Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING
N0.10 FREQUENT SHIFTING
10 Frequent shifting
DESCRIPTION
• Downshifting occurs immediately even when accelerator pedal is depressed slightly in D, S, L ranges
non-HOLD mode.
POSSIBLE
CAUSE
• The circuit which is the cause is basically the same as for No.9 “Abnormal shift”. However, a malfunction
of the input signal to the TP sensor, input/turbine speed sensor, vehicle speed sensor (Including the
sensor GND, sensor harness and connector), or clutch slippage (clutch stuck, low pressure in line) may
also be the cause.
NO.11 SHIFT POINT IS HIGH OR LOW
11 Shift point Is high or low
DESCRIPTION
• Shift point is considerably different from automatic shift diagram.
Shift delayed when accelerating.
• Shift occurs quickly when accelerating and engine speed does not increase.
POSSIBLE
CAUSE
• If the transaxle does not shift abnormally, there is a malfunction of the input signal to the TP sensor,
input/turbine speed sensor, or vehicle speed sensor.
• If the engine speed is high or low, regardless normal shifting, inspect the tachometer.
• Verify that the output signal of the TP sensor changes linearly.
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.
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
© Input sensor system malfunction
• Transaxle fluid temperature sensor • Input/turbine speed sensor
• Vehicle speed sensor • Sensor GND
© Output solenoid valve system malfunction (Stuck)
• Shift solenoid D malfunction • Shift solenoid A malfunction
• Shift solenoid E malfunction
(D 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
K 2-146