Mitsubishi Galant. Manual - part 104

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-97

STEP 6. Check for harness damage between throttle
position sensor connector B-05 terminal 4 and PCM
connector C-40 terminal 46.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO : Repair it. Then go to Step 9.

STEP 7. Check for harness damage between throttle
position sensor connector B-05 terminal 3 and PCM
connector C-41 terminal 78.
Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO : Repair it. Then go to Step 9.

ACX02472

CONNECTOR : B-05

THROTTLE
POSITION
SENSOR

AK000280

CONNECTOR : C-40

PCM

ACX02472

CONNECTOR : B-05

THROTTLE
POSITION
SENSOR

AK000280

CONNECTOR : C-41

PCM

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-98

STEP 8. 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(

P.00-8

NO : Replace the PCM. Then go to Step 9.

STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor(

P.13A-5

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0122 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-99

DTC P0123: Throttle Position Circuit High 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

88 89

76 77

72
79
91

73
80

81
92

8283
93

8485

8687

9596

GREEN-YELLO

WN-

WHITE

WN-

WHITE

BLA

POWERTRAIN CONTROL
MODULE(PCM)

C-40
(MU803781)

C-41
(MU803782)

AUTO-CRUISE
CONTROL SYSTEM

B-05
(MU802724)

THROTTLE POSITION
SENSOR

42 43
48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64 65 66

ACX02472

CONNECTOR : B-05

THROTTLE
POSITION
SENSOR

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-100

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 lower than 3,000 r/min.

•

Volumetric efficiency is lower than 30 percent.

Judgement Criteria

•

TPS output voltage has continued to be 4.6 volts
or higher 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

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(

P.00-8

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 (

P.00E-2

). Then go to Step 11.

AC003081 AB

16 PIN

MB991502

ACX02472

CONNECTOR : B-05

THROTTLE
POSITION
SENSOR

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