Daewoo CIELO EURO III, Manual

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1F – 250 ENGINE CONTROLS
DAEWOO T-154 BL2,3
TAA1F380
DIAGNOSTIC TROUBLE CODE (DTC) P0327
KNOCK SENSOR CIRCUIT FAULT
System Description
The Knock Sensor (KS) system is used to detect engine
detonation, allowing the
engine control module (ECM) to retard ignition
control spark timing based on the KS signal being re-
ceived. The KS produces an A/C signal so that under a
no knock condition the signal on the KS circuit measures
about 0.007 volts A/C. The KS signal’s amplitude and
frequency depend upon the amount of knock being ex-
perienced. The ECM monitors the KS signal and
can diagnose the KS sensor and circuitry.
Conditions for Setting the DTC
1.5L SOHC
Average reading is less than 1% or greater than 80%
for any of the 4 cyliner.
Vacoom is less than 10 to 50 kPa based on rpm.
RPM is greater than 1600.
The coolant temperature is greater than 50
q
C
(122
q
F).
Action Taken When the DTC Sets
The MIL will illuminate after three consecutive trip
with fail (1.5L SOHC).
The ECM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Freeze Frame and Failure Records buff-
ers.
A history Diagnostic Trouble Code (DTC) is stored.
The ECM will use a calculated spark retard val-
ue to minimize knock during conditions when knock is
likely to occur. The calculated value will vary based
on engine speed and load.
Conditions for Clearing the MIL/DTC
The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault
within the freeze frame conditions that the DTC failed
(1.5L SOHC).
A history DTC will clear after 40 consecutive warm up
cycles without a fault.
DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
Check and correct any abnormal engine noise before
using the diagnostic table.
Any circuitry, that is suspected as causing the com-
plaint, should be thoroughly checked for the following
conditions:
Backed-out terminals
Improper mating
Broken locks
Improperly formed
Damaged terminals