Mitsubishi Pajero Pinin. Manual — part 107
MPI <4G9> –
Troubleshooting
13C-14
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. P0100 Air flow sensor system
Probable cause
Range of Check
D
Engine speed: 500 r/min or more
Set Conditions
D
The sensor output frequency is 3.3 Hz or less for 4 seconds.
D
Malfunction of air flow sensor
D
Open or short circuit in air flow sensor circuit or
loose connector contact
D
Malfunction of engine-ECU
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
(3) NG
Check the following connectors:
A-36, C-88
NG
Repair
OK
To the next page
Check the harness between the air
flow sensor and the engine control
relay, and repair if necessary.
(2) NG
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
NG
Check the following connector:
C-90
NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
NG
Repair
OK
Check the following connector:
C-90
(1) NG
Measure at engine-ECU connector
C-90.
D
Measure the voltage at the
engine-ECU terminal.
D
Ignition switch: ON
D
Voltage between terminal 90 and
earth
OK: 4.8 – 5.2 V
OK
Measure at air flow sensor
connector A-71.
D
Disconnect the connector and
measure at the harness side.
(1) Voltage between terminal 3 and
earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
(2) Voltage between terminal 4 and
earth (Ignition switch: ON)
OK: System voltage
(3) Resistance between terminal 5
and earth
OK: 2
Ω
or less
NG
Check the following connector:
A-71
NG
Repair
MUT-
II
Data list
12 Air flow sensor (Refer to
P.13C-74, DATA LIST
REFERENCE TABLE.)
OK
Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
MPI <4G9> –
Troubleshooting
13C-15
Check the harnesses between the
air flow sensor and the engine-ECU
and between the air flow sensor
and the engine control relay, and
repair if necessary.
OK
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
NG
Check the following connectors:
A-71, C-90
NG
Repair
Check the trouble symptoms.
NG
Replace the air flow sensor.
OK
Measure the output waveform at air
flow sensor connector A-71 (by
using an analyzer).
D
Use test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
D
Engine: Idling
D
Voltage between terminal 3 and
earth
OK: Waveforms should be dis-
played on P.13C-87 (In-
spection Procedure Using
an Analyzer) and noise
should not be displayed in
the waveform.
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
NG
Check the following connector:
A-71
NG
Repair
OK
Measure at air flow sensor
connector A-71.
D
Use test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
D
Voltage between terminal 7 and
earth
OK: Engine: Idling
0 – 1 V
Engine speed: 3,000 r/min
6 – 9 V
OK
Replace the air flow sensor.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
NG
Check the following connector:
A-71
NG
Repair
OK
Measure at air flow sensor
connector A-71.
D
Use test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
D
Ignition switch: ON
D
Voltage between terminal 7 and
earth
OK: 7 – 8 V
From the previous page
MPI <4G9> –
Troubleshooting
13C-16
Code No. P0105 Barometric pressure sensor system
Probable cause
Range of Check
D
Two seconds have passed since the ignition switch is turned ON or the
engine starting process is completed.
D
Battery voltage: 8 V or more
Set Conditions
D
The sensor output voltage is 4.5 V or more for 4 seconds (equivalent to
114 kPa of barometric pressure)
or
D
The sensor output voltage is 0.2 V or less (equivalent to 53 kPa of
barometric pressure)
D
Malfunction of barometric pressure sensor
D
Open or short circuit in barometric pressure
sensor circuit or loose connector contact
D
Malfunction of engine-ECU
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
(2) NG
Check the following connector:
C-90, A-36
NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
NG
Repair
MUT-
II
Data list
25 Barometric pressure sensor
(Refer to P.13C-74, DATA LIST
REFERENCE TABLE.)
OK
Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
NG
NG
Repair
OK
Measure at air flow sensor
connector A-71.
D
Disconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
(2) Resistance between terminal 5
and earth
OK: 2
Ω
or less
(1) NG
Measure at engine-ECU connector
C-90.
D
Measure the voltage at the
engine-ECU terminal.
D
Ignition switch: ON
D
Voltage between terminal 81 and
earth
OK: 4.8 – 5.2 V
OK
Check the following connector:
C-90
NG
Check the following connector:
C-90
NG
Repair
OK
To the next page
Check the following connector:
A-71
MPI <4G9> –
Troubleshooting
13C-17
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
(2) NG
Replace the air flow sensor.
NG
Check the following connector:
C-90
NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
Check the trouble symptoms.
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
From the previous page
OK
Measure at engine-ECU connector
C-90.
D
Measure the voltage at the
engine-ECU terminal.
D
Ignition switch: ON
D
Voltage between terminal 81 and
earth
OK: Altitude 0 m: 3.7 – 4.3 V
Altitude 1,200 m:
3.2 – 3.8 V
NG
Check the following connector:
C-90
NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connector:
C-90
NG
Repair
NG
Replace the engine-ECU.
OK
Measure at air flow sensor
connector A-71.
D
Connect connector terminals No.
1, No. 2 and No. 5 only by using
test harness (MB991709), and
measure at the pick-up harness.
D
Ignition switch: ON
(1) Voltage between terminal 1 and
earth
OK: 4.8 – 5.2 V
(2) Voltage between terminal 2 and
earth
OK: Altitude 0 m: 3.7 – 4.3 V
Altitude 1,200 m:
3.2 – 3.8 V
(3) Voltage between terminal 5 and
earth
OK: 0.5 V or less
(1) NG
Check the following connector:
C-90
NG
Repair
(3) NG
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