Mitsubishi Galant. Manual — part 103
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-93
STEP 13. Using scan tool MB991502, check data list item
14: Throttle Position Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item
14, Throttle Position Sensor.
•
With the throttle valve in the idle position, voltage should
be between 0.535 and 0.735 volts.
•
With the throttle valve in the full-open position, voltage
should be 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 : Replace the PCM. Then go to Step 14.
STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor(
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0121 is output?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-94
DTC P0122: Throttle Position Circuit Low Input
CIRCUIT OPERATION
•
A 5-volt power supply is applied on the TPS
power terminal (terminal 4) from the PCM
(terminal 46). The ground terminal (terminal 1) is
grounded with PCM (terminal 57).
•
When the throttle valve shaft is turned from the
idle position to the fully opened position, the
resistor between the TPS output terminal
(terminal 3) and ground terminal will increase
according to the rotation.
AK000463
2 3 4
1
98
78
71
88 89
76 77
72
79
91
73
80
74
75
81
92
8283
93
8485
94
8687
9596
90
97
GREEN-YELLO
W
BR
O
WN-
WHITE
BR
O
WN-
WHITE
BLA
CK
POWERTRAIN CONTROL
MODULE(PCM)
57
78
46
5V
C-40
(MU803781)
C-41
(MU803782)
AUTO-CRUISE
CONTROL SYSTEM
B-05
(MU802724)
THROTTLE POSITION
SENSOR
4
3
1
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58 59
60 61 62 63
64 65 66
47
41
ACX02472
CONNECTOR : B-05
THROTTLE
POSITION
SENSOR
AG
AK000280
CONNECTORS : C-40, C-41
C-41
C-40
PCM
AX
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-95
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.
DTC SET CONDITIONS
Check Conditions
•
Two seconds or more have passed since the
staring sequence was completed.
•
Engine speed is higher than 2,000 r/min.
•
Volumetric efficiency is higher than 60 percent.
Judgement Criteria
•
TPS output voltage has continued to be 0.8 volt
or lower for 2 seconds.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
TPS failed or maladjusted.
•
Open or shorted TPS circuit, or loose connector.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 14:
Throttle Position Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item
14, Throttle Position Sensor.
•
With the throttle valve in the idle position, voltage should
be between 0.535 and 0.735 volts.
•
With the throttle valve in the full-open position, voltage
should be 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 B-05 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 9.
AC003081 AB
16 PIN
MB991502
ACX02472
CONNECTOR : B-05
THROTTLE
POSITION
SENSOR
AG
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-96
STEP3. Check the throttle position sensor.
(1) Disconnect the connector B-05.
(2) Measure the resistance between throttle position sensor
side connector terminal 1 and 4.
Standard value: 3.5
−−−−
6.5 k
Ω
Ω
Ω
Ω
(3) Measure resistance between the throttle position sensor
side connector terminal 1 and 3.
(4) Move the throttle valve from the idle position to the full-open
position.
•
Resistance should change smoothly in proportion to the
opening angle of the throttle valve.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the throttle position sensor.(Refer to
, Throttle Body.) Then go to Step 9.
STEP 4. Check the maladjusted throttle position sensor.
Refer to, Throttle Position Sensor Adjustment(
Q: Is the output voltage normal?
YES : Go to Step 5.
NO : Adjust it. Then go to Step 9.
STEP 5. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 9.
ACX02472
CONNECTOR : B-05
THROTTLE
POSITION
SENSOR
AG
AK000320
1 2 3 4
THROTTLE POSITION
SENSOR SIDE
CONNECTOR
AB
AK000280
CONNECTOR : C-41
PCM
AY
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