1987 MAZDA 626 oil

7C TROUBLESHOOTING
Evaluation
Condition Possible cause
Worn oil pump
In all ranges Insufficient line
pressure
Oil leakage from oil pump, control
valve, and/or transaxle case
Stuck pressure regulator valve
In D, 2, and 1 Rear clutch slipping
Above specification In D range only One-way clutch slipping
In 2 range only Brake band slipping
Low and reverse brake slipping
Brake band slipping
In R range only Road test to determine if cause is low and reverse brake or reverse clutch:
a) Engine braking in 1 range Front clutch b) No engine braking in 1 range .... Low and reverse brake
Within specification All shift control elements within transaxle functioning normally
Below specification Engine out of tune Below specification
One-way clutch slipping within torque converter
76G07C-026
7C—16

7C TROUBLESHOOTING
STEP 5 (OIL PRESSURE TEST)
This step determines line pressure, and governor pressure to check the hydraulic components and
for oil leakage.
Line Pressure Test
Preparation
1. Connect the SST to the line pressure output point.
2. Connect a tachometer to the engine.
3. Follow the test preparation procedure show in STEP 2 (STALL TEST).
Procedure
76G07C-030
1. Start the engine and verify that the idle speed is 950-5° rpm.
2. Shift the selector lever to D range.
3. Read the line pressure at idle.
4. Depress the brake pedal firmly with the left foot, and gradually depress the accelerator pedal with
the right foot.
5. Read the line pressure as soon as the engine speed becomes constant; then release the accelera-
tor pedal.
Caution
Steps 4 to 5 must be done within 5 seconds.
5. Shift the selector lever to N range and let the engine idle for one minute or more.
6. Read the line pressure at idle and engine stall speeds for each range in the same manner.
7C—20

TROUBLESHOOTING 7C
Specified line pressure:
Range Pressure kPa (kg/cm2, psi) Range
Idle Stall
D 294-392 (3-4, 43-57) 883-1079 (9—11, 128-156)
2 785—1177 (8—12, 114—171) 785-1177 (8—12, 114-171)
1 294-392 (3-4, 43—57) 883-1079 (9—11, 128—156)
R 392-687 (4-7, 57-100) 1570—1864 (16—19, 228-270)
76G07C-031
Evaluation
Condition Possible cause
Below standard
In all ranges
Worn oil pump
Below standard
In all ranges Fluid leakage from the oil pump, control valve, or transaxle case
Below standard
In all ranges
Stuck pressure regulator valve Below standard
In D, 1, 2 ranges Fluid leakage from the rear clutch or governor hydraulic circuit, or both
Below standard
In R range only Fluid leakage from the low and reverse brake hydraulic circuit
Excessive line pressure at idle Leaking or disconnected vacuum hose Excessive line pressure at idle
Leaking vacuum diaphragm
76G07C-032
76G07C-033
Vacuum
gauge Line
pressure
Governor pressure
At Atmosphere Radical line Read
& 200 mmHg pressure governor
(7.87 inHg) reduction
Line Pressure Cutback Point
1. Connect the SST to the line pressure output point
and the governor pressure output point in the trans-
axle case, and place the gauges inside the vehicle.
2. Disconnect the hose to the vacuum diaphragm,
and plug it.
3. Connect a vacuum pump to the vacuum di-
aphragm, and place the pump inside the vehicle.
4. Gradually accelerate the vehicle in D range.
5. Read the governor pressure at the point where the
line pressure suddenly drops.
6. Apply 200 mmHg (7.87 inHg) vacuum, and re-
peat steps 4 and 5.
Standard
Vacuum mmHg (InHg) Governor pressure kPa (kg/cm2, psi)
Atmospheric pressure 98-157 (1.0—1.6, 14-23)
200 (7.87) 39-98 (0.4-1.0, 6—14)
Evaluation
Incorrect pressures
1. Missing diaphragm rod or rod length incorrect, or
both.
2. Stuck valve in control valve.
76G07C-034
7C—21

ON-VEHICLE MAINTENANCE 7C
ON-VEHICLE MAINTENANCE
AUTOMATIC TRANSAXLE FLUID (ATF)
Inspection for Fluid Leaks
Check for fluid leaks; the following figure shows the locations where fluid leakage may possibly occur.
1. Kick-down solenoid
2. Vacuum diaphragm
3. Manual shaft
4. Speedometer driven gear
5. Oil level tube
6. Governor cover
7. Governor
8. Oil pan
9. Oil pump
10. Inhibitor switch
11. Transaxle case
12. Oil pump
13. Square head plugs
14. Bearing cover
15. Drive shaft
76G07C-041
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Inspection of Level
1. Apply the parking brake and block the wheels to
prevent the vehicle from rolling.
Note
Place the car on a flat, level surface.
2. Run the engine so that the automatic transaxle fluid
reaches operating temperature.
3. While the engine is idling, shift the select lever from
P to 1 and back again.
4. Let the engine idle.
5.Shift the select lever to P.
76G07C-042
7C-25

ON-VEHICLE MAINTENANCE 7C
76G07C-045
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5. Turn locknut A by hand until it just touches the
spacer.
6. Tighten locknut B to the specified torque.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
7. Verify that there is a click at each range when shift-
ed from P «-» 1 range.
8. Check that the positions of the selector lever and
the indicator are exact.
9. Check that the button returns smoothly when used
to shift the selector.
10. If necessary, check the spring.
VACUUM DIAPHRAGM
Inspection
1. Remove the vacuum hose from the vacuum di-
aphragm. Check for ATF leakage. Replace if any
is found.
2. Remove the vacuum diaphragm.
3. Verify that the diaphragm rod moves when vacu-
um is applied.
Caution
When removing the diaphragm, do not drop
the rod into the oil pan.
76G07C-046
Vacuum diaphragm
Adjustment
Note
a) Excessive shift shocks and improper shift-
ing often indicate a vacuum diaphragm mal-
function.
b) Remove approximately 1.0 liter (1.1 US qt,
0.9 Imp qt) of ATF before removing the
vacuum diaphragm.
1. Remove the vacuum diaphragm, rod, and O-ring
from the transaxle case.
2. Measure the N dimension indicated in the figure
with the SST and a scale.
3. Select the diaphragm rod in accordance with the
table.
N dimension Applicable diaphragm
rod length
Below 25.4 mm (1.000 in) 29.5 mm (1.161 in)
25.4—25.9 mm (1.000-1.020 in) 30.0 mm (1.181 in)
25.9—26.4 mm (1.020-1.039 in) 30.5 mm (1.200 in)
26.4—26.9 mm
(1.039—1.059 in) 31.0 mm (1.220 in)
26.9 mm (1.059 in) or over 31.5 mm (1.240 in)
76G07C-048
10,-21

7C ON-VEHICLE MAINTENANCE
REPLACEMENT OF CONTROL VALVE
1. Disconnect the negative battery cable.
2. Jack up the vehicle and support it with safety
stands.
3. Drain the ATF.
4. Remove the under cover and side cover.
76G07C-049
63U07B-024
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76G07C-050
5. Remove the oil pan from the transaxle case.
Caution
Be careful because some ATF will be in the
oil pan.
6. Remove the control valve body.
Caution
Be careful not to lose the ball and spring for
the torque converter relief valve or the vacu-
um diaphragm rod.
7. Install the control valve body as follows:
(1) Install the vacuum diaphragm rod.
(2) Insert the ball and spring into the hole in the
transaxle case.
Note
a) The ball is inserted first, then the spring.
b) Use petroleum jelly to prevent them from
falling out.
(3) Install the control valve, mating the groove of
the manual valve with the driving pin of the con-
trol rod.
(4) Tighten the control valve mounting bolts to the
specified torque.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
8. Install the oil pan and tighten the bolts to the speci-
fied torque.
Tightening torque:
5—8 N-m (50—80 cm-kg, 43—69 in-lb)
76G07C-051
7C-28

ON-VEHICLE MAINTENANCE 7C
9. Install the under cover and side cover.
10. Lower the vehicle.
11. Add ATF, and with the engine idling, check the fluid
level.
12. Verify that there is no fluid leakage from the trans-
axle. (Refer to page 7C—25.)
76G07C-052
REPLACEMENT OF SERVO PISTON RETURN
SPRING
1. Remove the control valve body. (Refer to replace-
ment of control valve.)
2. Loosen the anchor end-bolt and locknut.
3. Remove the band strut.
4. Compress the servo piston retainer with the SST.
5. Remove the snap ring with a screwdriver.
76G07C-053
76G07C-054
6. Remove the servo retainer, piston and spring by
gradually loosening the SST.
7. Replace the return spring. If the O-ring or the piston
seal is damaged, replace them.
8. Assemble the servo retainer, piston, and spring,
insert them into the case with the SST. Fit the snap
ring into the ring groove.
9. Install the band strut.
10. Tighten the anchor-end bolt to 12—15 N-m
(120—150 cm-kg, 104—130 in-lb), then back it
off two full turns. Tighten the locknut to 55—80
N m (5.6—8.2 m-kg, 41—59 ft-lb).
11. Install the control valve body, oil pan, etc. in the
reverse order of removal.
12. Adjust the fluid level, and check for fluid leaks.
(Refer to page 7C—25.)
76G07C-055
7C—29

7C REMOVAL
REMOVAL
PREPARATION
(1) Drain the ATF before removal.
(2) Attach the engine support.
(3) Jack up the vehicle and support it with safety stands.
Components
1. Battery
2. Battery carrier
3. Fresh air duct
4. Main fuse block
5. Distributor leads
6. Speedometer cable
7. Cnnectors
8. Ground wires
9. Selector cable
10. Vacuum hose
11. Front wheels
12. Splash shields
13. Oil cooler outlet and inlet
hoses
14. Tie-rod ends
15. Stabilizer bar control links
16. Lower arm ball joints
17. Driveshaft
18. Joint shaft bracket
76G07C-056
19. Joint shaft and driveshaft
20. Under cover
21. Torque converter bolts
22. Starter
23. Engine mount No.4
24. Engine mount No.2
25. Crossmember and left side
lower arm
26. Transaxle
7C-30