A/T Does Not Shift: 2nd Gear ---> 1st Gear

A/T Does Not Shift: 2nd gear ---> 1st gear

SYMPTOM: When shifted from 2[2] to 1[1] position, does not downshift from 2nd to 1st gears.

DIAGNOSTIC PROCEDURE

1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to TM-35, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to TM-35, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
NO >> GO TO 2.

2. CHECK 1ST POSITION SWITCH CIRCUIT

With CONSULT-III
1. Turn ignition switch "ON".
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out "1 POSITION SW" switch moving selector lever to each position.





Without CONSULT-III
1. Turn ignition switch "ON". (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.





OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to TM-180, "Checking the A/T Fluid (ATF)". Procedures
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.

4. CHECK CONTROL CABLE
Check the control cable.
^ Refer to TM-196, "Inspection and Adjustment". Adjustments
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable. Refer to TM-196, "Inspection and Adjustment". Adjustments

5. CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition. Refer to TM-180, "Checking the A/T Fluid (ATF)". Procedures
OK or NG
OK >> GO TO 6.
NG >> GO TO 9.

6. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-152, "Symptom Chart" (Symptom No.17). Symptom Chart
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

7. CHECK SYMPTOM
Check again. Refer to TM-194, "Cruise Test - Part 3". Cruise Test - Part 3
OK or NG
OK >> INSPECTION END
NG >> GO TO 8.

8. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-113, "TCM Terminals and Reference Values". Pinout Values and Diagnostic Parameters
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.

9. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-152, "Symptom Chart" (Symptom No.17). Symptom Chart
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.