Mitsubishi Galant. Manual — part 219

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-101

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.

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

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 : Go to Step 2.

ACX02484 AH

THROTTLE
POSITION
SENSOR

CONNECTOR:B-05

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

AX

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-102

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.

STEP 3. Check the sensor supply voltage at throttle
position sensor harness side connector B-05.
(1) Disconnect the connector B-05 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 4 and ground.

•

Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the voltage normal?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Replace the PCM. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 11.

ACX02484 AH

THROTTLE
POSITION
SENSOR

CONNECTOR:B-05

AK000236

B-05 HARNESS
SIDE CONNECTOR

1

2

3

4

AE

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-103

STEP 5. Check the continuity at throttle position sensor
harness side connector B-05
(1) Disconnect the connector B-05 and measure at the harness

side.

(2) Measure the continuity between terminal 1 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 8.
NO : Repair it. Then go to Step 6.

STEP 6. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

).Then go to Step 11.

STEP 7. Check for open circuit and harness damage
between throttle position sensor connector B-05 terminal 1
and PCM connector C-40 terminal 57.
Q: Is the harness wire in good condition?

YES : Replace the PCM.Then go to Step 11.
NO : Repair it. Then go to Step 11.

AK000237

B-05 HARNESS
SIDE CONNECTOR

1

2

3

4

AD

AK000280

CONNECTOR : C-40

PCM

AV

ACX02484 AH

THROTTLE
POSITION
SENSOR

CONNECTOR:B-05

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-104

STEP 8. 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 9.
NO : Replace the throttle position sensor.(Refer to

P.13B-

530

, Throttle Body.) Then go to Step 11.

STEP 9. Check connector C-40, C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 11.

ACX02484 AH

THROTTLE
POSITION
SENSOR

CONNECTOR:B-05

AKX01413

THROTTLE POSITION
SENSOR CONNECTOR

1 2 3 4

AB

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

AX