Terminal Voltage (Turbo) - Mazda 626 MX-6 Workshop Manual

Terminal Voltage
If the input and output devices and related wiring are normal, but the engine control unit terminal volt­
age is incorrect, replace the engine control unit.
Terminal Input Output Connection to
o
1A Malfunction indicator
light
o
1B Self-Diagnosis
Checker (Code
number)
o
1C Solenoid valve
(Waste gate)
0
Self-Diagnosis
1D
Checker (Monitor
lamp)
O
Idle switch
1E
o
1F A/C relay
—
1G
—
o
1H Water thermo switch
o
Electrical load con­
1 1
trol unit
o
Brake light switch
1J
0
P/S pressure switch
1K
o
A
1L 1C
o
Igniter (IGf signal)
1M
o
Distributor (G1 ©
1N
signal)
Voltage (After warming-up)
IGN: ON
For 3 sec. after ignition switch OFF -> ON:
below 4.8V (Light illuminates)
After 3 sec.: Battery voltage (Light does not
illuminate)
For 3 sec. after ignition switch OFF -> • ON:
below 6.2V (Buzzer sounds)
After 3 sec.: Battery voltage
(Buzzer does not sound)
Test connector
grounded
For 3 sec. after igni­
tion switch OFF -> •
ON:
below 6.2V (Light il­
luminates)
After 3 sec.: Battery
voltage (light does
not illuminate)
Accelerator pedal released: below 0.5V
Accelerator pedal depressed: above 7.7V
Battry voltage
—
Electrical load ON: below 1.5V
Electrical load OFF: above 7.3V
Brake pedal released: below 3.6V
Brake pedal depressed: above 10.0V
Constant above
10.5V
switch A/C switch ON: below 1.5V
A/C switch OFF: above 10.0V
Below 1.0V
626, MX-6 Revised 10/87
CONTROL-SYSTEM
Idle
Battery voltage
(Test connector
grounded)
approx. 5V
(Test connector not
grounded)
Monitor lamp ON:
below 6.2V
Monitor lamp OFF:
Battery voltage
A/C switch ON:
below 2.5V
A/C switch OFF:
battery voltage
—
Above 7.3V
Below 1,5V
P/S ON: below 1.5V
P/S OFF: above 10.5V
Approx. 0.6—0.8V
4B
Remarks
• Test connector
grounded
• Light illuminates:
below 4.8V
• Light does not il­
luminate: Battery
voltage
• Using Self-
Diagnosis Check­
er and test con­
nector grounded
• Buzzer sounds:
below 6.2V
• Buzzer does not
sound: Battery
voltage
• Suddenly increase
e n g in e sp e e d to
above 4,500 rpm:
below 3.5V
With Self-Diagnosis
Checker
Blower motor:
ON
—
Radiator temp.: be­
low 17°C (63°F)
Radiator temp.:
above 17°C (63°F)
Electrical load:
Rear defroster
Headlight
Blower motor (3rd &
4th position)
Electrical fan
Blower motor: ON
4B-105