Procedure 20

20. A/T DOES NOT SHIFT: D2 -> D1

SYMPTOM:
The vehicle does not shift down from the 2nd to the 1st gear.

DIAGNOSTIC PROCEDURE
1. PNP SWITCH CIRCUIT
With CONSULT-II
Does "TCM INPUT SIGNALS" in "DATA MONITOR" show damage to PNP switch circuit?
No Tools
Does self-diagnosis show damage to PNP switch circuit?
Yes or No
Yes >> Check PNP switch circuit.
No >> GO TO 3.
2. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG?
OK >> INSPECTION END
NG >>
1. Repair or replace damaged parts.
2. Replace the transmission assembly.