Daewoo CIELO EURO III, Руководство пользователя

Страница: 524 / 603

1F – 354 ENGINE CONTROLS
DAEWOO T-154 BL2,3
DIAGNOSTIC TROUBLE CODE (DTC) P0601
ECM CHECKSUM ERROR
Circuit Description
The engine control
module (ECM) is the control center of the fuel injection
system. It constantly looks at the information from vari-
ous sensors, and controls the systems that affect ve-
hicle 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) (Check Engine), and store a
Diagnostic Trouble Code (DTC) or DTCs which identify
the problem areas to aid the technician in making re-
pairs. An Electrically Erasable Programmable Read
Only Memory (EEPROM) is used to house the program
information and the calibrations required for engine,
transmission, and powertrain diagnostics operation. The
ECM uses a value called a checksum for error
detection of the software. The checksum is a value that
is equal to all the numbers in the software added togeth-
er. The ECM adds all the values in the software
and if that value does not equal the checksum value, a
checksum error is indicated.
Conditions for Setting the DTC
D
The ECM detects incorrect checksums.
D
Program ID is not equal to value in S/W.
Action Taken When the DTC Sets
D
The MIL will illuminate.
D
The ECM will attempt to record operating condi-
tions at the time the failure is detected. However,
since this is an internal ECM failure, this infor-
mation may or may not be reliable. This information
will be stored in the Freeze Frame and Failure Re-
cords buffers.
D
A history DTC is stored.
Conditions for Clearing the MIL/DTC
D
The MIL will turn off after three (four –
1.5L SOHC) 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.
Test Description
Number(s) below refer to the step number(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 malfunction occurred. The information is then
stored on the scan tool for later reference.
2. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.
DTC P0601 ECM Checksum Error
Step Action Value Yes No
1
Perform an On-Board Diagnostic (EOBD) System
Check.
Is the system check complete?
–
Go to Step 2
Go to “On-
Board Diag-
nostic System
Check”
2
Replace the en-
gine control module (ECM).
Is the action complete?
–
Go to Step 3
–
3
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
–
Go to Step 4 Go to Step 2
4
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?
– Go to applicable
DTC table System OK