2004 DAEWOO LACETTI ignition

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 73
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
13Repair the circuit from EF1 to terminal B3 of the TCM
for a short to power.
Is the repair complete?–System OK–
141. Turn the ignition OFF.
2. Disconnect the C206 connector.
3. Measure the resistance between F2 fuse and
terminal C15 or C16 of the TCM wiring connec-
tor.
Is the resistance within the values shown?0ΩGo to Step 15Go to Step 15
15Repair the circuit(between F2 and terminal C15 or
C16) for a short to ground and open.
Is the repair completed?–System OK–
161. Turn the ignition ON.
2. Measure the voltage of the terminal C15 or
C16(TCM wiring connector).
Is the voltage within the values shown?11–14VGo to Step 17Go to Step 18
17Repair the circuit(between F2 and terminal C15 or
C16) for short to power.
Is the repair complete?–System OK–
181. Inspect the transaxle wiring for poor electrical
connections at the transaxle connector.
2. Look for possible bent, backed out, deformed,
or damaged terminals.
3. Check for weak terminal tension.
Was a condition found?–Verify repair
and Go to Step
1Go to Step 19
19Replace the TCM.
Is the replacement complete?–Go to Step 20–
201. After the repair, use a scan tool ”clear info”
function and road test the vehicle.
2. Review the ”DTC info”.
Has the last test failed or is the current DTC dis-
played?–Begin diagno-
sis againRepair verified
exit DTC chart

5A1 – 74IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0601
INTERNAL CONTROL MODULE MEMORY CHECKSUM
ERROR
Circuit Description
A normal function of the Transmission Control Module
(TCM) programming is to perform an internal check that
verifies the integrity of the RAM memory allocations.
The DTC P0601 sets when the Random Access
Memory(RAM) is not operating correctly when checked on
initialization. An area of RAM is failed a read/ write test.
Conditions For Setting The DTC
S The EEPROM checksum test is separated in two
independent parts, the code checksum test and the
calibration checksum test. For each area the check-
sum is calculated and compared with the corre-
sponding checksum valve. If the valves are differ-
ent, the fault will be set.
S System voltage is too high or too low.
S Transaxle input voltage is too high or too low.
S Immediately after the above condition occurs.
Action Taken When The DTC SetsS The Malfunction Indicator Lamp(MIL) will illuminate.
S The TCM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Failure Records buffer.
S Adopt Emergency/ Substitute mode and constant
4th gear by hydraulic control.
S After ignition OFF/ON : 3rd gear by hydraulic con-
trol. Possible P, R and N also possible.
S Power supply cut off to the EDS valve.
Conditions For Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycle.
S A history DTC will clear after 40 consecutive warm
up cycles without a fault.
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S When DTC P0601 sets, the possible cause of fault
could be TCM.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 75
DAEWOO V–121 BL4
DTC P0601 – Internal Control Module Memory Checksum Error
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the check completed?–Go to Step 2Go to ”On–
Board Diagnos-
tic System
Check”
21. Install the scan tool.
2. Turn the ignition ON, with the engine OFF.
Does the scan tool display P0601?–Go to Step 3Go to ”Diag-
nostic Aids”
31. Turn the ignition OFF.
2. Replace the TCM.
Is the action complete?–Go to Step 4–
41. Using the scan tool, clear the DTCs.
2. Road test the vehicle within the conditions for
setting this DTC as specified in the text.
Does the scan tool indicate that this diagnostic has
run and passed?–Go to Step 5Go to Step 2
51. Check if any DTCs are set.
2. Are any DTCs displayed that have not been
diagnosed?–Go to ”Applica-
ble DTC table”System OK

5A1 – 76IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0603
INTERNAL CONTROL MODULE KEEP ALIVE
MEMORY(KAM) ERROR
Circuit Description
A normal function of the Transmission Control Module
(TCM) programming is to perform an internal check that
verifies the integrity of the KAM memory allocations.
The DTC P0603 sets when the keep alive memory (KAM)
is not operating correctly when checked on initialization.
An area of KAM is failed a read/ write test.
Conditions For Setting The DTC
S The checksum of the current regulator data will be
tested. If the checksum is not OK, then the error bit
will be set.
S If writing to FLASH during power latch phase failed.
S Each of the flash blocks has its own status which is
located at the beginning of the each flash block and
the status of the FLASH blocks do not fit together.
S System voltage is too high or too low.
S Transaxle input voltage is too high or too low.
S Immediately after the above condition occurs.Action Taken When The DTC Sets
S The Malfunction Indicator Lamp(MIL) will illuminate.
S The TCM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Failure Records buffer.
S Adopt Emergency/ Substitute mode and constant
4th gear by hydraulic control.
S After ignition OFF/ON : 3rd gear by hydraulic con-
trol. Possible P, R and N also possible.
S Power supply cut off to the EDS valve.
Conditions For Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycle.
S A history DTC will clear after 40 consecutive warm
up cycles without a fault.
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S When DTC P0603 sets, the possible cause of fault
could be TCM.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 77
DAEWOO V–121 BL4
DTC P0603 – Internal Control Module Keep Alive Memory(KAM)
Error
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the check completed?–Go to Step 2Go to ”On–
Board Diagnos-
tic System
Check”
21. Install the scan tool.
2. Turn the ignition ON, with the engine OFF.
Does the scan tool display P0603?–Go to Step 3Go to ”Diag-
nostic Aids”
31. Turn the ignition OFF.
2. Replace the TCM.
Is the replacement complete?–Go to Step 4–
41. Using the scan tool, clear the DTCs.
2. Road test the vehicle within the conditions for
setting this DTC as specified in the text.
Does the scan tool indicate that this diagnostic has
run and passed?–Go to Step 5Go to Step 2
51. Check if any DTCs are set.
2. Are any DTCs displayed that have not been
diagnosed?–Go to ”Applica-
ble DTC table”System OK

5A1 – 78IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0604
INTERNAL CONTROL MODULE RANDOM ACCESS
MEMORY(RAM) ERROR
Circuit Description
A normal function of the Transmission Control Module
(TCM) programming is to perform an internal check that
verifies the integrity of the RAM memory allocations.
The DTC P0604 sets when the Random Access
Memory(RAM) is not operating correctly when checked on
initialization. An area of RAM is failed a read/ write test.
Conditions For Setting The DTC
S An area of RAM is failed a read/ write test.
S System voltage is too high or too low.
S Transaxle input voltage is too high or too low.
S Immediately after the above condition occurs.
Action Taken When The DTC Sets
The Malfunction Indicator Lamp(MIL) will illuminate.S The TCM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Failure Records buffer.
S Adopt Emergency/ Substitute mode and constant
4th gear by hydraulic control.
S After ignition OFF/ON : 3rd gear by hydraulic con-
trol. Possible P, R and N also possible.
S Power supply cut off to the EDS valve.
Conditions For Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycle.
S A history DTC will clear after 40 consecutive warm
up cycles without a fault.
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S When DTC P0604 sets, the replacement of TCM is
recommended.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 79
DAEWOO V–121 BL4
DTC P0604 – Internal Control Module Random Access
Memory(RAM) Error
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the check completed?–Go to Step 2Go to ”On–
Board Diagnos-
tic System
Check”
21. Install the scan tool.
2. Turn the ignition ON, with the engine OFF.
Does the scan tool display P0604?–Go to Step 3Go to ”Diag-
nostic Aids”
31. Turn the ignition OFF.
2. Replace the TCM.
Is the action complete?–Go to Step 4–
41. Using the scan tool, clear the DTCs.
2. Road test the vehicle within the conditions for
setting this DTC as specified in the text.
Does the scan tool indicate that this diagnostic has
run and passed?–Go to Step 5Go to Step 2
51. Check if any DTCs are set.
2. Are any DTCs displayed that have not been
diagnosed?–Go to ”Applica-
ble DTC table”System OK

5A1 – 80IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0606
TRANSAXLE CONTROL MODULE PROCESSOR FAULT
Circuit Description
In case that TCM reset has occurred by software (warm
reset) not by ignition key ON, TCM increments software
reset counter. If the counter exceeds the permissible max-
imum value for the software count then the fault will be de-
tected.
Conditions For Setting The DTC
S System voltage is too high or too low.
S Transaxle input voltage is too high or too low.
S Immediately after the above condition occurs.
Action Taken When The DTC SetsS The Malfunction Indicator Lamp(MIL) will illuminate.
S The TCM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Failure Records buffer.
S Adopt Emergency/ Substitute mode and constant
4th gear.
S Power supply cut off to the EDS valve.
Conditions For Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycle.
S A history DTC will clear after 40 consecutive warm
up cycles without a fault.
S Using a scan tool can clear history DTCs.