Mitsubishi Galant 9G. Manual — part 968
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-172
DTC P0123: Throttle Position Sensor (main) Circuit High Input
CAUTION
If DTC P0123 has been set, TCL related DTC
U1120 is also set. After P0123 has been diag-
nosed, don't forget to erase DTC U1120.
.
6
1 2 3 4 5
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK400878
YELLO
W
-RED
WHITE-RED
BLA
CK-WHITE
B-06
94
5
THROTTLE POSITION
SENSOR (MAIN)
HALL IC
POWERTRAIN
CONTROL
MODULE (PCM)
98
95
6
3
Throttle Position Sensor (main) Circuit
B-22
5 V
AK303042
THROTTLE BODY ASSEMBLY
(INCORPORATING THROTTLE
POSITION SENSOR)
B-06 (B)
CONNECTOR: B-06
AB
AK303043
CONNECTOR: B-22
B-22 (B)
PCM
AB
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-173
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-174
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Ignition switch is "ON" position.
Judgement Criteria
• Throttle position sensor (main) output voltage
should be 4.8 volts or more 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 throttle position sensor (main) circuit, or
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-175
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 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
− How to
Cope with Intermittent Malfunctions
.
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
. Then go to Step 8.
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
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