TCM Power Supply and Ground Circuit Check: Troubleshooting

WARNING: This page is about a different variant/trim than selected.

TCM POWER SUPPLY AND GROUND CIRCUIT TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Back up power supply circuit check Turn off ignition switch and disconnect connectors from TCM. Check for proper terminal connection to TCM connectors. If connections are OK, check that voltage between back up power supply circuit (A1) and vehicle body ground is battery voltage. Is it in good condition?	Go to Step 2.	Repair or replace defective wire harness.
2	CVT relay power supply circuit (switch side) check Remove CVT relay. Check for proper terminal connection for CVT relay connector. If connections are OK, check that voltage between CVT relay power supply circuit (switch side) (B1) and vehicle body ground is battery voltage. Is it in good condition?	Go to Step 3.	Repair or replace defective wire harness.
3	CVT relay power supply (coil side) circuit check Turn ignition switch to ON position. Check that voltage between CVT relay power supply circuit (coil side) (B2) and vehicle body ground is battery voltage. Is it in good condition?	Go to Step 4.	Repair or replace defective wire harness.
4	CVT relay ground circuit check Check that voltage between CVT relay power supply circuit (coil side) (B2) and ground circuit (B3) is battery voltage. Is it in good condition?	Go to Step 5.	Repair or replace defective wire harness.
5	CVT relay check Check CVT relay. See CVT Relay Inspection Is it in good condition?	Go to Step 6.	Replace CVT relay.
6	Main power supply circuit check Turn off ignition switch and install CVT relay. Turn ignition switch to ON position. Check that voltage between main power supply circuit 1 (A2) or main power supply circuit 2 (A3) and vehicle body ground are battery voltage. Are they in good condition?	Go to Step 7.	Repair or replace defective wire harness.
7	TCM ground circuit check Turn off ignition switch. Check that resistance between each TCM ground circuit 1 (C1) and ground circuit 2 (C2) and vehicle body ground are less than 1 Ω. Are they in good condition?	TCM power and ground circuit is in good condition.	Repair or replace defective wire harness.