Check engine light came on with DTC P0183 in my 2005 sonata GL, I followed service diagnosis procedure, disconnect M78, measure FTS resistance as 2.8 kohm at 70 F; Ignition on & engine off, measure voltage at pin 1 of M78 as 4.75 V (spec: 5V); Ignition off, measure resistance between pin 1 of M78 and pin 11 of PCM connector C44-2 as 5 ohm ( 3 ohm of wire extending pin 1 of M78 to front ); Measure resistance between pin 2 of M78 and chassis ground as 0 ohm.

It seems that FTS is good and no problem with harness, I sprayed electric cleaner in M78. would it be the problem of PCM?