Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
24 SHIFT CONCERNS: HARSH 3 -4 SHIFT
[TROUBLESHOOTING HINTS]
• Powertrain control system • Coasting clutch component
• Control valve body • Direct clutch component
• Oil pump • Transaxle case
• 2/4 band and servo component
STEP
INSPECTION ACTION
1 Powertrain control system
• Are there any problems with the following?
• Electrical input/output
• Vehicle wiring harness
• PCM
• Electrical pressure control (EPC) solenoid
• Transaxle range (TR) switch
• Vehicle speedometer sensor (VSS)
• 3 -2 timing/coasting clutch solenoid
(3-2T/CC S)
• Transaxle fluid temperature (TFT) sensor
• Turbine shaft speed (TSS) sensor
• Throttle position (TP) sensor
• Mass air flow (MAF) sensor
• TCC solenoid
c r 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test -
Perform pinpoint tests “BA, BB, BC, BD, BE, BF, C, D, E,
F, and G”
V 0 5 -0 1 A AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSIS [LA4A-EL], Pinpoint Test
No Go to next step
2 Control valve body
• Do any of the following problems exist?
• Bolts are not torqued to specification
• Gasket leaks
• Line modulator valve (also harsh 1 -2 and
2 -3 shifts), 3 -2 control valve, 2/4
accumulator valve, coasting clutch valve
are stuck, damaged, or misassembled
• Hydraulic passages are damaged
• Separator plates are damaged, or blocked
Yes Service as required
No Go to next step
3 Oil pump
• Do any of the following problems exist?
• Bolts are not torqued to specification
• Gasket is damaged
• Porosity/cross leaks
• Coasting clutch teflon seals are damaged
Yes Service as required
No Go to next step
4 2/4 band and servo component
• Do any of the following problems exist?
• 2/4 band and/or reverse clutch drum
component are damaged, worn, or
misassembled
• Servo piston or cover is damaged, or
leaking
• Springs are damaged
Yes Service as required
No Go to next step
5 Coasting clutch component
• Do any of the following problems exist?
• Piston or seals are damaged, or missing
• Friction is damaged, or worn
• Check ball is not functioning
Yes Service as required
No Go to next step
6 Direct clutch component
• Do any of the following problems exist?
• Piston or seals are damaged, or missing
• Check ball damaged, missing, or leaking
• Return spring is damaged
• Friction elements are damaged
• F/C/D clutch cylinder splines are damaged
Yes Service as required
No
Go to next step
7
Transaxle Case
• Is the band anchor damaged?
Yes Service as required
No
The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
D- 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
0 5 -0 1 A -61