Mazda MX-5 1990 Workshop Manual page 157

THROTTLE
SENSOR
POWER
TERMINAL
SEND SIGNAL
TO ECU
WHEN PEDAL
DEPRESSED
HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
5V)
LOW VOLT-
AGE SIGNAL
TO
ECU
(APPROX.
OV)
1
HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
5V)
OFF
- - - - - - - -
THROTTLE
SENSOR
IDLE
TERMINAL
SIGNAL
HAS NO
EFFECT
ON ECU
LOW VOLT-
AGE SIGNAL
TO ECU (BE-
LOW 1.5V)
HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
12V)
LOW
VOLTAGE
SIGNAL
TO ECU
(APPROX.
OV)
1
OFF
AIC
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
AlC
SWITCH
ON:
SENDS
SIGNAL
TO ECU
(APPROX.
OV)
AIC
SWITCH
OFF: NO
SIGNAL
TO ECU
(APPROX.
12V)
OFF
TROUBLESHOOTING GUIDE
NEUTRAL
AND
CLUTCH
SWITCHES
SIGNAL
HAS NO
EFFECT
ON ECU
IN NEUTRAL:
LOW VOLT-
AGE SIGNAL
TO ECU (AP-
PROX.OV)
DRIVING
IN ANY
GEAR:
HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
12V)
STOp·
LIGHT
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
NO
SIGNAL
TO ECU
(BELOW
i.5V)
BRAKE
PEDAL
1----1..--1
DEPRESS-
IN NEU-
TRAL:
LOW
VOLTAGE
SIGNAL
TO ECU
(APPROX.
OV)
OFF
ED:
SENDS
SIGNAL
TO ECU
(APPROX.
12V)
t
OFF
SWITCHES
HEAD·
LIGHT
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
HEAD-
LIGHT
SWITCH
ON: HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
12V)
HEAD-
LIGHT
SWITCH
OFF:
LOW
VOLTAGE
SIGNAL
TO ECU
(BELOW
1.5V)
OFF
BLOWER
CONTROL
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
BLOWER
CONTROL
SWITCH
ON: LOW
VOLTAGE
SIGNAL
TO ECU
(APPROX.
OV)
BLOWER
CONTROL
SWITCH
OFF:
HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
12V)
OFF
COOLING
FAN
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
COOLING
FAN
SWITCH
ON: LOW
VOLTAGE
SIGNAL
TO ECU
(APPROX.
OV)
COOLING
FAN
SWITCH
ON: HIGH
VOLTAGE
SIGNAL
TO ECU
(APPROX.
12V)
OFF
PIS PRES·
SURE
SWITCH
SIGNAL
HAS NO
EFFECT
ON ECU
STEER-
ING
WHEEL
TURNED:
LOW
VOLTAGE
SIGNAL
TO ECU
(APPROX.
OV)
STEER-
ING
WHEEL
STRAIGHT
AHEAD:
HIGH
VOLTAGE
TO ECU
(APPROX.
12V)
OFF
IGNITION
SWITCH
START
POSITION
SENDS
SIGNAL
TO ECU
NO
SIGNAL
TO ECU
(BELOW
i.5V)
OFF
F
TEST
TERMINAL
SIGNAL
HAS NO
EFFECT
ON ECU
TERMINAL
NOT
GROUND-
ED: HIGH
VOLTAGE
TO ECU
(APPROX.
12V)
LOW VOLT-
AGE SIGNAL
TO ECU
WHEN CON-
NECTOR
GROUNDED
(BELOW
1.5V)
OFF
05UOFX-010
F-13