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5A-90 Automatic Transmission:
TCM Power and Ground Circuit Check
Wiring Diagram
1. TCM
2. A/T relay
Troubleshooting
Step
1
Check TCM back-up power circuit
1) Disconnect TCM connector with ignition switch OFF.
2) Check for proper connection to TCM at "C34-24"
terminal.
3) If OK, check voltage at terminal "C34-24" of
disconnected TCM connector.
Is it 10 – 14 V?
2
Check TCM power circuit
1) Disconnect TCM connector with ignition switch OFF.
2) Check for proper connection to TCM at "C34-6" terminal.
3) If OK, turn ignition switch ON and check voltage at
terminal "C34-6" of disconnected TCM connector.
Is it 10 – 14 V?
3
Check A/T relay operation
1) Check A/T relay operation referring to "A/T Relay
Inspection: ".
Is check result satisfactory?
1
C34-24
C34-6
C34-1
C34-23
[A]
C34
6
24 23
3. Ignition switch
[A]: Terminal arrangement of TCM connector (viewed from harness side)
Action
WHT/RED
2
+BB
YEL/BLK
YEL/BLU
BLK
LT GRN/BLK
BLK
BLK
C35
1
Yes
Go to Step 2.
Go to Step 4.
"YEL/BLK", "YEL/BLU",
"LT GRN/BLK" or "BLK"
circuit for power supply
open.
S4RS0A5104039
3
No
"WHT/RED" circuit open
or shorted to ground.
Go to Step 3.
Replace A/T relay.
I4RS0A510023-
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