Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 85

13D-20
Code No. 25 Barometric pressure sensor system
Range of Check
D Ignition switch: ON
D Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
D Battery voltage is 8 V or more.
Set conditions
D Sensor output voltage is 4.5 V or more (corresponding to a barometric pressure
of 114 kPa or more) for 4 seconds.
or
D Sensor output voltage is 0.2 V or less (corresponding to a barometric pressure
of 5.33 kPa or less) for 4 seconds.
Measure at the air flow sensor con-
nector A-07.
D Connect the connector. (Use
the test harness: MB991709)
D Voltage between 2 and earth
(Ignition switch: ON)
OK: 3.7 - 4.3 V (Altitude: 0 m)
3.2 - 3.8 V (Altitude:
1,200 m)
OK
Measure at the engine-ECU
connector B-51 <M/T> or the
engine-A/T-ECU connector
B-112 <A/T>.
D Connect the connector.
D Voltage between 85 <M/T>, 55
<A/T> and earth (Ignition
switch: ON)
OK: 3.7 - 4.3 V (Altitude: 0 m)
3.2 - 3.8 V (Altitude:
1,200 m)
OK
Check the following connector:
B-51 <M/T>, B-112 <A/T>
OK
Check trouble symptom.
NG
Replace the engine-ECU <M/T>
or engine-A/T-ECU <A/T>.
MPI -
Troubleshooting
NG
Measure at the air flow sensor con-
nector A-07.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8 - 5.2 V
D Continuity between 5 and earth
OK: Continuity
OK
Check the following connector:
A-07
OK
Check trouble symptom.
NG
Check the harness wire between
the engine-ECU <M/T> or engine-
A/T-ECU <A/T> and the baromet-
ric pressure sensor connector.
NG
Check the harness wire between
the engine-ECU <M/T> or engine-
A/T-ECU <A/T> and the baromet-
ric pressure sensor connector, and
repair if necessary.
NG
Repair
Probable cause
D Malfunction of the barometric pressure sensor
D Improper connector
short-circuited harness wire of the barometric pressure
sensor circuit
D Malfunction of
engine-A/T-ECU <A/T>
NG
Check the following connector:
B-51 <M/T>, B-112 <A/T>
OK
Check trouble symptom.
NG
Check the harness wire between
the engine-ECU <M/T> or engine-
A/T-ECU <A/T> and the baromet-
ric pressure sensor connector.
OK
NG
Repair
Replace the engine-ECU <M/T>
or engine-A/T-ECU <A/T>.
NG
Repair
OK
Replace the air flow sensor.
contact, open circuit
the engine-ECU <M/T>
NG
Repair
NG
Repair
or
or