Mitsubishi Lancer Evolution X. Manual — part 264
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-121
DTC P0098: Intake Air Temperature Circuit High Input (sensor 2)
.
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.
.
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
AK704235 AB
Connector: B-10
ECM
B-10 (GR)
AK704400
AB
Connector: B-16
B-16 (B)
Intake air temperature
sensor 2
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-122
DESCRIPTIONS OF MONITOR METHODS
Intake air temperature sensor 2 output voltage is out
of specified range.
.
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)
• Not applicable
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Condition
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criterion
• Intake air temperature sensor 2 output voltage
has continued to be 4.6 volts or higher [corre-
sponding to an intake air temperature of − 40° C
(− 40° F) or lower] for 2 seconds.
.
Output voltage < 0.2V
Output voltage > 4.6V
End
No
No
No
Malfunction
Good
No
AK604315
Start
Yes
Yes
Yes
Yes
Continuous
failure for 2secs
Monitoring
conditions
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-123
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 23
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Intake air temperature sensor 2 failed.
• Open intake air temperature sensor 2 circuit, or
connector damage.
• ECM failed.
DIAGNOSIS
Required Special Tools
• MB992110: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check data list item
DE: Intake Air Temperature Sensor 2.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item
DE, Intake Air Temperature Sensor 2.
• The intake air temperature and temperature shown with
the scan tool should approximately match.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : 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
.
NO : Go to Step 2.
STEP 2. Check harness connector B-16 at the intake air
temperature sensor 2 for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 10.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-124
STEP 3. Check the intake air temperature sensor 2.
(1) Disconnect the intake air temperature sensor 2 connector
B-16.
(2) Measure the resistance between intake air temperature
sensor 2 side connector terminal No. 1 and No. 2.
• There should be continuity. (0.23 − 18 kΩ)
Q: Is the measured resistance between 0.23 and 18 kΩ?
YES : Go to Step 4.
NO : Replace the intake air temperature sensor 2. Then go
to Step 10.
STEP 4. Measure the sensor supply voltage at intake air
temperature sensor 2 harness side connector B-16.
(1) Disconnect the connector B-16 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 10.
AK704080
2
1
AB
Intake air temperature
sensor 2 connector
AK704402
1
2
AB
B-16 harness
connector:
component side
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