Mazda 6 2002 Workshop Manual page 499

NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION
16 Judder upon torque converter clutch (TCC) operation
DESCRIPTION • Vehicle jolts when TCC is engaged.
• Poor TCC engagement due to either slippage because the TCC is stuck or the line pressure is low
Caution
• • • • If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which
1. Torque converter clutch piston slipped, burned
• Line pressure high
• Shift solenoid A malfunction
• Control valve body malfunction
• Body GND malfunction
POSSIBLE • Pressure control solenoid malfunction
CAUSE 2. Signal malfunction
• Vehicle speed sensor malfunction
• Sensor GND malfunction
• TFT sensor malfunction
• TP sensor malfunction or mis-adjustment
• Input/turbine speed sensor malfunction
3. Torque converter malfunction
Note
• Before following troubleshooting steps, make sure that Automatic Transale On-Board Diagnostic
and Automatic Transale Basic Inspection are conducted.
Diagnostic procedure
STEP
1 Check the value at the following PIDs using the
WDS or equivalent. (See
INSPECTION.)
• TSS
Are PID values okay?
2 Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?
3 Check resistance between shift solenoid A
control circuit at PCM connector and control
valve body connector. Check resistance
between shift solenoid A circuit at PCM
connector and control valve body connector. Are
the resistance less than 5.0 ohms?
4 Inspect Shfit solenoid. (See
VALVE INSPECTION.) Is the solenoid valve
operating properly?
5 Check LPS PID value.
Is LPS PID value okay?
(See F–45 PCM INSPECTION.)
End Of Sie
TROUBLESHOOTING
may have mied in with the ATF.
INSPECTION
F–45 PCM
K–26 SOLENOID
Yes Go to net step.
No Repair or replace any defective parts.
Yes Go to net step.
No Repair open ground circuit.
Yes Go to net step.
No Repair shift solenoid A circuit.
Yes Go to net step.
No Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transale and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)
Yes Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transale and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)
No Replace PCM.
A6E568001030W20
ACTION
K–125
K