Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
STEP INSPECTION
ACTION
9
Reverse/fourth (REV/4GR) carrier
component
• Is there any damage?
Yes Service as required
No
Go to next step
10 Transaxle case
• Is there any severe cross leakage from the
reverse clutch to low/reverse clutch feeds?
Yes Service as required
No The problem is fixed
3 HARSH ENGAGEMENT
[TROUBLESHOOTING HINTS]
• ATF • Joint shafts
• Powertrain control system • Engine mounts
• Improper pressure • Forward clutch component (Forward only)
• Control valve body • Reverse clutch component (Reverse only)
• Oil filter and seal • Low/reverse clutch component (Reverse only)
• Internal and external linkages • Direct clutch component (Reverse only)
STEP
INSPECTION ACTION
1
ATF
• Are there any problems with the following?
• Level
• Condition
c r 0 5 -1 7A AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION [LA4A-EL]
Yes
Service as required
No Go to next step
2 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
• 3 -2 timing/coasting clutch solenoid (3-2
T/CCS) (Harsh forward only)
c r 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENTS [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
3 Improper pressure
• Is line pressure higher than normal?
c r 0 5 -1 7A MECHANICAL SYSTEM TEST
[LA4A-EL], Line Pressure Test
Yes Verify engagements at minimum EPC using the transaxle
tester
If line remains high, check the following components:
control valve body, oil filter and seal component
No Go to next step
4
Control valve body
• Do any of the following problems exist?
• Bolts are not torqued to specification
• Gaskets are damaged
• Low/reverse accumulator piston and spring
(Reverse), main regulator valve, coast
clutch valve (Forward) are damaged,
missing stuck, or misassembled
• Accumulator piston and spring are
misassembled, stuck, or damaged
• EPC solenoid is stuck, or damaged
Yes Service as required
No Go to next step
5
Oil Filter and seal component
• Do any of the following problems exist?
• Filter/seal are damaged, or plugged
• Recirculation seal is damaged, plugged, or
out of position
Yes Replace as required
No Go to next step
6 Internal or external shift linkages
• Do any of the following problems exist?
• Damaged
• Misadjusted
c r 0 5 -1 8 SELECTOR LEVER
REMOVAL/INSTALLATION
Yes
Service as required
No Go to next step
7 Joint shafts
• Is there spline damage?
c r 0 5 -1 7A AUTOMATIC TRANSAXLE
REMOVAL/INSTALLATION [LA4A-EL]
Yes Service as required
No Go to next step
0 5 -0 1 A -3 9