Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING
IN0.6 LOW MAXIMUM SPEED AND POOR ACCELERATION
6
Low maximum speed and poor acceleration
DESCRIPTION
• Vehicle acceleration is poor at start.
• Delayed acceleration when accelerator pedal is depressed while driving.
POSSIBLE
CAUSE
• If the clutch is stuck or does not stay in 3GR, the malfunction is in the engine circuit.
1 . Clutch slippage, burned
• Line pressure low • Shift solenoid A malfunction
• TP sensor malfunction • 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 • Control valve body malfunction
• Shift solenoid E malfunction
2. Transaxle fixed in 3GR (Operation of fail-safe function)
• Short or open circuit in wiring • The electronic parts of output and input
• Poor connection of connector system is malfunction
3. Insufficient starting torque (Suspected when in-gear condition, shift control and engine circuit are normal)
• The torque converter is malfunction (Poor operation, stuck)
4. Engagement of TCC operation range (Operation of fail-safe function)
• Transaxle fluid temperature sensor malfunction (Short or open circuit)
Diagnostic procedure
STEP INSPECTION ACTION
1
With ignition 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 Go to No. 11 “Lack/loss of power”.
(See F1-125 No.11 LACK/LOSS OF
POWER-ACCELERATION/CRUISE.)
Does CIS system okay?
Yes Go to next step.
No Repair or replace any defective parts.
3 Disconnect solenoid connector.
Does vehicle operate as follows?
D, S ranges: 3GR (fixed)
L range: 1 GR (fixed)
R position: Reverse
Yes Go to next step.
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])
4
Drive vehicle in D, S, and L ranges except HOLD
mode. Does vehicle start from stop in first gear? Yes Go to next step.
No Check the value at the following PIDs using the NGS
tester.
(See F1-25 PCM INSPECTION.)
• TP V
• VSS
• TURBINE
• TR
Repair or replace any defective parts.
5 Check the value at the following PIDs using the
NGS tester.
(See F1-25 PCM INSPECTION.)
• SHIFT A
• SHIFT B
• SHIFT C
Are PID values okay?
Yes Go to next step.
No Check the value at the following PIDs using the NGS
tester.
(See F1-25 PCM INSPECTION.)
• TP V
• VSS
• TSS/ISS
Repair or replace any defective parts.
6 Perform the stall test.
(See K2-22 MECHANICAL SYSTEM TEST, Stall
Test.)
Is stall speed okay?
Yes Reverify symptoms of malfunction.
No Overhaul transaxle and repair or replace any defective
parts.
(See ATX workshop manual (FN4A-EL) [1623-10-98E].)
K 2-143