1987 MAZDA 626 low oil pressure

HYDRAULIC CIRCUIT 7C
D RANGE (1ST GEAR)
Band servo
Kick-down solenoid
Downshift valve Throttle backup valve
76G07C-342
Pressure regulator valve
Line pressure
Operating line pressure
Governor pressure
Torque converter
Throttle pressure
Orifice ch< valve
Secondary * Primary x governor valve governor valve
Vacuum | throttle valve
valve
Apply side
Release side
Low and reverse brake pressure
Rear clutch pressure
Vacuum diaphragm
Oil pump
Throttle relief valve
J Orifii check valve
Orifice check valve
Front clutch pressure
Modifier 1! valve
7C—129

7C HYDRAULIC CIRCUIT
D RANGE (2ND GEAR)
Band servo
Vacuum diaphragm
Throttle backup valve
Orifice valve
76G07C-343
Oil cooler
Apply side
Release side
Oil pump
Secondary * governor valve Primary governor valve
Pressure regulator valve
Line pressure
Operating line pressure
Governor pressure
Torque converter
Throttle pressure
Orifice check valve
Modifier < valve
Low and reverse brake pressure
Rear clutch pressure
Front clutch pressure
Vacuum | throttle valve
Orifice check valve
Downshift valve 11
Throttl relief valve
Kick-down solenoid
7C—130

HYDRAULIC CIRCUIT 7C
D RANGE (3RD GEAR)
Band servo
Oil cooler
Low and reverse brake • pressure
Rear clutch pressure
4 Front clutch pressure
Vacuum diaphragm Kick-down solenoid
Downshift valve i I Vacuum throttle valve
Throttle backup valve
Orifice check valve
Modifier valve
Orifice check valve 11 Pressure regulator valve
Line pressure lis
Operating line pressure
Governor pressure
Torque converter
Throttle pressure Secondary x governor valve Primary * governor valve
76G07C-344
7C—131

7C HYDRAULIC CIRCUIT
D RANGE (KICK-DOWN; SHIFT VALVES IN 2ND POSITION)
Band servo
Oil cooler
Low and reverse brake • pressure Kick-down solenoid Vacuum 'diaphragm
Rear clutch pressure
Front clutch pressure
Jownshift 'alve 11 Oil pump Vacuum throttle valve
Throttle backup valve
Throttle relief I valve
Orifice check valve
Modifier valve Orifiw check valve
Second lock valve
Orifice chabk valve II Pressure regulator valve
CZ3 Line pressure
Ml Operating line pressure
• Governor pressure
Cm Torque converter
•I Throttle pressure
Primary x governor valve Secondary x governor valve
76G07C-345
7C—132

HYDRAULIC CIRCUIT 7C
2 RANGE (2ND GEAR)
Release side
Oil cooler
Low and reverse brake a pressure Vacuum diaphragm Kick-down solenoid
Rear clutch pressure
Front clutch pressure
Downshift valve I Vacuum throttle valve
Throttle backup valve
Throttle relief I valve
Orifice check valve
Modifier valve Orifice check valve I
2-3 shift I valve
Second lock valve
Orifice chsisk valve 11 I Pressure regulator valve
Line pressure in
Operating line pressure
Governor pressure
Torque converter
Throttle pressure Secondary x governor valve Primary x governor valve
76G07C-346
7C-133

7C HYDRAULIC CIRCUIT
1 RANGE (1ST GEAR)
Orifice
Low and reverse brake pressure
Rear clutch pressure
Front clutch pressure
Vacuum
>
diaphragm
76G07C-347
Oil cooler
Kick-down solenoid
] Down: valve Oil pump Vacuum throttle valve
I Throttle backup valve
Throttle relief] valve check valve
Modifier valve Orifice checkI valve
pLU Second l-i—| lock valve
Orifice valve
valve
Secondary x Primary governor valve governor valve
Line pressure m
Operation line pressure
Governor pressure
Torque converter
Throttle pressure
Pressure regulator valve
7C-134

HYDRAULIC CIRCUIT 7C
1 RANGE (2ND GEAR)
Band servo
Release side
Low and reverse brake I pressure
1 Rear clutch pressure
Vacuum diaphragm Kick-down solenoid
Front clutch pressure
Downsaift valve fl Oil pump Vacuum throttle valve
Throttle backup valve
Throttl relief I valve
Orifice check valve
Modifier valve Orifice check valve I
Second lock valve
Orifice valve Pressure regulator valve
I—i Line pressure

EH Operating line pressure

dH Governor pressure
I—I Torque convertei
Ml Throttle pressure Secondary x governor valve Primary x governor valve
76G07C-348
7C—135

TROUBLESHOOTING GUIDE 9
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Faulty operation of
driveshaft
Broken ball joint
Broken tri-pod joint
Worn or seized joint
Replace
Replace
Replace
9—31
9—35
9—31, 35
Abnormal noise from driveshaft Insufficient grease in joint or spline Excessive backlash on spline Worn joint
Add or replace
Replace
Replace
9—33, 36 9—31, 35 9-31, 35
Steering wheel pulls. (Steering wheel pulls toward either right or left side)
Bent steering linkage
Fatigued coil spring
Lower arm bushing worn or damaged Bent knuckle Bent lower arm or loose mounting Incorrect toe-in adjustment Improper tire air pressure Unevenly worn tires (left and right tires) Brake dragging
Refer to Section 10 Refer to Section 13 Refer to Section 13 Replace Refer to Section 13 Refer to Section 13 Refer to Section 12 Refer to Section 12 Refer to Section 11
9-11
Unstable handling Bent steering linkage
Joint in steering system worn or damaged
Incorrect steering pinion preload adjustment Fatigued coil spring
Faulty shock absorber(s) Lower arm bushing worn or damaged Incorrect toe-in adjustment (front or rear) Improper tire air pressure Wheel(s) bent or unbalanced
Refer to Section 10 Refer to Section 10 Refer to Section 10 Refer to Section 13 Refer to Section 13 Refer to Section 13 Refer to Section 13 Refer to Section 12 Refer to Section 12
—
Excessive steering wheel play Faulty front wheel bearing Incorrect steering pinion preload adjustment Rack and pinion worn Joint in steering system worn or damaged Lower arm bushing worn or damaged
Adjust Refer to Section 10 Refer to Section 10 Refer to Section 10 Refer to Section 13
9-11
Tires excessively worn or worn un-evenly
Incorrect toe-in adjustment Improper tire air pressure Unbalanced wheel(s)
Refer to Section 13 Refer to Section 12 Refer to Section 12 —
Abnormal noise
from axle
Faulty wheel bearing Replace 9-11,18,23
86U09X-006
9—7