Mitsubishi Montero (2004+). Manual — part 165
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-147
DTC P0123: Throttle Position Sensor (Main) Circuit high Input
.
CIRCUIT OPERATION
• A 5-volt power supply is applied on the throttle
position sensor (main) power terminal (terminal
No. 2) from the PCM (terminal No. 106).
The ground terminal (terminal No. 4) is grounded
with PCM (terminal No. 105).
• When the throttle valve shaft is turned from the
idle position to the fully opened position, the
resistance between the throttle position sensor
(main) output terminal (terminal No. 1) and
ground terminal (terminal No. 4) will increase
according to the rotation.
.
AK201130
RED
WHITE
BLA
CK
B-05
5 V
106
2
THROTTLE
POSITION
SENSOR
(MAIN)
POWERTRAIN CONTROL MODULE (PCM)
115
105
1
4
Throttle Position Sensor (Main) Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
6
1 2 3 4 5
AK201173
THROTTLE
POSITION
SENSOR
AB
B-05(B)
CONNECTOR: B-05
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-148
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
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Ignition switch "ON" position.
Judgement Criteria
• Throttle position sensor (main) output voltage
should be 4.8 volts or more for 0.5 second.
START
YES
YES
YES
NO
NO
NO
CONTINUOUS
FAILURE FOR 0.5sec
MALFUNCTION
END
GOOD
OUTPUT VOLTAGE
< =0.35V
OUTPUT VOLTAGE > =4.8V
AK302926
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-149
.
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, har-
ness damage, or connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MB991658: Test Harness Set
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. 1, No. 2, No. 3, and No. 4.
(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
NO : Go to Step 2.
STEP 2. Check harness connector B-05 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 8.
AK302970
AB
MB991911
MB991824
MB991827
AK201174
1
6 5 4 3 2
B-05(B)
CONNECTOR: B-05
HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-150
STEP 3. Check the continuity at throttle position sensor
harness side connector B-05.
(1) Disconnect the connector B-05 and measure at the harness
side.
(2) Measure the continuity between terminal No. 4 and ground
• Should be less than 2 ohms.
Q: Dose continuity exist?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Check harness connector D-135 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 8.
AK201174
1
6 5 4 3 2
B-05(B)
CONNECTOR: B-05
HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK201446
1
6 5 4 3 2
AB
B-05 HARNESS
CONNECTOR:
COMPONENT SIDE
AK200947
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст