Brake MAZDA 626 1987 Manual Online

TROUBLESHOOTING (G4A-HL) 7B
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 transaxle case
Stuck pressure regulator valve
Above specification
In D 2, and 1 One-way clutch 1 slipping
Above specification
In D range only One-way clutch 2 slipping
Above specification In 2 range only 2-4 brake slipping Above specification
In R range only
Low and reverse brake slipping
Above specification
In R range only
Reverse clutch slipping
Above specification
In R range only Perform a road test, to determine if this is caused by the low and reverse brake or the reverse clutch, as follows:
a) Effective 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 are functioning
normally.
Below specification
Engine out of tune
Below specification One-way clutch slipping within torque converter
76G07B-055
7B—51

7B TROUBLESHOOTING (G4A-HL)
STEP 4 (TIME LAG TEST)
If the selector lever is shifted while the engine is idling, there will be a certain time lapse, or time lag,
before shock is felt. This step checks this time lag for checking the condition of the N-D and N-R ac-
cumulators, forward, reverse and one-way clutches, and low and reverse brake.
Preparation
Perform the preparation procedure shown in the STEP 3 (STALL TEST).
Procedure
1. Start the engine and check that the idle speed is 900 l5o rpm.
2. Shift from N range to D range
3. Measure the time it takes from shifting until shock is felt using a stop watch.
4. Shift the selector to N range and run the engine at idle speed for at least one minute.
5. Perform the test for the shift from N range to R range in the same manner.
Note
Make three measurements for each test and take the average value.
Specified time lag: N -> D range 0.4—1.2 second
N -> R range 0.4—1.5 second
Evaluation
Condition Possible Cause
N D shift
More than specification
Insufficient line pressure
N D shift
More than specification Forward clutch slipping
N D shift
More than specification One-way clutch 1 slipping N D shift
More than specification
One-way clutch 2 slipping N D shift
Less than specification N-D accumulator not operating properly
N D shift
Less than specification Excessive line pressure
N-R shift
More than specification
Insufficient line pressure
N-R shift
More than specification Low & reverse brake slipping
N-R shift
More than specification
Reverse clutch slipping N-R shift
Less than specification N-R accumulator not operating properly
N-R shift
Less than specification Excessive line pressure
76G07B-056
7B-52

7B TROUBLESHOOTING (G4A-HL)
F8 engine
8/8-1
7/8-
6/8-<u
O) I
i ! O) Q.
o 3/8- [ ^ I o
jE 2/8-1 I
1/8- |
0/8 ' 1 ' 1 ' 1 1 1 1 1 1— ' l 0 20 40 60 80 100 120 140 (12) (25) (37) (50) (63) (74) (87)
Vehicle speed km/h (mph)
76G07B-060
Noise and vibration
Drive the vehicle in 1st gear and check for abnormal noise or vibration.
Note
Abnormal noise and vibration can also be caused by the torque converter, drive shaft or
differential. Therefore, checking of cause must be made with extreme care.
P Range Test
1. Shift into P range on a gentle slope, release the brake and check that the vehicle does not roll.
2. Shift into P range while driving the vehicle at maximum of 4 km/h (2.5 mph) on a level surface,
and check that the vehicle stops.
Vehicle Speed at Gearshift Table
Range Throttle condition Shifting Vehicle speed km/h (mph) Range Throttle condition Shifting FE engine F8 engine
D
Fully opened 1st ->• 2nd 50-65 (31-40) 47-62 (29-38)
D
Fully opened 2nd - 3rd 100-115 (62-71) 94-109 (58—68)
D
Half throttle (1/2)
1st - 2nd 17-32 (11-20) 16—31 (10—19)
D
Half throttle (1/2) 2nd -> 3rd 42-57 (26-35)
D
Half throttle (1/2) 3rd -> OD 79-94 (49-58) 74-89 (46-55)
D
Half throttle (1/2)
Lock-up 74-89 (46-55) D
Kick-down
OD - 3rd More than 88 (55) More than 82 (51) D
Kick-down
OD -> 2nd 34-103 (21-64) 33-97 (20-60)
D
Kick-down OD - 1st 27-49 (17-30) 26-48 (16-30)
D
Kick-down 3rd - 2nd 34—103 (21-64) 33-97 (20-60)
D
Kick-down
3rd - 1st
11
-49 (7—30) 10-48 (6-30)
D
Kick-down
2nd - 1st
1st - 2nd
4-49 (2-30) 3-48 (2-30)
1
Fully opened
2nd - 1st
1st - 2nd 56-71 (35-44) 52—67 (32—42)
1 Half throttle (1/2) 1st - 2nd 56-71 (35-44) 52-67 (32—42) 1
Kick-down 2nd -> 1st 46-61 (29-38) 43-58 (27-36)
D Fully opened 3rd lock-up 106-121 (66—75) 100-115 (62-71)
7B-56

7B TROUBLESHOOTING (G4A-HL)
Line Pressure Test
Preparation
1. Connect the SST to the line pressure output point
(square head plug L).
2. Connect a tachometer to the engine.
3. Perform the preparation procedure shown in STEP
3 (STALL TEST).
STEP 6 (OIL PRESSURE TEST)
This step checks line, throttle, and governor pressures to check the operation of hydraulic compo-
nents and for oil leakage.
83U07B-047
Procedure
76G07B-062
1. Start the engine and check that the idle speed is 900 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 performed within 5 seconds.
5. Shift the selector lever to N range and run the engine at idle for at least one minute.
6. Read the line pressure at idle and engine stall speeds for each range in the same manner.
7B—58

TROUBLESHOOTING (G4A-HL) 7B
Specified Line pressure:
Condition Line pressure kPa (kg/cm2, psi)
Range DSL R
When idling 350-490 (3.6-5.0, 51-71) 600-830 (6.1-8.5, 87-121)
At stall speed 980-1230 (10.0—12.5, 142—178) 1470-1960 (15.0-20.0, 213-284)
76G07B-063
Evaluation
Condition Possible Cause
Below specification
In all ranges
Worn oil pump
Below specification
In all ranges
Fluid leakage from the oil pump, control valve body
and/or transaxle case
Below specification
In all ranges Stuck pressure regulator valve
Below specification
In all ranges
Stuck throttle valve
Below specification
In all ranges
Stuck pressure modulator valve
Below specification
In D, 2 and 1 range
Fluid leakage from the forward clutch hydraulic circuit
Below specification
In D, 2 and 1 range Fluid leakage from the governor valve hydraulic circuit
Below specification
In D, 2 and 1 range
Fluid leakage from the N-R accumulator seal rings
Below specification In D and 1 range Fluid leakage from the 2-3 accumulator seal rings Below specification In D and 1 range Fluid leakage from the 1-2 accumulator seal rings Below specification
In D and R range Fluid leakage from the N-D accumulator seal rings
Below specification
In 2 and 1 range Fluid leakage from the coasting clutch hydraulic circuit
Below specification
In 2 and 1 range Stuck throttle backup valve
Below specification
In R and 1 range Fluid leakage from the low and reverse brake hydraulic
circuit
Below specification
In 2 range only Fluid leakage from 2-4 brake servo hydraulic circuit
Below specification
In 1 range only Stuck low reducing valve
Below specification
In R range only Fluid leakage from reverse clutch hydraulic circuit
Excessive line pressure
Stuck throttle valve
Excessive line pressure Stuck throttle modulator valve Excessive line pressure Stuck pressure regulator valve Excessive line pressure
Stuck throttle backup valve
76G07B-216
7B—59

7B TROUBLESHOOTING (G4A-HL)
Throttle Pressure Test
Preparation
1. Connect the SST to the throttle pressure output
point (Square head plug T).
2. Connect a tachometer to the engine.
3. Perform the preparation procedure shown in STEP
3 (STALL TEST).
83U07B-052
Procedure
76G07B-064
1. Start the engine and check that the idle speed is 900 _5o rpm.
2. Shift the selector to D range.
3. Read the throttle 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 throttle pressure as soon as the engine speed becomes constant, then release the ac-
celerator pedal.
Caution
Steps 4 to 5 must be performed within 5 seconds.
7B-60

7B ELECTRICAL SYSTEM COMPONENTS
76G07B-073
7B-66
3. Remove the screw and move the inhibitor switch
so that the small hole is aligned with the screw hole.
4. Set the alignment by inserting a 2.0 mm (0.079
in) diameter pin through the holes.
5. Loosely tighten the switch mounting bolts, remove
the pin, and reinstall the screw.
6. Tighten the switch mounting bolts to specification.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
7. Recheck the continuity of the individual terminals.
WATER TEMPERATURE SWITCH
Inspection
1. Remove the water temperature switch.
2. Place the switch in water with a thermometer and
heat up the water gradually.
3. Check the continuity of the terminals. If necessary
replace the switch.
Connection guide
Water temperature Continuity
Below 65°C (149°F) Yes
Above 72°C (162°F) \ No
FLUID TEMPERATURE SWITCH (G4A-EL)
Inspection
1. Remove the fluid temperature switch.
2. Place the switch in oil with a thermometer as shown
and heat it up gradually.
3. Check the continuity of the terminals. If necessary
replace the switch.
Connection guide
Fluid temperature Continuity
Above 150°C (302°F) Yes
Below 143°C (289°F) No
BRAKE LIGHT SWITCH (G4A-EL)
Inspection of Terminal Voltage
1. Turn the ignition switch ON.
2. Check the voltage between terminal (WG) and
ground while depressing the brake pedal.
Terminal voltage I Brake pedal
Approx. 12V Depressed
Below 1,5V Released
3. If not correct, check continuity of the switch.

ELECTRICAL SYSTEM COMPONENTS 7B
Inspection of Continuity
1. Disconnect the brake light switch connector.
2. Check for continuity between the terminals while
depressing the brake pedal.
79G07C-114
76G07B-076
KICK-DOWN SWITCH (G4A-HL)
Inspection of Terminal Voltage
1. Turn the ignition switch ON.
2. Check the voltage at terminal (V) with a voltmeter.
Depressing stroke Terminal voltage
7/8-8/8 (Full) Approx. 12V
0-7/8 Below 1,5V
3. If not correct, check the wiring harness, switch, or
adjust the switch position.
Inspection of Continuty
1. Disconnect the kick-down switch connector.
2. Check for continuity of the switch with an
ohmmeter.
Switch Continuity
Pushed Yes
Released No
3. If not correct, replace the kick-down switch.
76G07B-077
Adjustment
1. Loosen the kick-down switch locknuts.
2. Depress the accelerator pedal fully.
3. Turn the switch until the threaded case touches the
stopper.
4. Turn the switch counterclockwise by one half revo-
lution.
5. Secure the switch with the locknut.
76G07B-078
7B—67

7B ELECTRICAL SYSTEM COMPONENTS
Terminal Connected to Voltage Condition
1J — — —
1K — — —
1L (Input) Idle switch Below 1.5V At idle 1L (Input) Idle switch Approx. 12V Other speeds
1M — — —
1N (Input) Brake light switch Approx. 12V Brake pedal depressed 1N (Input) Brake light switch Below 1.5V Brake pedal released
10 (Input) Throttle sensor
Approx. 5V Ignition switch ON 10 (Input) Throttle sensor Below 1,5V Ignition switch OFF
1P (Input)
Throttle sensor
Approx. 0.5—4.3V Throttle valve fully closed to fully open
1Q (Input) Vehicle speed sensor
Approx. 4.5V During driving
1Q (Input) Vehicle speed sensor Approx. 4.5V or below 1.5V Vehicle stopped
1R (Ground) Throttle sensor Below 1,5V —
1S (Input) Pulse generator Approx. 12V Engine running 1S (Input) Pulse generator Below 1,5V Engine stopped
1S (Ground) Pluse generator Below 1.5V —
2A (Battery power) Battery Approx. 12V Ignition switch ON 2A (Battery power) Battery Below 1,5V Ignition switch OFF
2B (Ground) Body ground Below 1,5V —
2C (Memory power) Battery Approx. 12V —
2D (Ground) Body ground Below 1,5V —
2E (Output) 1-2 shift solenoid valve Approx. 12V
Refer to page 7B—26 of solenoid valve
operation table
2E (Output) 1-2 shift solenoid valve Below 1.5V Refer to page 7B—26 of solenoid valve
operation table
2F (Output) 2-3 shift solenoid valve Approx. 12V
Refer to page 7B—26 of solenoid valve
operation table
2F (Output) 2-3 shift solenoid valve Below 1,5V
Refer to page 7B—26 of solenoid valve
operation table
2G — — —
2H (Output) 3-4 shift solenoid valve Approx. 12V Refer to page 7B—26 of solenoid valve operation table 2H (Output) 3-4 shift solenoid valve Below 1.5V
Refer to page 7B—26 of solenoid valve operation table
21 — — —
2J (Output) Lock-up solenoid valve Approx. 12V Lock-up 2J (Output) Lock-up solenoid valve Below 1,5V Other
2K (Output) Hold indicator Below 1,5V Hold mode 2K (Output) Hold indicator Approx. 12V Other modes
2L (Output) Mode indicator Approx. 12V Hold mode 2L (Output) Mode indicator Below 1,5V Power or economy mode
2M (Output) EC-AT Tester
(malfunction code)
Approx. 12V Normal
2M (Output) EC-AT Tester
(malfunction code) Below 1,5V If malfunction present 2M (Output) EC-AT Tester
(malfunction code) Code signal Self-diagnosis check connector grounded
2N — — —
20 (Input) Fluid temperature switch Below 1,5V Above 150°C (302°F) 20 (Input) Fluid temperature switch Approx. 10—12V Below 143°C (289°F)
2P (Input) EC-AT check connect Approx. 12V —
76G07B-084
7B-70

ON-VEHICLE MAINTENANCE 7B
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. Oil pan
2. Control valve body cover
3. Oil pump
4. Inhibitor switch
5. Speedometer driven gear
6. Pulse generator (G4A-EL)
7. Oil filler tube
8. Throttle cable
9. Bearing cover
76G07B-085
10. Driveshaft
11. Square head plug
12. Transaxle case
13. Drain plug
14. Oil cooler return pipe
15. Oil cooler outlet pipe
16. Fluid temperature switch (G4A-EL)
17. Blind plugs
18. Governor cover (G4A-HL)
Inspection of Level
1. Apply the parking brake and position wheel chocks
to prevent the car from rolling forward.
Note
Place the car on a flat, level surface.
2. Run the engine so that the automatic transaxle fluid
reaches specified temperature.
3. While the engine is idling, shift the select lever from
P to L or P to 1 and back again.
4. Let the engine idle.
5. Shift the select lever to P.
76G07B-086
7B—71