1987 MAZDA 626 low oil pressure

4C FUEL SYSTEM
COMPONENT DESCRIPTION
Component Function Remark
Air flow sensor Detects amount of intake air;
sends signal to engine control unit
Clutch switch Detects in-gear condition; sends signal to engine control unit Switch ON when clutch pedal released
Engine control unit Detects signals from input sensors and switches; controls injector and fuel pump operations
Fuel filter Filters fuel
Fuel pump Provides fuel to injectors • Operates while engine running
• Installed in fuel tank
Fuel pump control unit (4WS) Monitors fuel level in left section; controls transfer pump operation
G signal pick-up Detects No.1 cylinder TDC; sends signal to engine control unit Installed in distributor
Idle switch Detects when throttle valve fully closed; sends signal to engine control unit Installed on throttle body
Ignition switch (ST position) Sends engine cranking signal to engine control unit
Injector Injects fuel into intake port • Controlled by signals from engine control unit • High-ohmic injector
Intake air thermo sensor Detects intake air temperature; send signal to engine control unit
Control relay Supplies electric current to injectors fuel pump and engine control unit
Ne signal pick-up Detects crank angle at 180° intervals; sends signal to engine control unit Installed in distributor
Neutral switch Detects in-gear condition; sends signal to engine control unit
Switch ON when in gear
Oxygen sensor (Unleaded fuel) Detects oxygen concentration; sends signal to engine control unit
• Zirconia ceramic and platinum coating • Integrated heater coil
Pressure regulator Adjusts fuel pressure supplied to injectors
Pulsation damper Absorbs fuel pulsation
Throttle sensor Detects throttle valve opening angle;
sends signal to engine control unit
Installed on throttle body
Transfer pump (4WS) Pumps fuel from the left to the right side Controlled by fuel pump control unit
Transfer pump switch (4WS) Detects fuel level in left section;
sends signal to control unit
Water thermo sensor Detects coolant temperature; sends signal to engine control unit
Water thermo switch (Unleaded fuel) Detects radiator coolant temperature; sends signal to engine control unit ON: above 17°C (63°F)
76G04C-088
4C-50

VE-TYPE RF71 13 800C: 104749-0343 For RF-CX
# TEST OIL SAE Standard test oil (SEA 967C)
Fuel injection amount Chamber pressure and timer stroke Load sensing timer and overflowing quantity Measurenment
Item Pump speed (RPM) Fuel injection amount
(cm3/stroke)
Start 100 More than 55/1,000
Full load
600 33.9—38.9/1,000
Full load
1,000 48 9—50.9/1,000
Full load 2,150 39.7—44 7/1,000 Full load
2,250 32.7-37.7/1,000
Full load
2,550 8.0—15.0/1,000
Idling 360 7.6—10.6/1,000
c CD
CD O
o 3 03 3 o c 3
O 3
o o o
o
CD
O
CD
50
40
30
20
10
Pump speed (RPM) Chamber pressure
(kg/cm2)
Timer stroke (mm)
500 500
1,250 4.5—5.1 2.7—3.9
1,500 5.2—5.8 4 3-4.9
2,150 6.8—7 4 7.6-8.8
Item Fuel injectioon amount
(cm3/stroke)
Load sens-ing timer
Start 37.2-39.2/1,000 Load sens-ing timer End 32.2-34.2/1.000
Overflowing quantity 41.0—85.0/1.000
"Checking condition
Pump speed: 1,500 rpm
Lever: Full load
Measuring place Dimension (mm)
KF 5.7—5.9
K 3.2—3.4
MS 1.6-1.8

/ J*
—
s
100 600 1,000 1,250 1,500
Injection pump speed RPM
10
2,150 2,250 2,550
CD
-I "0
i| T3 co o ^ =T O 03 3 cr
3? 3 ^ CD V) CO c CD
CD O r+ o 3
•D C 3 TJ
o
n> -i a> o r* ®
a> ^
o
3) n
O X
m r-
o> -<
(/> H m
D
expert22 ajia http://rutracker.org

o
GO o
VE-TYPE RF79 13 800A: 104748-0343 For RF-N ENGINE
£ TEST OIL SAE Standard test oil (SEA 967C)
Fuel injection amount Chamber pressure and timer stroke Load sensing timer and overflowing quantity Measurenment
Item Pump speed (RPM)
Fuel injection amount
(cm3/stroke)
Start 100 More than 42/1,000
Full load
600 29.0—33.0/1,000
Full load
1.375 34.9—36.9/1,000
Full load 2,325 30 2—34.2/1,000 Full load
2,600 9.8—15 8/1,000
Full load
2,700 Max. 6 0/1,000
Idling 360 8-12/1,000
Pump speed (RPM) Chamber pressure
(kg/cm2)
Timer stroke
(mm)
600 2 2—2.8
1,375 4 4—5,0 3 9—4.5
1,800 5 6—6.2 6.1-7.3
2.325 6.9—7.5 7.2—8.4
Item Fuel injectioon amount
(cm3/stroke)
Load sens- Start 26.7-29.7/1,000
ing timer End 14.6—17.6/1,000
Overflowing quantity 46.3—90.3/1.000
'Checking condition
Pump speed: 1,375 rpm
Lever: Full load
Measuring place Dimension (mm)
KF 5.8—5.9
K 3.2—3 4
MS 1.4—1.6
c (D O
o'
3 03 3 o c 3
O 3
o o o
o
CD
50
40
30
20
10
r
10
100 600
o o
1,375 1,800
Injection pump speed RPM
2,325 2,600 2,700
H -D
u -1 T3 52. ° ? T1
O 0> 3 cr 3 S
CD (0 (A c ®
"3? CD o" 3
(D O r* o 3
u C 3 "O
O 3" 0) ^ 0> o CO
a o
3 •n
m i-
co •<
(/> H m

7B
AUTOMATIC TRANSAXLE
(Electronically Controlled and 4-Speed)
OUTLINE 7B— 2
SPECIFICATIONS 7B— 2
COMPONENT LOCATION 7B— 3
STRUCTURAL VIEW 7B— 5
OPERATION OF COMPONENTS 7B— 6
FLUID PASSAGE LOCATION 7B— 9
TROUBLESHOOTING (G4A-EL) 7B— 12
GENERAL NOTE 7B— 12
STEP 1
(WARNING CODE RETRIEVAL) 7B— 15
STEP 2
(PRELIMINARY INSPECTION) 7B— 22
STEP 3 (SIGNAL INSPECTION) 7B— 24
STEP 4 (STALL TEST) 7B— 27
STEP 5 (TIME LAG TEST) 7B— 30
STEP 6 (OIL PRESSURE TEST) 7B— 31
STEP 7 (ROAD TEST) 7B— 34
TROUBLESHOOTING (G4A-HL) 7B— 41
GENERAL NOTE 7B— 41
STEP 1
(PRELIMINARY INSPECTION) 7B— 44
STEP 2 (ELECTRICAL
SYSTEM INSPECTION) 7B— 47
STEP 3 (STALL TEST) 7B— 49
STEP 4 (TIME LAG TEST) 7B- 52
STEP 5 (ROAD TEST) 7B— 53
STEP 6 (OIL PRESSURE TEST) 7B— 58
ELECTRICAL SYSTEM
COMPONENTS 7B— 63
MODE SWITCH (G4A-EL) 7B— 63
HOLD SWITCH (G4A-EL) 7B— 63
OD OFF SWITCH (G4A-HL) 7B— 64
INHIBITOR SWITCH 7B- 65
WATER TEMPERATURE SWITCH 7B— 66
FLUID TEMPERATURE SWITCH
(G4A-EL) 7B— 66
BRAKE LIGHT SWITCH
(G4A-EL) 7B— 66
KICK-DOWN SWITCH (G4A-HL) 7B— 67
PULSE GENERATOR (G4A-EL) 7B- 68
VEHICLE SPEED SENSOR
(G4A-EL) 7B— 68
CRUISE CONTROL SWITCH
(CRUISE CONTROL UNIT) 7B— 68
IDLE SWITCH AND THROTTLE
SENSOR (G4A-EL) 7B— 68
OD RELEASE SOLENOID
VALVE (G4A-HL) 7B— 68
SOLENOID VALVES (G4A-EL) 7B— 69
NO LOAD SIGNAL (G4A-EL) 7B— 69
MODE, AND HOLD INDICATOR
LIGHT (G4A-EL) 7B— 69
OD OFF INDICATOR LIGHT
(G4A-HL) 7B— 69
EC-AT CONTROL UNIT
(G4A-EL) 7B— 69
ON-VEHICLE MAINTENANCE 7B— 71
AUTOMATIC TRANSAXLE
FLUID (ATF) 7B— 71
SELECTOR LEVER 7B— 72
THROTTLE CABLE 7B— 73
CONTROL VALVE BODY 7B— 77
OIL STRAINER 7B— 79
ADJUSTMENT OF 2-4 BRAKE
BAND 78— 80
REPLACEMENT OF
DRIVESHAFT OIL SEAL 7B— 80
OIL COOLER 7B— 81
GOVERNOR (G4A-HL) 7B— 82
REMOVAL 7B— 83
PRECAUTION 7B— 83
DISASSEMBLY 7B— 88
DISASSEMBLY-STEP 1 7B— 88
DISASSEMBLY-STEP 2 7B— 94
DISASSEMBLY-STEP 3 7B— 99
DISASSEMBLY-STEP 4 7B—103
INSPECTION AND REPAIR 7B—107
PRECAUTION 7B—107
TORQUE CONVERTER 7B—107
OIL PUMP 7B—108
CLUTCH ASSEMBLY 7B—113
SMALL SUN GEAR AND
ONE-WAY CLUTCH 7B—122
ONE-WAY CLUTCH AND
CARRIER HUB ASSEMBLY 7B-126
3-4 CLUTCH 7B—128
2-3 ACCUMULATOR 7B—132
GOVERNOR ASSEMBLY
(G4A-HL) 7B-133
LOW AND REVERSE BRAKE 7B—134
2-4 BRAKE BAND 7B—135
BAND SERVO 7B—135
OTHER INSPECTION 7B—135
CONTROL VALVE BODY
(G4A-EL) 7B-136
CONTROL VALVE BODY
(G4A-HL) 7B-155
DIFFERENTIAL 7B—177
OUTPUT GEAR 7B—181
IDLE GEAR 7B—182
BEARING COVER ASSEMBLY 7B—185
BEARING HOUSING 7B—186
ASSEMBLY 7B-187
PRECATION 7B—187
ASSEMBLY-STEP 1 7B—187
ASSEMBLY-STEP 2 7B—197
ASSEMBLY-STEP 3 7B—202
ASSEMBLY-STEP 4 7B—208
INSTALLATION 7B—215
TORQUE SPECIFICATIONS 7B—215
HYDRAULIC CIRCUIT (G4A-EL) 7B—221
HYDRAULIC CIRCUIT (G4A-HL) 7B—239
76G07B-001

7B OUTLINE
Transaxle Case
To governor valve
/and 2-3 accumulator
Inlet to control valve body
(governor pressure)
Outlet to torque converter
(Release side)
Outlet to torque converter
(Apply side)
Outlet to 3-4 clutch
To governor valve and 2-3 accumulator^
From governor valve (governor pressure)
To torque converter (Release side)
To torque converter (Apply side)
To 3-4 clutch
From oil pump
(To control valve body)
°Lto coasting clutch
y
To reverse clutch
To forward clutch
To low and reverse brake
To 2-4 brake apply side
CgEfey a —* To 2-4 brake release side
7B—10
76G07B-009

TROUBLESHOOTING (G4A-EL) 7B
By following the above seven steps, the cause of the problem should be located.
As another guide to faster location of the causes of problems, the Quick Diagnosis Chart is included
at pages 7B—13, 14.
In this chart, a circle is used to indicate the components that might be the cause of trouble for 23
types of problems. It is only necessary to check those components indicated by circles, at each step
cf the troubleshooting process, in order to quickly locate the cause of the problem.
Quick Diagnosis Chart
The Quick Diagnosis Chart shows various problems and the relationship of various components that
might be the cause of the problem.
1. Components indicated in the "Self-Diag." column are diagnosed by the EC-AT control unit self-
diagnosis function.
The EC-AT Tester can be used for easy retrieval of these signals.
2. Components indicated in the "Adjustment" column indicate that there is a possibility that the prob-
lem may be the result of an incorrect adjustment.
Check the adjustment of each component, and readjust if necessary.
3. Input and outout signals of the EC-AT control unit for the components indicated in the "EC-AT
TESTER" column can be easily checked by using of the EC-AT Tester.
4. Components indicated in the "Stall Test" column can be checked for malfunction by the results
of the stall test.
5. Components indicated in the "Time Lag Test" column can be checked for malfunction by the results
of the time lag test.
6. Components indicated in the "Oil Pressure Test" column can be checked for malfunction by the
results of the oil pressure test.
7. Components indicated in the "Road Test" column can be checked for malfunction by the results
of the road test.
8. The checking, adjusting, repair or replacement procedures for each component is described in the
page(s) noted in the "Reference Page" column.
7B—13

TROUBLESHOOTING (G4A-EL) 7B
7. Perform the stall test for the following ranges in the same manner.
(1) D range (4) L range
(2) D range (Hold) (5) L range (Hold)
(3) S range (Hold)
Caution
Be sure to allow sufficient cooling time between each stall test.
Engine stall speed: D.S.L range 2170—2270 rpm
R range 2130—2230 rpm
Note
The stall test can be performed with the EC-AT Tester in place of a tachometer.
Drum stall speed indication: 0 rpm
76G0/B-029
Evaluation
Condition Possible cause
Above specification
In all ranges Insufficient line
pressure
Worn oil pump
Above specification
In all ranges Insufficient line
pressure Oil leakage from oil pump, control valve, and/or transmission case
Stuck pressure regulator valve
Above specification
In forward ranges Forward clutch slipping One-way clutch 1 slipping
Above specification
In D range One-way clutch 2 slipping
Above specification
In S (Hold) and L (Hold) ranges Coasting clutch slipping
Above specification In D (Hold) and S (Hold) ranges 2-4 brake band slipping Above specification
In R, L and L (Hold) ranges Low and reverse brake slipping
Above specification
In R range
Low and reverse brake slipping Reverse cluch slipping Perform road test to determine whether problem is low and reverse brake or reverse clutch
a) Engine brake applied in 1st ...Reverse clutch
b) Engine brake not applied in 1st ...Low and reverse brake
Within specification All shift control elements within transmission are func-
tioning normally.
Below specification
Engine out of tune
Below specification One-way clutch slipping within torque converter
86U07B-036
7B-29

7B TROUBLESHOOTING (G4A-EL)
Specified line pressure:
Line pressure kPa, (kg/cm2, psi)
Range DSL R
When idling 353-432 (3.6-4.4, 51-63) 598—942 (6.1-9.6, 87—137)
At stall speed 873-1040 (8.9-10.6, 127-151) 1668-2011 (17.0-20.5, 242-292)
76G07B-032
Evaluation
Line pressure Possible location of problem
Low pressure in every position
Worn oil pump
Fluid leaking from oil pump, control valve body, or transaxle case
Pressure regulator valve sticking
Low pressure in D and S only Fluid leaking from hydraulic circuit of forward clutch
Low pressure in R only Fluid leaking from hydraulic circuit of low and reverse brake
Higher than specification
Throttle valve sticking
Throttle modulator valve sticking
Pressure regulator valve sticking
76G07B-033
7B—32