NO.9 ABNORMAL SHIFTING [SJ6A-EL]

id050307801400

9 | Abnormal shifting
DESCRIPTION | • Shift incorrectly (incorrect shift pattern).
POSSIBLE CAUSE | • There is a malfunction in the signal circuit which controls shifting (Throttle position signal, turbine sensor, VSS), the control valve is stuck, or the clutch circuit is stuck. ― Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake) • Line pressure low • Incorrect throttle position signal • Incorrect accelerator pedal position signal • Incorrect engine speed signal • Incorrect engine coolant temperature signal • Incorrect engine torque signal • VSS malfunction • Turbine sensor malfunction • Sensor GND malfunction • TFT sensor malfunction • Line pressure control solenoid malfunction • Body GND malfunction • Control valve body malfunction • TCM malfunction ― 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 Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-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.
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 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.
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 | • Inspect for continuity between the TCM terminal 1P, 1X and battery negative terminal. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the suspected wiring harness.
4 | • Is the line pressure normal? (See MECHANICAL SYSTEM TEST [SJ6A-EL].) | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
5 | • Access the following PCM and TCM PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) (See PID/DATA MONITOR INSPECTION [SJ6A-EL].) PCM PIDs: ― RPM ― APP ― TP ― ECT TCM PIDs: ― VSS ― TSS • Are the PIDs value normal? (See PCM INSPECTION [L8, LF].) (See PID/DATA MONITOR INSPECTION [SJ6A-EL].) | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
6 | • Inspect the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].) • Is the TFT sensor normal? | Yes | Go to the next step.
No | Replace the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION [SJ6A-EL].)
7 | • Inspect the line pressure control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the line pressure control solenoid normal? | Yes | Inspect the TCM terminal for bend, damage, corrosion or poor contact.
No | Inspect the coupler component. • If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
8 | • Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)