Mitsubishi Galant (2004+). Manual — part 1309

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-929

STEP 5. 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 P2135 set?

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

DTC P2138: Accelerator Pedal Position Sensor (main and sub) Circuit Range/Performance Problem

CAUTION

If DTC P2138 has been set, TCL related DTC
U1120 and U1400 are also set. After P2138 has
been diagnosed, don't forget to erase DTC U1120
and U1400.

.

ACCELERATOR PEDAL POSITION SENSOR
(MAIN AND SUB) RANGE/PERFORMANCE
CIRCUIT

• Refer to DTC P2122 − Accelerator Pedal Position

Sensor (Main) Circuit

P.13B-889

.

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (Sub) Circuit

P.13B-906

.

.

CIRCUIT OPERATION

• Refer to DTC P2122 − Accelerator Pedal Position

Sensor (Main) Circuit

P.13B-889

.

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (Sub) Circuit

P.13B-906

.

.

TECHNICAL DESCRIPTION

• PCM checks the accelerator pedal position sen-

sor output signal characteristics for abnormal
conditions.

.

DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if the relation between accelera-

tor pedal position sensor (main) and accelerator
pedal position sensor (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

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-930

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

Logic Flow Chart

.

Check Condition

• Ignition switch is "ON" position.

• Accelerator pedal position sensor (main) output

voltage is between 0.6 and 4.5 volts.

• Accelerator pedal position sensor (sub) output

voltage is between 0.6 and 4.5 volts.

• Change of accelerator pedal position sensor

(sub) output voltage per 25 milliseconds is lower
than 0.06 volt.

Judgement Criteria

• Voltage obtained with the formula given below is

0.25 volt or higher for 1 second: [accelerator
pedal position sensor (sub) output voltage +0.3
volt]

− accelerator pedal position sensor (main)

output voltage.

.

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 1sec

{APS (SUB) +0.3V} -

APS (MAIN)

> =0.25V

MONITORING

CONDITIONS

AK302415

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-931

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

Logic Flow Chart

.

Check Condition

• Ignition switch is "ON" position.

• Accelerator pedal position sensor (main) output

voltage is between 0.6 and 4.5 volts.

• Accelerator pedal position sensor (sub) output

voltage is between 0.6 and 4.5 volts.

• Change of accelerator pedal position sensor

(sub) output voltage per 25 milliseconds is lower
than 0.06 volt.

Judgement Criteria

• Voltage obtained with the formula given below is

0.25 volt or higher for 0.2 second: [accelerator
pedal position sensor (main) output voltage

−

[accelerator pedal position sensor (sub) output
voltage +0.3 volt].

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• Accelerator pedal position sensor failed.

• Harness damage in accelerator pedal position

sensor circuit or connector damage.

• PCM failed.

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 0.2secs

MONITORING

CONDITIONS

AK302416

APS (MAIN) -

{APS (SUB) +0.3V}

> =0.25V

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-932

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check harness connector C-24 at accelerator
pedal position sensor for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 16.

STEP 2. Check the continuity at accelerator pedal position
sensor harness side connector C-24.

(1) Disconnect the connector C-24 and measure at the harness

side.

(2) Measure the continuity between terminal No. 2 and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 6.
NO : Go to Step 3.

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

1

6 5 4 3 2

AK303204

C-24 HARNESS
CONNECTOR:
COMPONENT SIDE

AB