Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1151

13A-14
From the previous page
OK
Measure at the B-31 air flow sensor
connector.
D Using the test harness
(MB991709), connect the
connector, and measure at the
pickup.
D Ignition switch: ON
D Voltage between terminal No. 7
and earth.
OK: 7 - 8 V
OK
Measure at the B-31 air flow sensor
connector.
D Using the test harness
(MB991709), connect the
connector, and measure at the
pickup harness.
D Voltage between terminal No. 7
and earth.
OK: Engine: idle
0 - 1 V
Engine: 3,000 r/min
6 - 9 V
OK
Measure the output waveform at the
B-31 air flow sensor connector (using
an analyzer).
D Using the test harness
(MB991709), connect the
connector, and measure at the
pickup harness.
D Engine: Idle
D Voltage between terminal No. 3
and earth.
OK: Output the waveform as
shown on P.13A-112 (in-
spection procedure by ana-
lyzer), and check that there
is noise in the output wave-
form.
OK
MUT-II Data list
D No. 12 Air flow sensor
(Refer to P.13A-102.)
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
MPI -
Troubleshooting
NG
Check the following connector:
C-126
Check the harness between the air
flow sensor and engine-ECU.
D Check for short-circuit of the
reset signal wire.
Replace the air flow sensor.
NG
Check the following connector:
C-126
Check the harness between air flow
sensor and engine-ECU.
D Check for disconnection and
damage of the reset signal wire.
MUT-II Data list
D No. 12 Air flow sensor
(Refer to P.13A-102.)
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
Replace the air flow sensor.
Check the trouble symptom.
Check the following connectors:
B-11X, C-115
Check the harness between the air
flow sensor and engine control relay.
D Check for damage of the power
cable.
Check the harness between the air
flow sensor and engine-ECU.
D Check for damage of the output
wire.
D Check for damage of the earth
wire.
NG
Replace engine-ECU.
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
OK
NG
NG
OK
NG
OK
Repair
Repair
Repair
Repair
Replace engine-ECU.
End
Repair
Repair