1987 MAZDA 626 sensor

TROUBLESHOOTING (G4A-EL) 7B
06 4 second period
55 4 second period
63
-*•
4 second period
Repeats above
General Note
1. If there is more than one malfunction, the code
numbers will be displayed on the tester one by one
in a numerical order. In the case of malfunctions,
55, 06, and 63, the code numbers are displayed
in an order of 06, 55, then 63. The display is as
shown.
86U07B-018
When the service connector
is not grounded
Malfunctions YES
NO
Hold indicator YES
flashing NQ
YES
NO
Memory in control unit
2. The hold indicator flashes to indicate the same pat-
tern as the buzzer of the EC-AT Tester when the
EC-AT service connector is grounded.
When the EC-AT service connector is not ground-
ed, the indicator flashes in a constant frequency
while a malfunction is occurring and goes out
if
the
malfunction recovers. However, the warning code
is memorized in the EC-AT control unit.
76G07B-015
Sensors-
Solenoid-valve
Fail-safe program Proces--\Out sing -v puts
The EC-AT control unit has a built-in fail-safe func-
tion for the throttle sensor, the pulse generator, and
the 1-2, 2-3, and 3-4 shift solenoid valves.
If a malfunction occurs, the EC-AT control unit will
control operation of the remaining components ac-
cording to a preset fail-safe program.
The vehicle may still be driven, although the driv-
ing performance will be slightly affected.
79G07C-062
4. The memory of warning codes is canceled by dis-
connecting the negative battery terminal for ap-
prox. five seconds.
79G07C-063
7B-17

TROUBLESHOOTING (G4A-EL) 7B
79G07C-068

Drive at 50
km/h
(31
mph)
Kick-down
Stop
the
vehicle
79G07C-069
After-repair Procedure
1. Cancel the memory of malfunctions by disconnect-
ing the negative battery terminal for at least five sec-
onds, then reconnect it.
2. Remove the EC-AT tester if it is connected.
3. Drive the vehicle at 50 km/h (31 mph), then de-
press the accelerator pedal fully to activate kick-
down. Stop the vehicle gradually.
KICK goimsv
BRAKE LIGHTS*
CRUISE CONTROL
C V,. DEPRESS FULL*
Ox
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ORUti rpn
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£ZL ofF

4. Reconnect the EC-AT tester to the 6-pin service
connector.
5. Ground the 1 -pin service connector with a jumper
wire.
6. Turn the ignition switch ON.
7. Check that no code numbers are displayed.
79G07C-070
Inspection Procedure
No. 06 code display (Vehicle speed sensor)
76G07B-017
7B-19

7B TROUBLESHOOTING (G4A-EL)
No. 12 code display (Throttle sensor)
76G07B-018
No. 55 code display (Pulse generator)
Is there poor connection at connector? YES Repair or replace.
NO
Does EC-AT Tester display drum speed? (Refer to STEP 3-Signal Inspection)
YES Pulse generator OK.
Cancel memory of code number.
NO
NO Is there 200—400 12 between terminals of pulse generator connector? (Refer to page 7B—68)
NO Replace pulse generator. Is there 200—400 12 between terminals of pulse generator connector? (Refer to page 7B—68)
YES YES Check for open or short-circuit in wiring. Check for open or short-circuit in wiring.
76G07B-019
No. 60, 61, 62, or 64 code display (1-2 shift, 2-3 shift, or 3-4 shift solenoid valve)
7B-20

7B TROUBLESHOOTING (G4A-EL)
STEP 3 (SIGNAL INSPECTION)
In this step, the input and output signals are checked
with the EC-AT Tester.
The Tester checks for proper operation of the vari-
ous switches and sensors in the EC-AT system. It also
checks the control unit for output of the various con-
trol signals. Powertrain slippage is also checked.
Inspection Procedure
1. Disconnect the connectors from the EC-AT con-
trol unit.
2. Connect the adaptor harness between the control
unit and the connectors.
3. Turn the ignition switch and main switch ON.
4. Check indication of the respective light or digital
display in each condition, referring to the indica-
tion table below.
Indication table of light and digital display
Item Indication Condition Possible cause
Input (Light)
L ON L range L OFF Other ranges
S
ON S range
INHIBITOR
S OFF Other ranges Inhibitor switch or wiring SW
D ON D range
Inhibitor switch or wiring
D
OFF Other ranges
P,N
ON P or N range P,N OFF Other ranges
HOLD SW ON Hold switch pushed Hold switch or wiring HOLD SW
OFF Hold switch released
Hold switch or wiring
MODE SW ON Power mode Mode switch or wiring MODE SW
OFF Economy mode
Mode switch or wiring
IDLE SW ON Throttle valve fully closed Idle switch or wiring IDLE SW
OFF Throttle valve open
Idle switch or wiring
7B-24

TROUBLESHOOTING (G4A-EL) 7B
Item Indication Condition Possible cause
BRAKE LIGHT SW ON Brake pedal depressed Brake light switch or
wiring BRAKE LIGHT SW
OFF Brake pedal released
Brake light switch or
wiring
WATER TEMP SW ON Coolant temperature 72°C (162°F) or above Water temp switch or wiring WATER TEMP SW
OFF Coolant temperature lower than 65°C (149°F)
Water temp switch or wiring
ATF TEMP SW ON ATF temperature 150°C (302°F) or above Fluid temperature switch or wiring ATF TEMP SW
OFF ATF temperature lower than 143°C (289°F)
Fluid temperature switch or wiring
CRUISE CONTROL SW Not used — —
Input (Digital display)
THROTTLE SENSOR
EC-AT control unit terminal voltage All the time Throttle sensor, idle switch or wirings
VEHICLE SPEED*
Vehicle speed calculated from speed sensor signal
All the time Vehicle speed sensor, speedometer cable, or wiring
DRUM SPEED* Drum speed All the time Pulse generator or wirings
Output (Light)
1-2 SOLENOID VALVE*
ON
Refer to page 7B—26 solenoid valve operation table
Control unit, 1-2 shift sol., or wiring 1-2 SOLENOID VALVE* OFF
Refer to page 7B—26 solenoid valve operation table
Control unit, 1-2 shift sol., or wiring
2-3 SOLENOID VALVE*
ON Refer to page 7B—26 solenoid valve operation table Control unit, 2-3 shift sol., or wiring 2-3 SOLENOID VALVE* OFF
Refer to page 7B—26 solenoid valve operation table Control unit, 2-3 shift sol., or wiring
3-4 SOLENOID VALVE*
ON
Refer to page 7B—26 solenoid valve operation table
Control unit, 3-4 shift sol., or wiring 3-4 SOLENOID VALVE* OFF
Refer to page 7B—26 solenoid valve operation table
Control unit, 3-4 shift sol., or wiring
LOCK-UP SOLE-NOID VALVE*
ON Lock-up condition Control unit, lock-up sol., or wiring LOCK-UP SOLE-NOID VALVE* OFF Non-lock-up condition
Control unit, lock-up sol., or wiring
HOLD INDICATOR ON Hold mode Control unit, Hold switch, or wiring HOLD INDICATOR OFF Other modes
Control unit, Hold switch, or wiring
MODE INDICATOR ON Power or economy mode Control unit, hold switch, mode switch, or wiring MODE INDICATOR
OFF Hold mode
Control unit, hold switch, mode switch, or wiring
NO LOAD SIGNAL Not used — —
76G07B-028
7B-25

7B TROUBLESHOOTING (G4A-EL)
STEP 7 (ROAD TEST)
This step is performed to inspect for problems at the various ranges. If these tests show any problems,
adjust or replace by referring to the electronic system component or mechanical sections.
Caution
Perform the test at normal ATF operating temperature (50—80°C, 122—176°F).
D Range Test
Shift point, shift pattern, and shift shock
1. Shift the selector lever to D range and select the Power mode.
2. Accelerate the vehicle with half and full throttle valve opening.
Note
Throttle sensor voltage of the EC-AT Tester represents the throttle valve opening.
3. Check that 1-2, 2-3 and 3-OD up-shifts and downshifts and lock-up are obtained. The shift points
must be as shown in the D range (Power) shift diagram.
Note
a) Drum speed (rpm) of the EC-AT Tester represents the shift point.
b) Vehicle speed of the EC-AT Tester and speedometer and vehicle speed on a chassis
roller may not meet the specified shift pattern because of tire size. Therefore, check
the shift points with the Drum speed.
c) There is no lock-up when the coolant temperature is below 72°C (162°F).
d) There is no overdrive when the cruise control is operating and there is a 3 km/h (1.9
mph) difference between the pre-set cruise speed and vehicle speed, or set or resume
switch is ON.
e) There is no lock-up when the brake pedal is depressed.
4. Check the up-shifts for shift shock or slippage in the same manner.
5. While driving in OD, shift the selector lever to S range and check that 4-3 downshift immediately
occurs, then decelerate and check that engine braking effect is felt in only 3rd gear.
7B—34

7B TROUBLESHOOTING (G4A-EL)
Evaluation
Condition Possible Cause
No 1-2 up- or down-shift Stuck 1-2 shift solenoid valve
Stuck
1
-2 shift valve
No 2-3 up- or down-shift Stuck 2-3 shift solenoid valve Stuck 2-3 shift valve
No 3-OD up- or down-shift Stuck 3-4 shift solenoid valve Stuck 3-4 shift valve
No lock-up shift Stuck lock-up control solenoid valve Stuck lock-up control valve
Incorrect shift point Mis-adjusted throttle sensor Sticking shift valves
Excessive shift shock or slippage
Excessive shift shock Stuck accumulators Stuck or no one-way check orifice
Worn clutches, brakes, or one-way clutch
No engine braking effect Worn clutches or brakes
76G07B-035
Noise and vibration
Drive the vehicle in OD (lock-up), OD (no lock-up), 3rd (Hold) 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.
Kick-down
Drive the vehicle in OD, 3rd and 2nd gears and check that kick-down occurs for OD->3, OD->2, OD->1,
3->2, 3-+1, 2-> 1, and the shift points are as shown in the shift diagram.
S Range Test
Shift pattern
1. Shift the selector lever to S range and select the Economy mode.
2. Accelerate the vehicle and check that 1-2 and 2-3 up-shifts and down-shifts are obtained, and that
no overdrive and no lock-up are obtained.
Note
a) Inspections of shift shock and shift point are not necessary because these are the same
as those of the D Range Test.
b)ln S range, the shift patterns for Economy and Power modes are the same.
c) Shift points are the same as those of the D range (Power) shift diagram.
3. While driving in S range (Economy mode) and 3rd gear, select the Hold mode and check that 3rd
gear is held until the 3-2 down-shift point as shown in the S range (Hold) shift diagram is achieved.
4. Accelerate the vehicle with S range (Hold mode) and check that 2nd gear is held.
7B i—36

TROUBLESHOOTING (G4A-EL) 7B
Vehicle Speed at Gearshift Table
Mode Range Throttle condition (Throttle sensor voltage) Shifting Drum speed rpm Vehicle speed km/h (mph)
Di -» D2 4930-5480 54-60 (33-37)
Fully opened (4.3 volt) D2 D3 5120—5520 102-110 (63—68)
D3 - OD 5380-5710 165-175 (102—109)
Di -»• D2 3470-4180 38-45 (24-28)
D2 -» D3 4020—4420 80—88 (50—55)
D3 - OD 3820-4530 117-139 (73-86)
Half throttle (1.6—2.2 volt)
Lock-up
ON (OD) 2670-3170 117-139 (73-86)

Powe

Lock-up OFF (OD) 2510-2970 110—130 (68—81)
OD - D3 2150-2630 94-115 (58-71)
D3 ->• D2 2020-2410 62—74 (38—46)
OD - D3 3490—3720 153—163 (95-101)
OD - D2 2050-2240 90-98 (56-61)
Kick-down OD -> Di 980-1120 43-49 (27-30) Kick-down D3 -<• D2 2940-3200 90-98 (56-61)
D3 -»• Di 1400-1500 43—46 (27—29)
D D2 -> Di 2160-2300 43—46 (27-29) D Di -»• D2 4470-5020 49—55 (30-34)
Fully opened (4.3 volt) D2 - D3 4770—5170 95-103 (59-64)
D3 -» OD 5380-5710 165-175 (102-109)
Di -> D2 2830-3380 31-37 (19-23)
D2 D3 2960-3120 59-68 (37-42)
D3 - OD 2870-3460 88-106 (55—66)
>. E o c o o
Half throttle (1.6-2.2 volt)
Lock-up
ON (OD) 2010-2420 88-106 (55-66) >. E o c o o
Lock-up OFF (OD) 1940-2310 85-101 (53-63)
LU OD - D3 1600-1960 70-86 (43-53)
D3 -> D2 1240-1570 38-48 (24—30)
OD ->• D3 3490-3720 153-163 (95-101)
OD - D2 1960—2150 86-94 (53-58)
Kick-down OD - Di 980-1120 43-49 (27-30) Kick-down D3 -> D2 2800-3070 86-94 (53-58)
D3 -> Di 1400—1600 43—49 (27—30)
D2 Di 2160-2460 43—46 (27—30)
S1 - S2 4930-5480 54-60 (33-37)
Fully opened (4.3 volt)
S2 - S3 5120-5520 102—110 (63-68) Fully opened (4.3 volt) S4 -» S3 3720-3950 163—173 (101—107) Fully opened (4.3 volt) S3 - S2 2940-3200 90-98 (56-61)
S S2 S1 2160-2310 43-46 (27-29)
S1 - S2 3470-4180 38-45 (24-28)
Half throttle (1.6-2.2 volt) S2 -» S3 4020—4420 80-88 (50-55) Half throttle (1.6-2.2 volt) S4 - S3 3720-3950 163—173 (101-107)
S3 -> S2 2020-2410 62-74 (38-46)
Fully opened (4.3 volt) Li - L2 4930-5480 54-60 (33-37)
L Fully opened (4.3 volt) L2 - Li 2160-2310 43-46 (27-29)
Half throttle (1.6—2.2 volt) Li - L2 3470-4180 38-45 (24-28)
D2 -» D3 850-1160 17-23 (11—14)
0 D D3 ->• D2 230—420 7-13 (4—8)
o OD - D3 3720-3950 163—173 (101—107) I S Fully closed (0.5 volt) S3 - S2 2940-3200 90-98 (56-61)
L L2 - Li 2160—2310 43-49 (27-30)
76G07B-037
7B-39