Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
20
SHIFT CONCERNS: SOFT/SLIPPING 3 -2 SHIFT (AUTOMATIC)
[TROUBLESHOOTING HINTS]
• Powertrain control system • 2/4 band and servo component
• Control valve body • Direct clutch component
• Oil pump • 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
• Throttle position (TP) sensor
• Vehicle speedometer sensor (VSS)
• MAF
• 3 -2 timing/coasting clutch solenoid
(3-2T/CC S)
o - 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test
Perform pinpoint tests “E and G”
or 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 is damaged
• 3 -2 Timing valve, solenoid regulator valve,
3 -2 control valve are stuck, damaged, or
misassembled
• 3-2T/C C S solenoid malfunction
• Pressure tap plate/gasket leaks, or
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
• Gaskets are damaged
• Porosity/cross leaks
• Pump support seal Rings #4, 5, 6 are
damaged, or misassembled
• Forward to direct passage leaks
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 are damaged
• Servo return and cushion springs are
damaged, or misassembled
• Springs are damaged, or misassembled
• Servo rod is bent, or damaged
Yes Service as required
No
Go to next step
5
Direct clutch component
• Do any of the following problems exist?
• Return spring is damaged, or broken
• Friction elements is damaged, or worn
• Check ball is not releasing
• Piston or seal is damaged
Yes Service as required
No
Go to next step
6
Transaxle case
• Do any of the following problems exist?
• Band anchor is damaged
• Leakage in the servo apply/release circuits
• Case bore is damaged (Servo Rod)
Yes
Service as required
No
The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
c r 0 1 -0 1 A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
0 5 -0 1 A -5 7