Mitsubishi Lancer Evolution X. Manual - part 261

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-109

STEP 2. Using scan tool MB991958, check data list item 8: 
Manifold Absolute Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item 

8, Manifold Absolute Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 

in.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 

in.Hg).

(3) Start the engine.

• When the engine is idling, 16 − 36 kPa (4.7 − 10.6 in.Hg).
• When the engine is suddenly revved, manifold absolute 

pressure varies.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 3.
NO :  Refer to, DTC P0106 − Manifold Absolute Pressure 

Circuit Range/Performance Problem 

P.13A-145

, DTC 

P0107 − Manifold Absolute Pressure Circuit Low Input 

P.13A-154

, DTC P0108 − Manifold Absolute Pressure 

Circuit High Input 

P.13A-162

.

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Start the engine.
(4) Turn the ignition switch to "LOCK" (OFF) position and then 

wait 2 seconds.

(5) Turn the ignition switch to the "ON" position.
(6) Set scan tool MB991958, read the DTC.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0069 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 4.

NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points − How to 

Cope with Intermittent Malfunctions 

P.00-15

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-110

STEP 4. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Start the engine.
(4) Turn the ignition switch to "LOCK" (OFF) position and then 

wait 2 seconds.

(5) Turn the ignition switch to the "ON" position.
(6) Set scan tool MB991958, read the DTC.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0069 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

DTC P0096: Intake Air Temperature Circuit Range/Performance Problem (sensor 2)

AK704399

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

2

1

2

8

7

6

5

4

3

11

21

20

19

18

17

16

15

14

13

12

9

22

1

10

AB

97

98

INTAKE AIR TEMPERATURE
SENSOR 2

ENGINE CONTROL MODULE

2

1

16

17

5 V

INTAKE AIR TEMPERATURE SENSOR 2 CIRCUIT

GREEN-

RED

GREEN-

RED

BLA

CK-

YELO

W

BLA

CK-

YELO

W

B-16

A-13

(MU802409)

B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-111

.

CIRCUIT OPERATION

• Approximately 5 volts are applied to the intake air 

temperature sensor 2 output terminal (terminal 
No. 1) from the ECM (terminal No. 98) via the 
resistor in the ECM. The ground terminal (termi-
nal No. 2) is grounded with ECM (terminal No. 
97).

• The intake air temperature sensor 2 is a negative 

temperature coefficient type of resistor. When the 
intake air temperature rises, the resistance 
decreases.

• The intake air temperature sensor 2 output volt-

age increases when the resistance increases and 
decreases when the resistance decreases.

.

TECHNICAL DESCRIPTION

• The intake air temperature sensor 2 converts the 

intake air temperature to a voltage.

• The ECM checks whether this voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Intake air temperature sensor 2 output voltage does 

not change when specified go/stop operations 
are repeated.

.

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)

• Engine coolant temperature sensor

.

AK704235 AB

Connector: B-10

ECM

B-10 (GR)

AK704400

AB

Connector: B-16

B-16 (B)

Intake air temperature
sensor 2

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-112

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 76° C 

(169° F).

• Repeat 2 or more times: drive

*1

, stop

*2

.

Drive

*1

: vehicle speed higher than 50 km/h (31 

mph) lasting a total of 60 seconds or more.

Stop

*2

: vehicle speed lower than 1.5 km/h (1.0 

mph) lasting 30 seconds or more.

Judgement Criterion

• Changes in the intake air temperature is lower 

than 1° C (1.8° F).

.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the intake air temperature in the 

intake manifold is 25 ° C.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 7 

P.13A-9

.

.

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

• Intake air temperature sensor 2 failed.
• Harness damage or connector damage.
• ECM failed. 

End

Malfunction

Yes

Yes

No

No

Yes

No

Go/stop operation

for specified times

Intake air temp.

changes

Monitoring

conditions

Good

Start

AK604314