2004 DAEWOO LACETTI aisin automatic transaxle

AISIN AUTOMATIC TRANSAXLE 5A2 – 69
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0743
TORQUE CONVERTER CLUTCH (TCC) ELECTRICAL
Conditions for Setting the DTC
S TCM detects that the ON signal of the lockup sole-
noid monitor during 0.5 seconds when lockup sole-
noid driver outputs the OFF signal.(When the TCC
circuit is open or short to battery).
S The above detection 2 times at shifting continuous-
ly.(When the Tcc circuit is open or short to battery).
S TCM detects that the OFF signal of the lockup sole-
noid monitor during 0.3 seconds when lockup sole-
noid driver outputs the ON signal.(When the TCC
circuit is short to ground).
S The above detection 1 time at shifting continuous-
ly.(When the TCC circuit is short to ground).
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects failures on two consecu-
tive ignition cycles.
S No TCC lockup solenoid
S 1st gear fixed under the 10km/hConditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
S TCM detects the ON signal of the lockup solenoid
monitor during 160 ms when lockup solenoid driver
outputs the ON signal and TCM detects the OFF
signal of the lockup solenoid monitor during 160 ms
when lockup solenoid driver outputs the OFF sig-
nal.
Cause of Failure
S Wiring harness or connector between lockup sole-
noid and TCM
S Lockup solenoid
S TCM

5A2 – 70IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DTC P0743 Torque Converter Clutch (TCC) Electrical
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform two vehicle drive cycles.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0743 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and lock–up solenoid. Refer to ”Unit In-
spection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal A5
and A23.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector Inspection” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of between the vehicle har-
ness and lockup solenoid.
2. Disconnect the connector (X–3) of T/M wire
and inspect the resistance between lock–up
solenoid connector terminal 4 and ground.
Is the measurement within the specified value?20°C (68°F)
11–16 WGo to Step 7Go to Step 8
61. Replace the master TCM.
2. Perform the reproducing test under user condi-
tion after confirming no DTC.
Is DTC displayed?–Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)Replace the
TCM

AISIN AUTOMATIC TRANSAXLE 5A2 – 71
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
71. Estimate the failure of the vehicle wiring har-
ness or between connectors.
2. Inspect continuity and short circuit for the ve-
hicle wiring harness and inspect the connection
condition between connectors (C–3). Refer to
”Wiring Harness and Connector Inspection” in
this section.
Is the condition OK?–Repair the tem-
porary connec-
tion failure of
connectorReplace the ve-
hicle harness
or adjustment
between con-
nectors
81. Estimate the failure of T/M wire or between
connectors of lockup solenoid.
2. Inspect the lockup solenoid. Refer to ”Unit In-
spection” in this section.
Is the problem found?–Replace the
lockup solenoidGo to Step 9
91. Estimate the failure of T/M wire.
Inspect continuity and short circuit for the T/M wire
and inspect the connection condition between con-
nectors (C–6). Refer to ”Wiring Harness and Con-
nector Inspection” in this section.
Is the condition OK?–Repair the tem-
porary connec-
tion failure of
connectorReplace the
T/M wire or ad-
justment be-
tween connec-
tors

5A2 – 72IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0748
PRESSURE CONTROL SOLENOID (PCS) ELECTRICAL
Conditions for Setting the DTC
S TCM detects that the feed back voltage is greater
than 4.9 volts and detects the detection 500 milli-
seconds continuously.(When the PCS circuit is
short to battery).
S TCM detects that the feed back voltage is less than
70.mV for 70 milliseconds and detects the 12.5
seconds continuously.(When the PCS circuit is
short to ground or open).
Action Taken When the DTC Sets
S TCM will request the illumination of MIL and store
DTC when TCM detects a failure on the first ignition
cycle.
S No lockup control
S No engine torque reduction control
S No engagement pressure control
S No 4th gearS No self–learning control
S After failure decision : emergency mode
Conditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
S TCM detects the feed back voltage is between
70mV and 4.9 v for 12.5 seconds continuously.
Cause of Failure
S Wiring harness or connector between Pressure
Control Solenoid (PCS) and TCM
S PCS
S TCM

AISIN AUTOMATIC TRANSAXLE 5A2 – 73
DAEWOO V–121 BL4
DTC P0748 Pressure Control Solenoid (PCS) Electrical
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycle.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0748 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and Pressure Control Solenoid (PCS).
Refer to ”Unit Inspection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal A4
and A2.
Is the measurement within the specified value?20°C (68°F)
5.0–5.6 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of between the vehicle har-
ness and PCS.
2. Disconnect the connector (X–3) of T/M wire
and inspect the resistance between PCS con-
nector terminal 3 and 8.
Is the measurement within the specified value?20°C (68°F)
5.0–5.6 WGo to Step 7Go to Step 8
61. Replace the master TCM.
2. Perform the reproducing test under user condi-
tion after confirming no DTC.
Is DTC displayed?–Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)Replace the
TCM

5A2 – 74IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
71. Estimate the failure of the vehicle wiring har-
ness or between connectors.
2. Inspect continuity and short circuit for the ve-
hicle wiring harness and inspect the connection
condition between connectors (C–3). Refer to
”Wiring Harness and Connector” in this section.
Is the condition OK?–Repair the tem-
porary connec-
tion failure of
connectorReplace the ve-
hicle harness
or adjustment
between con-
nectors
81. Estimate the failure of T/M wire or between
connectors of PCS.
2. Inspect the PCS. Refer to ”Unit Inspection” in
this section.
Is the problem found?–Replace the
valve body as-
sembly.(No re-
placement PCS
by itself)Go to Step 9
91. Estimate the failure of T/M wire.
Inspect continuity and short circuit for the T/M wire
and inspect the connection condition between con-
nectors (C–6). Refer to ”Wiring Harness and Con-
nector” in this section.
Is the condition OK?–Repair the tem-
porary connec-
tion failure of
connectorReplace the
T/M wire or ad-
justment be-
tween connec-
tors

AISIN AUTOMATIC TRANSAXLE 5A2 – 75
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0751
SHIFT SOLENOID 1 (SS1) STUCK OFF
Conditions for Setting the DTC
S Shift Solenoid 1 (SS1) is stuck ON/OFF.
S D range selected
S Engine water normal temperature
S 20 seconds have passed since the transaxle was
placed in D.
S Engine revolution is 600 rpm or greater.
S No failure of output speed sensor / input speed
sensor / engine revolution / water temperature sig-
nal / solenoid electrical / ranger sensor / throttle
signal
Action Taken When the DTC SetsS TCM will request the illumination of MIL and store
DTC when TCM detects failures on two consecu-
tive ignition cycles.
Conditions for Clearing the DTC
S The TCM turns off the MIL when no further failures
detected for three consecutive ignition cycles.
S The scan tool can clear the DTC from the TCM his-
tory.
S The TCM clears the DTC from the TCM history
memory after forty consecutive warm up cycles
without fault.
Cause of Failure
S Shift Solenoid 1 (SS1)
S Inside Valve Body
S TCM

5A2 – 76IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DTC P0751 Shift Solenoid 1 (SS1) Stuck Off
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform two vehicle drive cycles.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0751 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
31. Turn the ignition OFF.
2. Replace the master TCM and perform simula-
tion test again under user condition.
Is DTC P0751 reappeared?–Go to Step 4Replace the
TCM.
41. Estimate the failure of Shift Solenoid 1 or inter-
nal valve body.
2. Inspect the SS1. Refer to ”Unit Inspection” in
this section.
Is the condition of SS1 OK?–Replace the
valve body as-
sembly.Replace Shift
Solenoid 1
(SS1).