Mitsubishi MOTORS Lancer 2005, Workshop Manual Supplement

Page: 21 / 109

MPI <4G63>
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Troubleshooting
13D-16
OK
Check the harness between the air
flow sensor and engine-A/T-ECU.
NG
OK
Check the harness between the air
flow sensor and engine control relay.
Repair
NG
NG
Check the following connectors:
B-16X, C-122, C-124
Repair
OK
Check the trouble symptom.
End
OK
Intermittent malfunction
(Refer to GROUP 00
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Points to Note
for Intermittent Malfunctions.)
OK
M.U.T.- II/III Data list
D No. 12 Air flow sensor
(Refer to P.13D-66.)
NG
Replace the engine-A/T-ECU.
Replace the air flow sensor.
OK
Intermittent malfunction
(Refer to GROUP 00
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Points to Note
for Intermittent Malfunctions.)
OK
Measure the output waveform at the
B-08 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.13D-79 (in-
spection procedure by ana-
lyzer), and check that there
is noise in the output wave-
form.
NG
OK
M.U.T.-
II/III
Data list
D
No. 12 Air flow sensor
(Refer to P.13D-66.)
NG
Replace the engine-A/T-ECU.
OK
Check the harness between air flow
sensor and engine-A/T-ECU.
NG
Repair
OK
Measure at the B-08 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
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1 V
Engine: 3,000 r/min
6
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9 V
NG
Check the following connector:
C-122
NG
Repair
OK
Replace the air flow sensor.
OK
Check the harness between the air
flow sensor and engine-A/T-ECU.
NG
Repair
OK
Measure at the B-08 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
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8 V
NG
Check the following connector:
C-122
NG
Repair
From the previous page
Code No. 13 Intake air temperature sensor system Probable cause
Range of Check
D 60 seconds after the ignition switch is set to the “ON” position, or after the
completion of the start of engine.
Set Conditions
D The sensor output voltage is more than 4.6 V for 4 seconds (Equivalent to intake
air temperature less than
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40 _ C)
or
D The sensor output voltage is less than 0.2 V for 4 seconds (Equivalent to intake
air temperature of more than 120
_ C)
D Malfunction of the intake air temperature sensor
D Intake air temperature sensor circuit disconnection,
short-circuit, or connector contact defect
D Malfunction of the engine-A/T-ECU