NO.29 DOES NOT UPSHIFT IN M POSITION [FN4A-EL]

id050301825500

29
Does not upshift in M position
DESCRIPTION
•  Gear position indicator light in instrument cluster illuminates but vehicle does not upshift when the selector lever is pushed to “+” side.
POSSIBLE CAUSE
•  Up 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 [PCM (FN4A-EL)].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect the AT_S_UP_SW PID value using the M-MDS.
(See PID/DATA MONITOR INSPECTION [INSTRUMENT CLUSTER].)
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 up switch.
(See UP SWITCH INSPECTION [FN4A-EL].)
If the up switch has a malfunction:
•  Replace the up switch.
If the up switch is normal:
•  Inspect for continuity between selector lever component terminal C (wiring harness-side) and instrument cluster terminal F (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 1.6].)