Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
17
SHIFT CONCERNS: SOFT/SLIPPING 2 -3 SHIFT
[TROUBLESHOOTING HINTS]
• Powertrain control system • 2/4 servo
• Control valve body • Forward OWC component
• Oil pump • Transaxle case
• Direct clutch 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 fluid temperature (TFT) sensor
o - 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test
Perform pinpoint tests “BA, BB, BC, BD, BE, BF and D”
&■ 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 soft 1 -2 and
3 -4 shifts), servo release shuttle valve are
stuck, damaged, or misassembled
• Hydraulic passages are damaged
• Separator plates are damaged
• Pressure tap plate/gasket leaks
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
• Gaskets are damaged
• Pump support seals #4 and #5 are
damaged, or missing
Yes Service as required
No Go to next step
4
Direct clutch component
• Do any of the following problems exist?
• Seals or piston are damaged
• Piston bore is damaged
• Friction is damaged, worn, or excessive
end clearance
• Check ball is not seating properly
• Return spring component is damaged
Yes Service as required
No
Go to next step
5 2/4 Servo
• Do any of the following problems exist?
• Piston or piston bore is damaged
• Servo rod or rod bore is damaged
Yes Service as required
No Go to next step
6 Forward OWC component
• Is the forward OWC component damaged
or not holding
Yes Service as required
No Go to next step
7 Transaxle case
• Do any of the following problems exist?
• Leakage in the servo apply, servo release
or direct clutch circuits
Yes Service as required
No The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
a- 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
05-01A-54