Mitsubishi Montero Sport (2004+). Manual — part 186
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-157
DTC P0123: Throttle Position Sensor Circuit High Input
5V
GREEN-
YELL
OW
BL
ACK
GREEN-
WHITE
GREEN-
WHITE
BL
ACK
AK000443
Throttle Position Sensor (TPS) Circuit
POWERTRAIN CONTROL MODULE (PCM)
71
76
77
72 73 74
75
79 80
78
81
87 88
89
91
90
92
97
98
82
93
83
94
84 85
95
86
96
C-91
(MU803782)
1 2 3 4
A-41
(MU802724)
THROTTLE POSITION SENSOR
13
12
78
57
3
1
4
C-90
46
47
41
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58
59
60 61 62 63
64 65 66
C-90
(MU803781)
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-71
AUTO-CRUISE CONTROL SYSTEM
C-91
JOINT
CONNEC-
TOR (4)
AK000363
AK104024
CONNECTOR: A-41
AB
THROTTLE
POSITION
SENSOR
A-41(B)
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-158
.
CIRCUIT OPERATION
• A 5-volt power supply is applied on the TPS
power terminal (terminal No. 4) from the PCM
(terminal No. 46).
The ground terminal (terminal No. 1) is grounded
with PCM (terminal No. 57).
• When the throttle valve shaft is turned from the
idle position to the fully opened position, the
resistor between the TPS output terminal (termi-
nal No. 3) and ground terminal will increase
according to the rotation.
.
TECHNICAL DESCRIPTION
• The TPS outputs voltage which corresponds to
the throttle valve opening angle.
• The PCM checks whether the voltage is within a
specified range. In addition, it checks that the
voltage output does not become too high while
the engine is at idle.
.
DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor output voltage is out of spec-
ified 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
.
AK103912AB
CONNECTOR: C-71
C-71
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-159
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
• Engine speed is lower than 1,000 r/min.
• Volumetric efficiency is lower than 60 percent.
Judgement Criteria
• TPS output voltage has continued to be 2 volts or
higher for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• TPS failed.
• Open TPS circuit, or harness damage or connec-
tor damage.
• PCM failed.
START
END
No
No
Yes
Yes
Malfunction
Good
Continuous
Failure for 2secs
Output Voltage
> 2.0V
No
Yes
Monitoring
Conditions
AK302363
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-160
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 14:
Throttle Position Sensor.
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
14, Throttle Position Sensor.
• With the throttle valve in the idle position, voltage should
measure between 0.535 and 0.735 volt.
• With the throttle valve in the full-open position, voltage
should measure between 4.5 and 5.5 volts.
(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
NO : Go to Step 2.
STEP 2. Check connector A-41 at throttle position sensor
for damage.
Q: Is the 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 8.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
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