Mitsubishi Galant (2004+). Manual - part 1118

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-165

STEP 11. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P0122 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-166

DTC P0123: Throttle Position Sensor (main) Circuit High Input

CAUTION

If DTC P0123 has been set, TCL related DTC 
U1120 is also set. After P0123 has been diag-
nosed, don't forget to erase DTC U1120.

.

AK302837

YELLO

W

-RED

RED-WHITE

BLA

CK-WHITE

B-06

5 V

94

THROTTLE POSITION
SENSOR (MAIN)

POWERTRAIN CONTROL MODULE (PCM)

99

95

Throttle Position Sensor (Main) Circuit

B-22

6

1 2 3 4 5

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

5

4

3

HALL IC

AK303042

THROTTLE BODY ASSEMBLY
(INCORPORATING THROTTLE
POSITION SENSOR)

B-06 (B)

CONNECTOR: B-06

AB

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-167

CIRCUIT OPERATION

• A 5-volt power supply is applied on the throttle 

position sensor (main) power terminal (terminal 
No. 5) from the PCM (terminal No. 94).
The ground terminal (terminal No. 3) is grounded 
with PCM (terminal No. 95).

.

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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-168

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Throttle position sensor (main) output voltage 

should be 4.8 volts or more for 0.5 second.

.

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, or 

harness damage or connector damage.

• PCM failed.

START

YES

YES

YES

NO

NO

NO

CONTINUOUS

FAILURE FOR 0.5sec

MALFUNCTION

END

GOOD

OUTPUT VOLTAGE

< =0.35V

OUTPUT VOLTAGE > =4.8V

AK302389