Suzuki Liana RH418, Supplementary Service Manual

Page: 283 / 371

Automatic Transmission/Transaxle: 5A-57
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Clear DTCs in TCM memory.
2) Start engine and run it for 1 minute.
3) Check DTC.
DTC Troubleshooting
DTC detecting condition Trouble area
Voltage of torque reduction signal circuit TCM terminal is low
although TCM does not require ECM to reduce engine
torque. • Torque reduction signal circuit from TCM to ECM
malfunction.
• TCM
• ECM
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 to 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 4 – 6 V?
Intermittent trouble or
faulty TCM or ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”.
If OK, substitute a
known-good TCM or
ECM and recheck. Faulty ECM.