Suzuki Liana RH413, Service Manual

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5A-72 Automatic Transmission/Transaxle:
DTC Troubleshooting
Inspection of TCM and Its Circuits
S3RH0A5104038
TCM and its circuits can be checked at TCM wiring connectors by measuring voltage and resistance.
CAUTION
!
TCM cannot be checked by itself, it is strictly prohibited to connect voltmeter or ohmmeter to TCM with
connector disconnected from it.
1) Remove TCM (1) from vehicle referring to “Transmission Control Module (TCM) Removal and Installation”.
2) Connect TCM connectors (2) to TCM.
3) Check voltage at each terminal of connectors connected.
NOTE
As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition
switch is ON.
Step Action Yes No
1 Was “A/T System Check” performed? Go to Step 2. Go to “A/T System
Check”.
2 Check torque reduction signal circuit for open
1) Turn ignition switch OFF.
2) Disconnect TCM and ECM connectors from TCM and
ECM.
3) Check continuity between terminal “G07-18” of
disconnected harness side TCM connector and terminal
“G03-12” of disconnected harness side ECM connector.
Is continuity indicated?
Go to Step 3. “LT GRN/RED” circuit
open.
3 Check torque reduction signal circuit for ground short
1) Check continuity between terminal “G07-18” of
disconnected harness side TCM connector and ground.
Is continuity indicated?
“LT GRN/RED” circuit
shorted ground. Go to Step 4.
4 Check power supply from ECM
1) Connect ECM connectors to ECM.
2) Turn ignition switch ON.
3) Measure voltage between terminal “G03-12” of
connected harness side ECM connector and ground.
Is it 9 – 14 V?
Intermittent trouble or
faulty TCM or ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
If OK, substitute a
known-good TCM or
ECM and recheck. Faulty ECM.
3. Body ground
1
2
3
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