NO.9 ABNORMAL SHIFTING [FN4A-EL]

id050301801400

9
Abnormal shifting
DESCRIPTION
•  Shifts incorrectly (incorrect shift pattern).
POSSIBLE CAUSE
•  There is a malfunction in the signal circuit which controls shifting (APP sensor, input/turbine speed sensor, VSS), the control valve is stuck, the accumulator (forward or servo apply) is stuck, or the clutch circuit is stuck.
1.  Clutch slipped, burnt
•  Line pressure low
•  Shift solenoid A malfunction
•  Shift solenoid B malfunction
•  Shift solenoid C malfunction
•  Shift solenoid D malfunction
•  Shift solenoid E malfunction
•  Control valve body malfunction
•  APP sensor malfunction
•  Body GND malfunction
2.  Signal malfunction
•  APP sensor malfunction
•  Input/turbine speed sensor malfunction
•  VSS malfunction
•  Sensor GND malfunction
3.  TR switch malfunction
•  Selector cable adjustment incorrect
•  TR switch adjustment incorrect
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
Disconnect the PCM connector.
Measure the resistance between ground terminal at the PCM connector and body ground.
Is the resistance less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
2
Inspect the following PID values using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
•  APP
•  TSS
•  VSS
Are the PID values normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
If any problem remains:
•  Overhaul the transaxle and repair or replace any malfunctioning parts.
No
Repair or replace any malfunctioning parts.
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 PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)