TCM Power and Ground Circuit Check: Troubleshooting

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

TROUBLESHOOTING TABLE

Step	Action	YES	NO
1	Check TCM back-up power supply circuit Disconnect connectors from TCM with ignition switch turned OFF. Check for proper connection to "C06-6" and "C06-24" terminals of TCM connector. If OK, measure voltage between "C06-24" terminal of disconnected TCM connector and ground. Is voltage 10 - 14 V?	Go to Step 2.	"WHT/RED" circuit is open or shorted to ground.
2	Check TCM power supply circuit Turn ignition switch to ON position. Measure voltage between "C06-6" terminal of disconnected TCM connector and ground. Is voltage 10 - 14 V?	Go to Step 5.	Go to Step 3.
3	Check A/T relay Turn ignition switch to OFF position. Remove A/T relay. Check A/T relay for operation by referring to A/T RELAY INSPECTION . Is it in good condition?	Go to Step 4.	Replace A/T relay.
4	Check TCM power supply circuit Turn ignition switch to ON position. Measure voltage between "YEL/BLU" and "LT GRN/BLK" terminals of A/T relay connector and ground. Is each voltage 10 - 14 V?	Go to Step 5.	"YEL/BLU" and/or "LT GRN/BLK" circuit are open or shorted to ground.
5	Check TCM ground circuit Turn ignition switch to OFF position. Check for proper connection to "C06-1" and "C06-23" terminals of TCM connector. Measure resistance as follows. Between "C06-1" terminal of TCM connector and vehicle body ground. Between "C06-23" terminal of TCM connector and vehicle body ground. Is each resistance 1 Ω or less?	Substitute a known-good TCM and recheck.	"BLK" circuit is open.