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7B-30 AUTOMATIC TRANSMISSION (4 A/T)
TCM POWER AND GROUND CIRCUIT CHECK
1. Battery
2. Main fuse
3. Ignition switch
DTC DETECTING CONDITION
• Automatic transmission doesn't shift to 1st gear at vehicle start in "D" range.
Step
1
Check voltage between terminal "C44-2" of
TCM coupler and body ground with ignition
switch ON.
Is it 10 – 14 V?
2
Check voltage between terminal "C44-15" of
TCM coupler and body ground with ignition
switch ON.
Is it about 0 V?
4. Circuit fuse (IG)
7. TCM
5. Ground
6. A/T relay
Action
Yes
Go to Step 2.
Poor "C44-2" or "C44-15"
connection.
If all above are OK,
replace known-good TCM
and recheck.
No
YEL/BLK wire open or
faulty
A/T relay.
"BLK" wire open.
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