Specifications

TROUBLESHOOTING
K123
K
NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION
A6E568001030W16
Diagnostic procedure
End Of Sie
NO.13 NO KICKDOWN
A6E568001030W17
12 Torque converter clutch (TCC) non-operation
DESCRIPTION • TCC does not operate when vehicle reaches TCC operation range.
POSSIBLE
CAUSE
• 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
may have mixed in with the ATF.
1. TCC burned
(1) Input sensor system malfunction
• Transaxle fluid temperature sensor
• Vehicle speed sensor
• Input/turbine speed sensor
• Sensor GND
(2) Output solenoid valve system malfunction (Sticking)
• 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 Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 With indicator switch at ON, does HOLD
indicator light indication correspond to HOLD
switch operation?
Yes Go to next 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."
2 Check the value at the following PIDs using the
WDS or equivalent. (See F45 PCM
INSPECTION.)
• TP
• VSS
• TSS
Are PID values okay?
Yes Go to next step.
No Repair or replace any defective parts.
3 Disconnect PCM.
Is resistance between ground terminal at PCM
connector and body ground less than 5.0
ohms?
Yes Go to next step.
No Repair open ground circuit.
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?
Yes Go to next step.
No Repair shift solenoid A or E control. Reconnect PCM.
5 Inspect shift solenoid A and E. (See K26
SOLENOID VALVE INSPECTION.) Are the shift
solenoids operating properly?
Yes Replace PCM.
No Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle 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].)
13 No kickdown
DESCRIPTION • Does not downshift when accelerator pedal is fully depressed within kickdown range.
POSSIBLE
CAUSE
• If transaxle does not downshift though shifting is normal, malfunction is in TP sensor circuit (including
sensor GND, sensor harness and connector).