Daewoo CIELO EURO III Manual page 428

1F – 258 ENGINE CONTROLS
58X CRANKSHAFT POSITION (CKP) SENSOR TOOTH ERROR NOT LEARNED
System Description
In order to detect engine misfire at higher engine
speeds, the engine
control module (ECM) must know of any variation be-
tween the crankshaft sensor pulses. Most variations are
due to the machining of the crankshaft reluctor wheel.
However, other sources of variation are also possible. A
Crankshaft Position (CKP) system variation learning
procedure must be performed any time a change is
made to the crankshaft sensor to crankshaft relationship
of if the ECM is replaced or reprogrammed. The
ECM measures the variations and then calculates
compensation factors needed to enable the ECM
to accurately detect engine misfire at all speeds and
loads. A scan tool must be used to command the
ECM to learn these variations. If for any reason the
ECM is unable to learn these variations or they are
out of an acceptable range, the ECM will set a
DTC P1336. A ECM that has not had the CKP sys-
tem variation learning procedure performed due to re-
placement or reprogramming will also set a DTC P1336.
Conditions for Setting the DTC
1.5L SOHC
DTCs P0106, P0107, P0108, P0117, P0118, P0122,
P0123, P0132, P0201, P0202, P0203, P0204,
P0336, P0337, P0341, P0342, P0351, P0352,
P0402, P1404, P0405, P0406, and P0502 are not
set.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate.
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-
er.
A history DTC is stored.
Conditions for Clearing the MIL/DTC
The MIL will turn OFF after three (four –
1.5L SOHC) consecutive ignition cycles in which the
diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm up
cycles without a fault.
DTCs can be cleared by using the scan tool.
DIAGNOSTIC TROUBLE CODE (DTC) P1336
Diagnostic Aids
Caution: To avoid personal injury when performing
the crankshaft position system variation learning
procedure always set the vehicle parking brake and
block the drive wheels. Release the throttle immedi-
ately when the engine starts to decelerate. Once the
learn procedure is completed, engine control will
be returned to the operator and the engine will re-
spond to throttle position.
DTC P1336 will only set if the ECM has not
learned the CKP system variation. The ECM only
needs to learn this variation once per life cycle of the ve-
hicle unless the crank sensor to crankshaft relationship
is disturbed. Removing a part is considered a distur-
bance. A fully warmed up engine is critical to learning
the variation correctly. If a valid learn occurs, no other
learns can be completed that ignition cycle.
If the engine cuts out before the specified learn proce-
dure engine speed or at normal fuel cutoff rpm, the
ECM is not in the learn procedure mode.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. The On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the fault occurred. The information is then stored on
the scan tool for later reference.
2. Engine temperature is critical to properly learn the
CKP system variation. Failure to properly warm the
engine before performing this procedure will result in
an inaccurate measurement of the CKP system vari-
ation. The ECM learns this variation as the en-
gine is decelerating and then allows engine control to
be returned to the operator. All accessories must be
OFF when learning the CKP system angle variation.
If the A/C is not disabled when the learn procedure is
enabled, the ECM will disable the A/C.
3. If after the specified number attempts the ECM
cannot learn the CKP system variation, then the vari-
ation is too large and no further attempts should be
made until the variation problem is corrected.
4. Being unable to learn the procedure indicates that
the variation is out of range.
5. After the CKP system variation has been learned,
wait above 10 seconds with ignition switch OFF to
prevent being cleared the learned value (
1.5L SOHC).
DAEWOO T-154 BL2,3