Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
23 SHIFT CONCERNS: HARSH 2 -3 SHIFT
[TROUBLESHOOTING HINTS]
• Powertrain control system • Direct clutch component
• Control valve body • 2/4 servo
• 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
• Transaxle range (TR) switch
• Vehicle speedometer sensor (VSS)
• Transaxle fluid temperature (TFT) sensor
• Mass air flow (MAF) sensor
• TCC solenoid
• Turbine shaft speed (TSS) sensor
d
- 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,
and F”
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 following problems exist?
• Bolts are not torqued to specification
• Gasket leaks
• Line modulator valve (also 1 -2 and 3 -4
harsh shift), servo release shuttle valve are
stuck, damaged, or misassembled
• Separator plates are damaged
• Hydraulic passages are damaged
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
• Pump support seal rings #4 and #5 are
damaged
Yes
Service as required
No Go to next step
4 Direct clutch component
• Do any of the following problems exist?
• Piston or piston bore is damaged
• Friction elements are damaged, or worn
• Check ball is not seating properly
• Return spring component is damaged
• Forward/coasting/direct (F/C/D) clutch
cylinder splines are damaged
Yes Service as required
No
Go to next step
5 2/4 Band Servo
• Do any of the following problems exist?
• Piston or piston bore is damaged
• Servo rod is damaged
Yes Service as required
No Go to next step
6 Transaxle Case
• Do any of the following problems exist?
• Leakage in the servo apply, servo release,
or direct clutch circuits
• Servo rod bore is damaged
Yes Service as required
No The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
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* 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
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