Mazda 6 2002 Workshop Manual page 497

NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION
12 Torque converter clutch (TCC) non-operation
DESCRIPTION • TCC does not operate when vehicle reaches TCC operation range.
• Basically, the TCC does not operate when the fail-safe is operating. Verify the DTC first.
Caution
• • • • If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which
1. TCC burned
(1) Input sensor system malfunction
• Transale fluid temperature sensor
• Vehicle speed sensor
• Input/turbine speed sensor
• Sensor GND
POSSIBLE (2) Output solenoid valve system malfunction (Sticking)
CAUSE • Shift solenoid E malfunction
• Shift solenoid A malfunction
(3) Control valve body malfunction system (Poor operation, stuck)
• TCC hydraulic pressure system
2. TP sensor malfunction (Not operating linear)
3. Input/turbine speed sensor or vehicle speed sensor malfunction
4. Brake switch malfunction (Always ON)
5. ECT sensor 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 With indicator switch at ON, does HOLD
indicator light indication correspond to HOLD
switch operation?
2 Check the value at the following PIDs using the
WDS or equivalent. (See
INSPECTION.)
• TP
• VSS
• TSS
Are PID values okay?
3 Disconnect PCM.
Is resistance between ground terminal at PCM
connector and body ground less than 5.0
ohms?
4 Check resistance between shift solenoid A and
E control circuit at PCM connector and control
valve body connector. Check resistance
between shift solenoid A and E circuit at PCM
connector and control valve body connector. Are
the resistances less than 5.0 ohms?
5 Inspect shift solenoid A and E. (See
SOLENOID VALVE
solenoids operating properly?
End Of Sie
NO.13 NO KICKDOWN
13 No kickdown
DESCRIPTION • Does not downshift when accelerator pedal is fully depressed within kickdown range.
POSSIBLE • If transale does not downshift though shifting is normal, malfunction is in TP sensor circuit (including
CAUSE sensor GND, sensor harness and connector).
TROUBLESHOOTING
may have mied in with the ATF.
INSPECTION
F–45 PCM
K–26
INSPECTION.) Are the shift
Yes Go to net step.
No Go to No.26 "HOLD INDICATOR LIGHT DOES NOT
ILLUMINATE WHEN HOLD SWITCH IS TURNED ON.",
No.27 "HOLD INDICATOR LIGHT ILLUMINATES WHEN
HOLD SWITCH IS NOT TURNED ON."
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 or E control. Reconnect PCM.
Yes Replace PCM.
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].)
A6E568001030W16
ACTION
A6E568001030W17
K–123
K