Mitsubishi Galant (2004+). Manual — part 1116
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-157
CIRCUIT OPERATION
• A 5-volt power supply is applied on the throttle
position sensor (main) power terminal (terminal
No. 5) from the PCM (terminal No. 94).
The ground terminal (terminal No. 3) is grounded
with PCM (terminal No. 95).
.
TECHNICAL DESCRIPTION
• The throttle position sensor (main) outputs volt-
age which corresponds to the throttle valve open-
ing angle.
• The PCM checks whether the voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor (main) 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
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-158
DTC SET CONDITIONS
Logic Flow Chart
.
Check Condition
• Ignition switch is "ON" position.
Judgement Criteria
• Throttle position sensor (main) output voltage
should be 0.35 volt or less for 0.5 second.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Throttle position sensor failed.
• Open or shorted throttle position sensor (main)
circuit, harness damage, or connector damage.
• PCM failed.
START
YES
YES
YES
NO
NO
NO
CONTINUOUS
FAILURE FOR 0.5sec
MALFUNCTION
END
GOOD
OUTPUT VOLTAGE
< =0.35V
OUTPUT VOLTAGE > =4.8V
AK302389
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-159
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness
STEP 1. Using scan tool MB991958, check data list item 79:
Throttle Position Sensor (main).
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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only
terminals No. 3, No. 4, No. 5, and No. 6.
(6) Set scan tool MB991958 to the data reading mode for item
79, Throttle Position Sensor (main).
• Output voltage should be between 0.3 and 0.7 volt when
the throttle valve is fully closed with your finger.
• Output voltage should be between 4.0 volts or more
when the throttle valve is fully open with your finger.
(7) 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
NO : Go to Step 2.
STEP 2. Check harness connector B-06 at throttle position
sensor 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 11.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-160
STEP 3. Measure the sensor supply voltage at throttle
position sensor harness side connector B-06.
(1) Disconnect the connector B-06 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 5 and ground.
• Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Check harness connector B-22 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
1
6 5 4 3 2
AK303045
B-06 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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