Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
33
OTHER: NO ENGINE BRAKING IN FIRST GEAR (“ 1” RANGE)
[TROUBLESHOOTING HINTS]
• Powertrain control system
• Coasting clutch component
• Control valve body • Low/reverse clutch component
• Oil pump
STEP INSPECTION
ACTION
1 Powertrain control system
• Are there any problems with the following?
• Electrical input/output
• Vehicle wiring harness
• PCM
• 3 -2 timing/coasting clutch solenoid
(3-2T/CCS)
cr 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test
Perform pinpoint tests “G”
r r 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
• Gaskets are damaged
• Low/reverse modulator valve, coasting
clutch valve are stuck damaged, or
misassembled
• 3-2T/C C S is stuck, or damaged
• Hydraulic passages are damaged
• Pressure tap plate/gasket is damaged
• Separator plate/gasket is damaged
Yes
Service as required
No Go to next step
3 Oil pump
• Do any of the following problems exist?
• Pump support seal rings #2 and #3 for the
coast clutch circuit are or damaged,
missing
Yes Service as required
No
Go to next step
4 Coasting clutch component
• Do any of the following problems exist?
• Assembly misassembled, or damaged
• Forward clutch hub seal is damaged
• Piston or seals are damaged
• Check ball is damaged, or missing
Yes Service as required
No Go to next step
5
Low/reverse clutch component
• Do any of the following problems exist?
• Misassembled
• Damaged
• Piston or seals are damaged
Yes Service as required
No The problem is fixed
34 OTHER: NO ENGINE BRAKING IN “2 ” RANGE
[TROUBLESHOOTING HINTS]
• Powertrain control system
• Internal or external shift linkages
• Control valve body • Oil pump
• Forward one-way clutch (OWC) component
• Coasting clutch component
STEP
INSPECTION ACTION
1 Powertrain control system
•
Are there any problems with the following?
• Electrical inputs/outputs
• Vehicle wiring harness
• PCM
• 3-2T/C C S
cp
0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD tests
Perform pinpoint tests “G”
c r
0 5 -0 1 A AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSIS [LA4A-EL], Pinpoint Test
No Go to next step
0 5 -0 1 A -6 8