Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 497

13B-16
Code No.32 Vacuum sensor system
Range of Check
Ignition switch: ON
Set Conditions
The output voltage of the vacuum sensor is 4.5 V or more for 4 seconds. (This
corresponds to the absolute manifold pressure of 115 kPa or more.)
Range of Check
The output voltage of the throttle position sensor is 1.25 V or more.
or
The vehicle is stationary.
Set Conditions
The output voltage of the vacuum sensor is 0.2 V or less for 4 seconds. (This
corresponds to the absolute manifold pressure of 4.9 kPa or less.)
NG
Measure at the vacuum
sensor connector A-59.
Connect the connec-
tor. (Use the test
harness: MB991348)
Voltage between 1
and earth (Engine:
Idling)
OK: 0.9 – 1.5 V
Voltage between 1
and earth
OK: If the accelera-
tor pedal is de-
pressed sud-
denly from idle
speed, the volt-
age increases
momentarily
from 0.9 – 1.5
V.
OK
NG
Measure at the engine-
ECU connector. B-31.
Connect the connec-
tor.
Voltage between 85
and earth (Engine:
idling)
OK: 0.9 – 1.5 V
OK
NG
Check the following
connector: B-31
OK
NG
Check trouble symptom.
MPI –
Troubleshooting
NG
Measure at the vacuum
sensor connector A-59.
Disconnect the con-
nector, and measure
at the harness side.
Voltage between 3
and earth (ignition
switch: ON)
OK: 4.8 – 5.2 V
Continuity between 2
and earth
OK: Continuity
OK
NG
Check the following
connector: A-59
OK
NG
Check trouble symptom.
Check the harness wire
between the engine-ECU
and vacuum sensor con-
nector, and repair if nec-
essary.
Repair
Replace the engine-
ECU.
Range of Check
Malfunction of the vacuum sensor
Improper connector
short-circuited harness
Malfunction of the engine-ECU
NG
Check the following
connector: B-31
OK
Check trouble symptom.
NG
NG
Check the harness wire
between the engine-ECU
and vacuum sensor con-
nector.
OK
Repair
Replace the engine-
ECU.
NG
Check the harness wire
between the engine-ECU
and vacuum sensor con-
nector.
OK
NG
Check the vacuum hose
between the vacuum sen-
sor and intake manifold.
OK
Replace the vacuum sen-
sor.
contact, open circuit or
Repair
Repair
Repair
Repair