Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
13 SHIFT CONCERNS: NO 1 -2 SHIFT
[TROUBLESHOOTING HINTS]
• Powertrain control system • Low OWC component
• Improper pressure • Reverse/fourth gear (REV/4GR) sun gear and shell
• Control valve body • Transaxle case
• 2/4 band and servo
STEP INSPECTION
ACTION
1 Powertrain control system
• Do any of the following problems exist?
• Electrical input/output
• Vehicle wiring harness
• PCM
• Shift solenoid No.1 (SS1), Shift solenoid
No.2 (SS2)
• Transaxle range (TR) switch
v 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD test
Perform pinpoint tests “A and D”
c r 0 5 -0 1 A AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSIS [LA4A-EL], Pinpoint Test
No Go to next step
2 Improper pressure
• Do any of the following problems exist?
• High line pressure
• Low line pressure
c r 0 5 -1 7A MECHANICAL SYSTEM TEST
[LA4A-EL], Line Pressure Test
Yes Go to next step
No Go to step 4
3 Control valve body
• Do any of the following problems exist?
• Bolts are not torqued to specification
• Gaskets are damaged
• 1 -2 shift valve, 2/4 accumulator, main
regulator valve are stuck, damaged, or
misassembled
• SS1, SS2 malfunction
• Pressure tap plate/gasket are damaged
• Separator plates are damaged
• Hydraulic passages are damaged
Yes Service as required
No Go to next step
4 2/4 band and servo component
Note
• Also no fourth gear
• Do any of the following problems exist?
• Seals are damaged, or missing
• Piston is damaged
• Band is damaged, worn
• Springs are damaged
• Servo rod or rod bore is damaged
Yes Service as required
No Go to next step
5
Low OWC component
• Is there damaged?
Yes Service as required
No Go to next step
6 Reverse/fourth gear sun gear and shell
• Do any of the following problems exist?
• Damaged, or weld broken
• Lugs are damaged
Yes Service as required
No Go to next step
7
Transaxle case
• Do any of the following problem exist?
• Band anchor area is damaged
• Porosity/leakage In servo apply, servo
release circuits
Yes Service or replace case as required
No The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
c r 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
0 5 -0 1 A -5 0