Specifications
5A2 – 70IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
DTC P0743 Torque Converter Clutch (TCC) Electrical
Step Action Value(s) Yes No
1
1. 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 2 Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
2
1. 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 3 Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector In-
spection” in this
section.)
3
1. 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 W
Go to Step 4 Go to Step 5
4
1. 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 6 Repair the wir-
ing harness
connectors.
5
1. 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 W
Go to Step 7 Go to Step 8
6
1. 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