Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
25
SHIFT CONCERNS: HARSH 4 -3 SHIFT (AUTOMATIC)
[TROUBLESHOOTING HINTS]
• Powertrain control system • 2/4 band and servo component
• Control valve body • Coasting 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
• Transaxle range (TR) switch
• Vehicle speedometer sensor (VSS)
• Throttle position (TP) sensor
• Transaxle fluid temperature (TFT) sensor
• Mass air flow (MAF) sensor
• Turbine shaft speed (TSS) sensor
• 3 -2 timing/coasting clutch solenoid
(3-2T/CCS)
• TCC solenoid
trr 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”
i t
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
• Servo release shutter valve, 3 -2
timing/coast 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
• Porosity/cross leaks, seal rings are
damaged, missing or ball plug is leaking
• Gasket damaged
• Pump support seal rings #2, 3,
4, and #5
(Coast and direct circuits) 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?
• Servo rod is bent, or damaged
• Servo return spring is broken
Yes
Service as required
No Go to next step
5
Coasting clutch component
• Do any of the following problems exist?
• Seals are damaged, or missing
• Piston is damaged
• Friction elements are worn, or damaged
• Check ball is not functioning
• Forward clutch piston and return spring are
damaged
Yes Service as required
No Go to next step
6
Transaxle Case
• Do any of the following problems exist?
• Porosity/cross leaks in servo apply, servo
release, direct clutch, coasting clutch
circuits
Yes Service as required
NO
The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
ty 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
0 5 -0 1 A -6 2