Mitsubishi Montero (2004+). Manual — part 314
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-743
DTC P2122: Accelerator Pedal Position Sensor (Main) Circuit Low Input
.
CIRCUIT OPERATION
• A 5-volt power supply is applied on the APS
(main) power terminal (terminal No. 2) from the
PCM (terminal No. 92).
The ground terminal (terminal No. 1) is grounded
with PCM (terminal No. 91).
• When the accelerator pedal is moved from the
idle position to the fully opened position, the
resistance between the APS (main) output termi-
nal (terminal No. 3) and ground terminal (terminal
No. 1) will increase according to the rotation.
.
TECHNICAL DESCRIPTION
• The APS (main) outputs voltage which corre-
sponds to the accelerator pedal depression.
AK201163
VIOLET
-WHTE
YELLO
W
-RED
BLA
CK
D-138
(MU802073)
5 V
92
2
ACCELERATOR
PEDAL
POSITION
SENSOR
(MAIN)
POWERTRAIN CONTROL MODULE (PCM)
114
91
3
1
Accelerator Pedal Position Sensor (Main) Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
6 7 8
1 2 3 4 5
AK200944
ACCELERATOR
PEDAL
POSITION
SENSOR
AB
D-138(GR)
CONNECTOR: D-138
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-744
• The PCM checks whether the voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Accelerator pedal position sensor (main) output volt-
age 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
• Accelerator pedal position sensor (main) output
voltage is 0.2 volt or less for 1 second.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• APS failed.
• Open or shorted APS (main) circuit, harness
damage, or connector damage.
• PCM failed.
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 1.3sec
OUTPUT VOLTAGE < 0.2V
AK302961
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-745
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 78:
Accelerator Pedal 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) Set scan tool MB991958 to the data reading mode for item
78, Accelerator Pedal Position Sensor (main).
• Output voltage is between 0.905 and 1.165 volts when
foot is released from accelerator pedal.
• Output voltage is 4.035 volts or higher when accelerator
pedal is fully depressed.
(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 D-138 at accelerator pedal
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 12.
AK302970
AB
MB991911
MB991824
MB991827
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-746
STEP 3. Check the accelerator pedal position sensor.
(1) Disconnect the accelerator pedal position sensor connector
D-138.
(2) Measure resistance between terminal No. 1 and No. 2 and
between terminal No. 7 and No. 8.
Standard value: 3.5
− 6.5 kΩ
(3) Measure resistance between terminal No. 2 and No. 3 and
between terminal No. 6 and No. 8.
(4) Move the accelerator pedal from the idle position to the
full-open position.
• Resistance value changes in accordance with the accel-
erator pedal depression smoothly.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the accelerator pedal position sensor. Then
go to Step 12.
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
6 7 8
1 2 3 4 5
AK201450
ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR
AB
6 7 8
1 2 3 4 5
AK201451
ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR
AB
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