Daewoo MATIZ Service Manual page 362

1F – 264 ENGINE CONTROLS
DIAGNOSTIC TROUBLE CODE (DTC) – P0605 ENGINE CONTROL MODULE
Circuit Description
The engine control module (ECM) is the control center of
the fuel injection system. It constantly looks at the infor-
mation from various sensors, and controls the systems
that after vehicle performance. The ECM also performs
the diagnostic function of the system. It can recognize op-
erational problems, alert the driver through the Malfunc-
tion Indicator Lamp (MIL), and store a Diagnostic Trouble
Code (DTC) or DTCs which identify the problem areas to
aid the technician in making repairs. An electrically eras-
able programmable read only memory (EEPROM) is
used to house the program information and the calibra-
tions required for engine, transaxle, transaxle diagnos-
tics operation. The ECM uses a value called a checksum
for error detection of the software. The checksum is a val-
ue that is equal to all the numbers in the software added
together. The ECM adds all the values in the software
and if that value does not equal the checksum value, a
checksum error is indicated.
DTC P0605 Engine Control Module NMVY Write Error
Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
Replace the engine control module(ECM).
2
Is the replacement complete?
1. Using the scan tool, clear the DTCs.
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the conditions for
3
setting this DTC ad specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
Check if any additional DTCs are set.
4
Are any DTCs displayed that have not been
diagnosed?
NMVY WRITE ERROR
Action
Conditions for Setting the DTC
D The ECM detects more than 3 incorrect checksum.
Action taken when The DTCs Sets
D The Malfunction Indicator Lamp (MIL) will illuminate.
D The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.
D A history DTC is stored.
D Coolant fan turns on.
Conditions for Clearing the MIL/DTC
D The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault.
D A history DTC will clear after 40 consecutive warm-up
cycles without a fault.
D DTC(s) can be cleared by using the scan tool.
Value(s)
–
Go to Step 2
–
Go to Step 3
–
Go to Step 4
applicable DTC
–
Yes No
Go to
"On-Board
Diagnostic
System Check"
–
Go to Step 2
Go to
table System OK
DAEWOO M-150 BL2