensor" and "Intake Air Temperature sensor".
Specification : At initial starting, coolant temperature sensor is similar to intake air temperature sensor. (ECTS is not lower than IATS at warm condition.)
Is the ECTS data normal?
YES
ECTS is OK.
NO
Go to "Power circuit Inspection" procedure as below.
IG "OFF"
Disconnect the ECTS Connector.
IG "ON"
Measure the voltage between terminal "3" of the ECTS harness connector and chassis ground.
Probe(+) : Terminal "3" of the ECTS harness connector.
Probe(-) : Chassis ground
Specification : Approx. 5V
Is the measured voltage within Specification?
YES
Go to "Ground circuit Inspection" procedure as below.
NO
Faulty PCM
IG "OFF"
Disconnect the ECTS Connector.
Measure resistance between terminal "1" of the ECTS harness connector and chassis ground.
Probe(+) : Terminal "1" of the ECTS harness connector.
Probe(-) : Chassis ground
Specification : Below 0.5Ω
Is the measured voltage within Specification?
YES
Faulty ECTS
NO
Check for open between ECTS harness connector and PCM harness connector.
