NO.9 ABNORMAL SHIFTING [FS5A-EL]

id050308801400

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 slippage, burnt

•  Line pressure low

•  Shift solenoid A malfunction

•  Shift solenoid B malfunction

•  Shift solenoid C malfunction

•  Shift solenoid D malfunction

•  Shift solenoid E malfunction

•  Shift solenoid F malfunction

•  Pressure control solenoid B malfunction

•  Control valve body 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 lever adjustment incorrect

•  TR switch adjustment incorrect

4.  Wheel speed signal malfunction

•  Tire of a different diameter from the standard tire is installed

•  ABS wheel-speed sensor malfunction

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].)

•  If a tire of a different diameter from the standard tire is installed, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Verify tire condition. • Inspect the tire size and air pressure. • Is the tire of specified size and air pressure?	Yes	Go to the next step.
1		No	Replace with a specified tire size or adjust the air pressure of each specified tire to the specified value.
2	Inspect the vehicle wheel speed signal. • Display the following ABS CM or DSC CM PIDs using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) ― WSPD_LF ― WSPD_LR ― WSPD_RF ― WSPD_RR • Are the monitoring values displayed uniformly while driving?	Yes	Go to the next step.
2		No	Perform the following inspections: • ABS wheel-speed sensor installation inspection ― Is the ABS wheel-speed sensor installation normal? • ABS sensor rotor installation inspection ― Is the ABS sensor rotor installed twisted? (may cause output of abnormal wave pattern at high speeds.) ― Are there missing teeth on the sensor rotor? If there is any malfunction, repair or replace the malfunctioning location.
3	Disconnect the TCM connector. Measure the resistance between ground terminal at the TCM connector and body ground. Is the resistance less than 5.0 ohms?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness for a possible open circuit.
4	Inspect the following PCM and TCM PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0, MZR 2.5].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].) PCM PID: • APP TCM PIDs: • THOP • TSS • OSS • VSS Are the PID values normal? (See PCM INSPECTION [MZR 2.0, MZR 2.5].)	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
4		No	Repair or replace any malfunctioning parts.
5	• 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. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)