Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [LA4A-EL]
STEP INSPECTION ACTION
Speed input
• Is the vehicle speedometer sensor drive
gear damaged?
Yes
No
Service as required
For further diagnosis, refer to the appropriate shift
routine(s):
Shift No shift
1-2 13
2 -3 14
3 -4
15
W6U501WAE
7 SHIFT CONCERN: TIMING — EARLY/LATE
[TROUBLESHOOTING HINTS]
• Powertrain control system • Speed input
• Tire size
STEP INSPECTION ACTION
1 Powertrain control system
• Are there any problems with the following?
• Electrical input/output
• Vehicle wiring harness
• PCM
• Throttle position (TP) sensor
• Vehicle speedometer sensor (VSS)
• Transaxle fluid temperature (TFT) sensor
cr
0 5 -1 7A MECHANICAL SYSTEM TEST
[LA4A-EL], Line Pressure Test
Yes Run OBD test
Perform Pinpoint Test “BA, BB, BC, BD, BE, BF”
cr 0 5 -0 1 A AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSIS [LA4A-EL], Pinpoint Test
No Go to next step
2 Possible components
• Do any of the following problems exist?
• Tire size change
• Vehicle speedometer sensor drive gear is
damaged
Yes Service as required
No
The problem is not in the automatic transaxle
Go to engine symptom troubleshooting
d
- 01-01A ENGINE SYMPTOM TROUBLESHOOTING
[FS]
8
SHIFT CONCERN: ERRATIC
[TROUBLESHOOTING HINTS]
• ATF
• Powertrain control system
• Vehicle speed input
• Control valve body
STEP INSPECTION
ACTION
1 ATF
• Are there any problems with the
followings?
• Level
• Condition
cr 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
• Shift solenoid No. 1 (SS1), Shift solenoid
No.2 (SS2)
• Transaxle range (TR) switch
• Brake switch
• TCC solenoid
• Vehicle speedometer sensor (VSS)
• Throttle position (TP) sensor
• Turbine shaft speed (TSS) sensor
• Electrical pressure control (EPC) solenoid
• 3 -2
timing/coasting clutch solenoid
(3-2T/CCS)
p r 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENT [LA4A-EL]
Yes Run OBD tests
Perform pinpoint test “A, C, D, F and G”
cr 0 5 -0 1 A AUTOMATIC TRANSAXLE ON-BOARD
DIAGNOSIS [LA4A-EL], Pinpoint Test
No Go to next step
0 5 -0 1 A -4 4