5A
TCM Power and Ground Circuit Check
Wiring Diagram
1. TCM [A]: Terminal arrangement of TCM connector (M13 engine model with VVT) (viewed from harness side)
2. Ignition switch [B]: Terminal arrangement of TCM connector (M13 engine model without VVT) (viewed from harness side)
Troubleshooting
Step Action YES NO
1
Check TCM back-up power circuit
1) Disconnect TCM connector with ignition switch OFF.
2) Check for proper connection to TCM at “E121-24” [A] or “E123-13” [B] terminal.
3) If OK, check voltage at terminal “E121-24” [A] or “E123-13” [B] of disconnected TCM connector.
Is it 10 – 14 V?
Go to Step 2.
“B/W” wire open or shorted to ground.
2
Check TCM power circuit
1) Disconnect TCM connector with ignition switch OFF.
2) Check for proper connection to TCM at “E121-6” [A] or “E123-20” [B] terminal.
3) If OK, turn ignition switch ON and check voltage at terminal “E121-6” [A] or “E123-20” [B] of disconnected TCM connector.
Is it 10 – 14 V?
Go to Step 3.
“BLU/ORN” circuit open or shorted to ground.
3
Check TCM ground circuit
1) Turn ignition switch OFF.
2) With TCM connectors disconnected, check for proper connection to TCM at “E121-1” / “E121-23” [A] or “E123-15” / “E123-19” [B] terminal.
3) If OK, check for resistance between “E121-1” / “E121-23” [A] or “E123-15” / “E123-19” [B] terminal of disconnected TCM connector and body ground.
Is continuity indicated?
TCM power and ground circuits are in good condition.
“BLK” circuit for TCM ground open.