Mazda 626 Station Wagon, Workshop Manual

Page: 311 / 577

ON-BOARD DIAGNOSTIC
DTC P0756
DTC P0756
Shift solenoid B stuck OFF
DETECTION
CONDITION
• When all conditions below satisfied with ignition key turned to ON (start engine).
— ATF temperature 20 ' C {68 * F} or above.
— Driving in 1GR at D range.
— Engine speed 450 rpm or above.
— Turbine speed within 225—4,988 rpm.
— Differential gear case (output) revolution speed 35 rpm or above
— Throttle opening angle 6.25 % or above.
— Revolution ratio of forward clutch drum revolution to differential gear case revolution below 2.157.
— Any of DTC P0732, P0733, and P0734 not output.
POSSIBLE
CAUSE
• ATF level low
• Deteriorated ATF
• Shift solenoid B stuck
• Control valve stuck
• PCM malfunction
Diagnostic procedure
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available repair
information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
2 CHECK ATF CONDITION
• Turn ignition key to OFF.
• Check ATF condition.
— Clear red: Normal
— Milky: Water mixed in fluid
— Reddish brown: Deteriorated ATF
• Is it okay?
(See K2-28 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION, Automatic Transaxle Fluid
(ATF) Condition Inspection.)
Yes Go to next step.
No
If ATF color milky or reddish brown, replace ATF, then go
to Step 4.
(See K2-29 AUTOMATIC TRANSAXLE FLUID (ATF)
REPLACEMENT.)
3 CHECK ATF LEVEL
• Start engine.
• Warm up ATX.
• Is ATF level within specification?
(See K2-28 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION, Automatic Transaxle Fluid
(ATF) Level Inspection.)
Yes Go to next step.
No Adjust ATF level, then go to Step 6.
(See K2-28 AUTOMATIC TRANSAXLE FLUID (ATF)
INSPECTION, Automatic Transaxle Fluid (ATF) Level
Inspection.)
4 INSPECT LINE PRESSURE
• Start engine.
• Measure line pressure.
Specification
Idle: 334— 470 kPa {3.4— 4.8 kgf/cm2,
49—68 psl}
Stall: 1,158—1,323 kPa {11.8—13.5 kgf/cm2,
168—191 psi}
• Is line pressure within specification?
(See K2-21 MECHANICAL SYSTEM TEST, Line
Pressure Test.)
Yes
Go to next step.
No • All ranges: Replace oil pump or control valve body,
then go to Step 6.
(See K2-46 CONTROL VALVE BODY REMOVAL.)
(See K2-46 CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL [1623-10-98E].)
• Any ranges: Replace ATX, then go to Step 6.
(See K2-41 AUTOMATIC TRANSAXLE (ATX)
REMOVAL/INSTALLATION.)
5 CHECK OPERATION OF EACH VALVE AND
EACH SPRING
• Turn ignition key to OFF.
• Remove control valve body.
• Disassemble control valve body.
• Is each valve operation okay and is return
spring okay?
(See K2-46 CONTROL VALVE BODY
REMOVAL.)
(See K2-46 CONTROL VALVE BODY
INSTALLATION.)
(See ATX Workshop Manual FN4A-EL
[1623-10-98E]-)
Yes Replace ATX, then go to next step
(See K2-41 AUTOMATIC TRANSAXLE
REMOVAL/INSTALLATION.)
No Repair or replace shift valve and return spring, then go to
next step.
(See K2-46 CONTROL VALVE BODY REMOVAL.)
(See K2-46 CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL [1623-10-98E].)
K 2-104