NO.30 DOES NOT DOWNSHIFT IN M RANGE [FS5A-EL]

id050308803500

30

Does not downshift in M range
DESCRIPTION
•  Gear position indicator light in instrument cluster illuminates but vehicle does not downshift when selector lever is pushed to “–” side or steering shift switch “DOWN” is pushed.
POSSIBLE CAUSE
•  Down switch (built-in selector lever component) or related wiring harness malfunction
•  Steering shift switch or related wiring harness malfunction (with steering shift switch)
Note
•  Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FS5A-EL].) (See BASIC INSPECTION [FS5A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  DWN SW
Is the PID value normal?
Yes
With steering shift switch:
•  Go to the next step.
Without steering shift switch:
•  Inspect the instrument cluster.
•  Replace the instrument cluster if necessary.
No
Inspect the down switch.
(See SELECTOR LEVER COMPONENT INSPECTION.)
If the down switch has a malfunction:
•  Replace the selector lever component.
If the down switch is normal:
•  Inspect for continuity between selector lever component terminal C and TCM terminal 2F.
•  Repair or replace any malfunctioning parts according to the inspection result.
2
Inspect the value at the following TCM PID using the M-MDS when the steering shift switch “DOWN” is pushed.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  DWN SW
Is the PID value normal?
Yes
Inspect the instrument cluster.
(See INSTRUMENT CLUSTER INSPECTION.)
Replace the instrument cluster if necessary.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Inspect the steering shift switch.
(See STEERING SHIFT SWITCH INSPECTION.)
If the steering shift switch has a malfunction:
•  Replace the steering shift switch.
If the steering shift switch is normal:
•  Inspect the following wiring harness.
―  Between steering shift switch (LH) terminal A and TCM terminal 2N
―  Between steering shift switch (RH) terminal A and TCM terminal 2Q
―  Between steering shift switch (LH) terminal C and steering shift switch (RH) terminal E
―  Between steering shift switch (LH) terminal D and steering shift switch (RH) terminal D
•  Repair or replace any malfunctioning parts according to the inspection result.
3
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.