Mitsubishi Galant (2004+). Manual - part 806

 

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Mitsubishi Galant (2004+). Manual - part 806

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-41

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC P0101: Mass Airflow Circuit Range/Performance Problem

CAUTION

If DTC P0101 has been set, TCL related DTC 
U1120 is also set. After P0101 has been diag-
nosed, don't forget to erase DTC U1120.

1

2

3

4

1

2

3 4

52

51

53 54 55 56

57

58 59 60 61 62

63

64 65 66 67 68 69

70

71 72 73 74 75

76

77 78 79 80 81 82

83

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

AK303801

RED

WHITE-GREEN

BLA

CK

RED-
WHITE

RED-

WHITE

B-10

B-17X

MFI 
RELAY

BATTERY

MASS AIRFLOW 
SENSOR

HET 
SENSITIZING
RESISTANCE

POWERTRAIN CONTROL 
MODULE (PCM)

108

3

69

2

1

2

4

4

3

Mass Airflow Sensor Circuit

B-21

B-22

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-42

.

CIRCUIT OPERATION

• The mass airflow sensor power is supplied from 

the MFI relay (terminal No. 4), and the ground is 
provided on the PCM (terminal No. 69).

• A voltage that is according to the mass airflow 

rate is sent to the PCM (terminal No. 108) from 
the mass airflow sensor output terminal (terminal 
No. 3).

.

TECHNICAL DESCRIPTION

• While the engine is running, the mass airflow 

sensor outputs voltage which corresponds to the 
mass airflow rate.

• The PCM checks whether the voltage output by 

the mass airflow sensor while the engine is run-
ning is within a specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Compare load value with mass airflow sensor output 

voltage.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Throttle position sensor

.

AK303802AB

CONNECTOR: B-10

MASS AIRFLOW SENSOR
(WITH BUILT-IN INTAKE AIR 
TEMPERATURE SENSOR)

B-10 (GR)

AK303013

CONNECTORS: B-21, B-22

PCM

AB

AIR CLEANER

B-22 (B)

B-21 (B)

AK303803AB

CONNECTOR: B-17X

MFI RELAY

B-17X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-43

DTC SET CONDITIONS <Range/Performance problem 

 high input> 

Logic Flow Chart

Check Conditions

• Throttle position sensor output voltage is 1.0 volt 

or lower.

• Mass airflow sensor output voltage is 4.9 volts or 

lower.

Judgement Criteria

• Mass airflow sensor output voltage has continued 

to be 3.5 volts or higher for 2 seconds.

.

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2secs

OUTPUT VOLTAGE

> =3.50V

MONITORING

CONDITIONS

AK302006

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-44

DTC SET CONDITIONS <Range/Performance problem 

 low input> 

Logic Flow Chart

Check Conditions

• Throttle position sensor output voltage is 1.5 volts 

or higher.

• Mass airflow sensor output voltage is 0.2 volt or 

higher.

Judgement Criteria

• Mass airflow sensor output voltage has continued 

to be 1.82 volts or lower for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

 Other Monitor 

P.13A-5

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Mass airflow sensor failed.

• Mass airflow sensor circuit harness damage, or 

connector damage.

• PCM failed. 

START

END

NO

YES

YES

YES

NO

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2secs

OUTPUT VOLTAGE

< =1.82V

MONITORING

CONDITIONS

AK302007

 

 

 

 

 

 

 

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