Terminal Voltage - Mazda 626 MX-6 Workshop Manual

4A
CONTROL SYSTEM

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)
1C
— —
o
1D Self-Diagnosis
Checker (Monitor
lamp)
O
1E Idle switch
o
1F
A/C relay
1G —
—
o
1H Water thermo switch
o
1 1 Electrical load con­
trol unit
o
1J Brake light switch
o
1K P/S pressure switch
o
1L A/C switch
o
1M Ignition coil ©
terminal
1N —
—
4A—90
Voltage (After warming-up)
IGN: ON
For 3sec. after ignition switch OFF -* ON:
below 4.8V (light illuminates)
After 3sec.: Battery voltage (light does not
illuminate)
For 3sec. after ignition switch OFF -» ON:
below 6.2V (Buzzer sounds)
After 3sec.: Battery voltage
(Buzzer does not sound)
—
Tos' connector
grounded
For 3sec. after igni­
tion switch OFF -+
ON:
below 6.2V (light il­
luminates)
After 3sec.: 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
A/C switch ON: below 1,5V
A/C switch OFF: above 10.0V
Battery voltage
—
626, MX-6 Revised 10/87
Idle
■ s
(Test connector
grounded)
approx. 5V
(Test connector not
grounded)
Monitor lamp ON:
below 6.2V
Monitor lamp OFF:
Battery voltage
A/C switch ON: be­
low 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
*1 Battery voltage
Remarks
• Test connector
grounded
• Light illuminate:
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
—
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
*1 Engine Signal
Monitor: green and
red lights flash
—