Mitsubishi Galant 9G. Manual - part 871

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-926

STEP 7. Using scan tool MB991958, check data list item 77: 
Accelerator Pedal Position Sensor (sub).

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 

77, Accelerator Pedal Position Sensor (sub).

• Output voltage is between 0.435 and 1.035 volts when 

foot is released from accelerator pedal.

• Output voltage is 3.7 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 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Replace the PCM. Then go to Step 8.

STEP 8. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(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 P2128 set?

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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-927

DTC P2135: Throttle Position Sensor (main and sub) Range/Performance Problem

CAUTION

If DTC P2135 has been set, TCL related DTC 
U1120 is also set. After P2135 has been diag-
nosed, don't forget to erase DTC U1120.

.

THROTTLE POSITION SENSOR (MAIN 
AND SUB) RANGE/PERFORMANCE 
PROBLEM CIRCUIT

• Refer to DTC P0122 − Throttle Position Sensor 

(main) Circuit 

P.13A-159

.

• Refer to DTC P0222 − Throttle Position Sensor 

(sub) Circuit 

P.13A-504

.

.

CIRCUIT OPERATION

• Refer to DTC P0122 − Throttle Position Sensor 

(main) Circuit 

P.13A-159

.

• Refer to DTC P0222 − Throttle Position Sensor 

(sub) Circuit 

P.13A-504

.

.

TECHNICAL DESCRIPTION

• PCM checks the throttle position sensor output 

signal characteristics for abnormal conditions.

.

DESCRIPTIONS OF MONITOR METHODS

Detect malfunction if the relation between throttle 

position sensor (main) and throttle position sen-
sor (sub) is wrong.

.

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

• Mass airflow sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-928

DTC SET CONDITIONS <Range/Performance problem-relation between main and 
sub>

Logic Flow Chart

Check Conditions

• Ignition switch is "ON" position.

• Throttle position sensor (main) output voltage is 

between 0.35 and 2.5 volts.

• Throttle position sensor (sub) output voltage is 

between 2.25 and 4.8 volts.

Judgement Criteria

• Voltage obtained with the formula given below is 

0.3 volt or higher for 0.5 second: throttle position 
sensor (main) output voltage 

− [throttle position 

sensor (sub) output voltage 

− 2 volts]

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 0.5sec

|

TPS (MAIN) - (TPS (SUB)-2.0V)

|

> =0.3V

MONITORING

CONDITIONS

AK302047

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-929

Logic Flow Chart

Check Conditions

• Ignition switch is "ON" position.

• Throttle position sensor (main) output voltage is 

between 2.5 and 4.8 volts.

• Throttle position sensor (sub) output voltage is 

higher than 2.25 volts.

Judgement Criteria

• Throttle position sensor (sub) output voltage is 

4.2 volts or lower.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-6

.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are:)

• Throttle position sensor failed.

• Shorted throttle position sensor circuit or connec-

tor damage.

• PCM failed.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 0.5sec

TPS (SUB) < =4.2V

MONITORING

CONDITIONS

AK302048