Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING
Diagnostic procedure
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
NGS tester.
(See F1-25 PCM INSPECTION.)
• TPV
• VS
• TSS/ISS
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 £2? Yes Go to next step.
No Repair open ground circuit.
4 Check resistance between TCC control circuit at
PCM connector and control valve body connector.
Check resistance between TCC circuit at PCM
connector and control valve body connector.
Are the resistances less than 5.0 £2?
Yes
Go to next step.
No Repair TCC control or TCC circuit.
Reconnect PCM.
5 Inspect TCC control solenoid valve and TCC
solenoid valve.
(See K2-38 SOLENOID VALVE INSPECTION.)
Are the solenoid valves operating properly?
Yes Replace PCM.
No Overhaul control valve body and repair or replace any
defective parts.
(See ATX workshop manual (FN4A-EL) [1623-10-98E].)
If problem remains, overhaul transaxle and repair or
replace any defective parts.
(See ATX workshop manual (FN4A-EL) [1623-10-98E].)
N0.13 NO KICKDOWN
13 No kickdown
DESCRIPTION
• Does not downshift when accelerator pedal is fully depressed within kickdown range.
POSSIBLE
CAUSE
• If the transaxle does not downshift though shifting is normal, the malfunction is in the TP sensor circuit
(including the sensor GND, sensor harness and connector).
NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING
14 Engine flares up or slips when upshifting or downshifting
DESCRIPTION
• When accelerator pedal is depressed for driveway, engine speed increases but vehicle speed increases
slowly.
• When accelerator pedal is depressed while driving, engine speed increases but vehicle does not.
POSSIBLE
CAUSE
• There is clutch slip because the clutch is stuck or the line pressure and clutch pressure is low.
1 .Clutch stuck, slippage (forward clutch, 3— 4 clutch, 2— 4 brake band, one-way clutch)
• Line pressure low • Shift solenoid A malfunction
• TP sensor malfunction or misadjustment • Shift solenoid B malfunction
• Vehicle speed sensor malfunction • Shift solenoid C malfunction
• input/turbine speed sensor malfunction • Pressure control solenoid malfunction
• Sensor
GND
malfunction • Body
GND
malfunction
• Shift solenoid D malfunction • Accelerator cable misadjustment
• Shift solenoid E malfunction • Control valve body malfunction
2. Poor operation of mechanical pressure
• Selector lever position disparity • TR switch position disparity
K2-147