2004 DAEWOO LACETTI Iat

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.

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.

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.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 83
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0703
BRAKE SWITCH CIRCUIT MALFUNCTION
Circuit Description
The brake switch is used to indicate brake pedal status to
the transaxle control module(TCM). The brake switch is a
normally open switch. Applying the brake pedal closes the
switch, supplying voltage to the TCM. Releasing the brake
pedal interrupts voltage to the TCM.
This DTC is stored at start–up. If the TCM receives a brake
switch signal after start–up, the DTC will be stored in
memory.
Conditions for Setting The DTC
S Brake switch stuck to closed.
S Brake switch wiring harness shortage to ground.
S Brake switch wiring harness shortage to power.S Immediately after the above condition occurs.
Action Taken When The DTC Sets
S No lamp control required but diagnostic information
should be stored immediately when malfunction is
detected.
S TCM assume that the brake light always active.
Conditions For Clearing The MIL/DTC
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S Inspect the poor wiring harness connection for TCM
connectors and transaxle wiring connectors.
S Inspect the improperly formed or damage terminals.

5A1 – 86IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0705
TRANSMISSION RANGE SENSOR CIRCUIT
MALFUNCTION (PRNDL INPUT)
Circuit Description
The Transmission range switch is located on the selector
shaft and informs the TCM of the current selector lever
position P–R–N–D–3–2–1.
The selector lever position is transmitted to the TCM in en-
coded form along 4 lines. The encoding is such that mal-
functions in the connecting lead are identified.
The TR switch is located on the selector shaft, which is
connected to the selector lever via a pull cable. In addition,
the TR switch controls the starter interlock, the reverse
lights and the selector lever position indicator on the in-
strument panel.
Conditions for Setting The DTC
S TR switch stuck to closed.
S TR switch wiring harness shortage to ground.
S TR switch wiring harness shortage to power.
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.
Conditions for Clearing the MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycles.
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 P0705 sets, the possible cause of TR
switch.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 89
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0710
TRANSMISSION FLUID TEMPERATURE SENSOR
CIRCUIT MALFUNCTION
Circuit Description
The TFT sensor is a positive temperature coefficient
thermistor (temperature sensitive resistor) that provides
information to the TCM regarding transaxle fluid tempera-
ture. The temperature sensor is located in valve body. Cal-
culated temperature is a factor used to determine the shift
time and shift delay time.
The internal electrical resistance of the sensor varies in
relation to the operating temperature of the transaxle fluid.
The TCM sends a 5 volt–reference signal to the tempera-
ture sensor and measures the voltage rise in the electrical
circuit. A higher fluid temperature creates a higher resist-
ance in the temperature sensor, thereby measuring a
higher voltage signal.
The TCM measures this voltage as another input to help
control line pressure, shift schedules and TCC apply.
When transaxle fluid temperature reaches 120°C (248°F)
the TCM enters ”hot mode.” Above this temperature the
TCM modifies transaxle shift schedules and TCC apply in
an attempt to reduce fluid temperature by reducing trans-
axle heat generation.Conditions for Setting The DTC
S The calculated temperature is compared with the
predetermined min. and max. value.
S If the temperature is less than min. value or greater
than max value then the current temperature is re-
garded as of range and the corresponding error but
will be set.
S Transmission fluid temperature is not between
–40°C (–40°F) and 150°C (302°F).
Action Taken When The DTC Sets
S No lamp control required but diagnostic information
should be stored immediately when malfunction is
defected.
S TCM assumes the transaxle fluid temperature is
60°C.
S No influence on drivability.
Conditions for Clearing the MIL/DTC
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S When DTC P0710 sets, the possible cause of fault
could be Transmission Temperature Sensor.

5A1 – 92IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0715
INPUT SPEED SENSOR(ISS) CIRCUIT MALFUNCTION
Circuit Description
Information relative to transaxle input speed to the TCM.
The TCM uses transaxle input speed information to con-
trol line pressure, TCC apply and release and transaxle
shift patterns. This information is also uses to calculate the
appropriate operating gear ratios and TCC slippage.
The input speed sensor mounts onto piston B that is inside
of valve body.
An air gap of 1.8~2.2mm(0.07~0.086inch) is maintained
between the sensor and the piston B.
The sensor consists of a permanent magnet surrounded
by a coil of wire. As the piston B is driven by the turbine
shaft, an AC signal is induced by the input speed sensor.
Higher vehicle speeds induce a higher frequency and volt-
age measurement at the sensor.
Sensor resistance should measure between 825~835
ohms at 20°C(68°F). Sensor can measure from
1,000~8,000HZ.
Conditions for Setting The DTC
S Input speed is more than 7,000 rpm.
S System voltage is too high or too low.S TCM or ECM is defective.
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, position P, R and N also possible.
S Open lock up clutch.
Conditions for Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycles.
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 P0715 sets, the possible cause of fault
could be ISS(input speed sensor).

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 95
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE(DTC) P0716
INPUT SPEED SENSOR(ISS) CIRCUIT
RANGE/PERFORMANCE
Circuit Description
Information relative to transaxle input speed to the TCM.
The TCM uses transaxle input speed information to con-
trol line pressure, TCC apply and release and transaxle
shift patterns. This information is also uses to calculate the
appropriate operating gear ratios and TCC slippage.
The input speed sensor mounts onto piston B that is inside
of valve body.
An air gap of 1.8~2.2mm(0.07~0.086inch) is maintained
between the sensor and the piston B.
The sensor consists of a permanent magnet surrounded
by a coil of wire. As the piston B is driven by the turbine
shaft, an AC signal is induced by the input speed sensor.
Higher vehicle speeds induce a higher frequency and volt-
age measurement at the sensor.
Sensor resistance should measure between 825~835
ohms at 20°C(68°F). Sensor can measure from 1,000~
8,000HZ.
Conditions for Setting The DTC
S The increasing rate of the turbine speed is more
than 45,000 rpm/sec.
S System voltage is greater than 8.5 volts.
S Engine is running.S No engine speed error DTCs P0727, P0725.
S Gear position is D.
S TCM or ECM is defective.
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, position P, R and N also possible.
S Open lock up clutch.
Conditions for Clearing The MIL/DTC
S The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycles.
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 P0716 sets, the possible cause of fault
could be ISS(input speed sensor).