Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
16 SHIFT CONCERNS: SOFT/SLIPPING 1 -2 SHIFT
[TROUBLESHOOTING HINTS]
• Powertrain control system • Forward clutch component
• Control valve body • Low OWC component
• 2/4 Band and servo component • Low/reverse clutch component
• Forward OWC component • Transaxle case
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 fluid temperature (TFT) sensor
a- 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test
Perform pinpoint tests “BA, BB, BC, BD, BE, BF and E”
c r 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
• Gaskets are damaged
• 2/4 accumulator piston plug and seal (also
soft 3 -4 shift), are main regulator valve,
line modulator valve (also soft 3 -4 shift)
stuck, damaged, or misassembled
• Hydraulic passages are damaged
• Pressure tap plate/gasket is damaged
• Separator plates are damaged
Yes
Service as required
No Go to next step
3
2/4 band and servo component
• Do any of the following problems exist?
• Piston seals or piston bore are damaged,
or missing
• Servo rod or rod bore is damaged
• 2/4 band and/or reverse clutch drum
component are worn, damaged, or
misassembled
• Springs are damaged
• Servo cover and seal are damaged
Yes Service as required
No Go to next step
4
Forward OWC component (Slips in first
gear)
• Is the forward OWC component damaged
or not holding?
Yes Service as required
No Go to next step
5
Forward clutch component (Slip in first
gear)
• Do any of the following problems exist?
• Seals are damaged
• Return spring is damaged
• Friction elements are damaged
• Pump support seals #3, #4 are damaged
Yes Service as required
No Go to next step
6
Low OWC component
• Is the low OWC component damaged or
not overrunning?
Yes
Service as required
No Go to next step
7
Low/reverse clutch component
• Is there severe friction damage?
Yes
Service as required
No Go to next step
8 Transaxle case
• Do any of the following problems exist?
• Band anchor is damaged
• Porosity/leakage in servo apply/servo
release circuits
Yes
Service as required
No The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
v
0 1 -0 1 A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
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