Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [GF4A-EL]
6
LOW MAXIMUM SPEED AND POOR ACCELERATION
TROUBLESHOOTING HINTS
If the clutch is stuck or does not stay in third or fourth gear, the malfunction is in the engine circuit.
© Clutch slippage, burned
• Line pressure low
• Malfunction of throttle position sensor
• Malfunction of vehicle speedometer sensor
• Malfunction of input/turbine speed sensor
• Malfunction of sensor ground
• Malfunction of shift solenoid A (Sticking)
• Malfunction of shift solenoid B (Sticking)
• Malfunction of shift solenoid C (Sticking)
• Malfunction of pressure control solenoid valve (Sticking)
• Malfunction of body ground (Sticking)
• Malfunction of control valve body system
© T ra n s a x le fixed in 3GR (Operation of fail-safe function)
• Short or open circuit in wiring
• Poor connection of connector
• The electronic parts of output and input system is malfunction
© Insufficient starting torque (Suspected when in-gear condition, shift control, and engine circuit are normal)
• The torque converter is malfunction (Poor operation, sticking)
@ Enlargement of TCC operation range (Operation of fail-safe function)
• Malfunction of TFT sensor (Short or open circuit)
STEP INSPECTION
ACTION
1 With ignition switch at ON, does O/D OFF
indicator light indication correspond to O/D
OFF switch operation?
Yes Go to next step
No Go to No.26 “O/D OFF INDICATOR LIGHT DOES NOT
ILLUMINATE WHEN O/D OFF SWITCH IS TURNED ON”,
No.27 “O/D OFF INDICATOR LIGHT ILLUMINATES
WHEN O/D OFF SWITCH IS NOT TURNED ON”
2 Go to No. 13 “Poor fuel economy”
i t
0 1 -0 1 B ENGINE SYMPTOM
TROUBLESHOOTING [KL]
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 range — 3GR (fixed)
2 range — 2GR (fixed)
1 range — 1GR (fixed)
R position
— Reverse
Yes Go to next step
No Overhaul control valve body and repair or replace any
defective parts
o* ATX workshop manual
If problem remains, overhaul transaxle and repair or
replace any defective parts
c r ATX workshop manual
4 Drive vehicle in D, 2, and 1 ranges (O/D off
switch OFF) does vehicle start from stop in
first gear?
Yes
Go to next step
No Check the voltage at the following terminals of the
powertrain control module
i t
01-40B POWERTRAIN CONTROL MODULE (PCM)
INSPECTION [KL]
• Throttle position sensor signal
• Vehicle speedometer sensor signal
• Input/turbine speed sensor
• D, 2 ,1 range signals
Repair or replace any defective parts
5
Check the voltage at the following terminals of
the powertrain control module
o» 01-40B POWERTRAIN CONTROL
MODULE (PCM) INSPECTION [KL]
• Shift solenoid A signal
• Shift solenoid B signal
• Shift solenoid C signal
Are terminal voltages okay?
Yes Go to next step
No Check the voltage at the following terminals of the
powertrain control module
tr 01-40B POWERTRAIN CONTROL MODULE (PCM)
INSPECTION [KL]
• Throttle position sensor signal
• Input/turbine speed sensor
• Vehicle speedometer sensor signal
Repair or replace any defective parts
6 Perform the stall test
c r 0 5 -1 7B MECHANICAL SYSTEM TEST
[GF4A-EL], Stall Test
Is stall speed okay?
Yes Reverify symptoms of malfunction
No
Overhaul transaxle and repair or replace any defective
parts
o - ATX workshop manual
0 5 -0 1 B -2 8