NO.30 DOES NOT DOWNSHIFT IN M RANGE [FN4A-EL]

id050301803500

30
Does not downshift in M range
DESCRIPTION
•  Gear position indicator light in instrument cluster illuminates but vehicle does not downshift when the selector lever is pushed to “–” side.
POSSIBLE CAUSE
•  Down switch (built-in selector lever component) or related wiring harness malfunction
Note
•  Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FN4A-EL].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect the DWN SW PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Inspect the instrument cluster.
(See INSTRUMENT CLUSTER INSPECTION.)
Replace the instrument cluster if necessary.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Inspect the down switch.
(See DOWN SWITCH INSPECTION [FN4A-EL].)
If the down switch has a malfunction:
•  Replace the down switch.
If the down switch is normal:
•  Inspect for continuity between selector lever component terminal C (wiring harness-side) and PCM terminal 1J (wiring harness-side).
•  Repair or replace the any malfunctioning parts according to the inspection results.
2
•  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 PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)