Mitsubishi 380. Manual — part 558

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-324

DTC P0223: Throttle Position Sensor (Sub) Circuit High Input.

.

CIRCUIT OPERATION

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

position sensor (sub) power terminal (terminal
No. 3) from the ENGINE-ECU(terminal No. 10).
The throttle position sensor (sub) outputs a volt-
age from (terminal No. 5) to the
ENGINE-ECU(terminal No. 57).
The ground terminal (terminal No. 2) is grounded
with ECU (terminal No. 27).

.

TECHNICAL DESCRIPTION

• The throttle position sensor (sub) outputs voltage

which corresponds to the throttle valve opening
angle.

• The ECU checks whether the voltage is within a

specified range.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch is "ON" position.

• TPS is normal.

Judgement Criteria

• MIL is actvated immediately.

• Vehicle in Limp home - Engine speed limited to

1500rpm.

.

EOBD DRIVE CYCLE PATTERN

None.

.

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

• Throttle position sensor failed.

• Short circuit to 5 Volts in throttle position sensor

(sub) circuit.

• Harness or connector damage

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB992044: Power Plant ECU Check Harness

03DB180A

CONNECTOR: B-06

B-06 (B)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-325

WARNING

If the air intake duct is removed from the throttle body take great care to keep fingers away
from the throttle plate. The drive motor has very high torque and is capable of random move-
ment at any time. Do not under any circumstances activate the throttly plate by hand.
When removing the throttle body from the intake manifold disconnect the wiring first. During
replacement connect the wiring last.
Do not activate the throttle body using a DC suppy to test the motor,as permanent damage to
the throttle body will result.

STEP 1. Using diagnostic tool , check data list item 15:
Throttle Position Sensor (sub).

CAUTION

To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool to the data reading mode for item 15,

Throttle Position Sensor (sub).

(4) Apply the accelerator pedal as required to check the

following:

• Output voltage should be between 1035 and 1250 mV

when the throttle valve is fully close.

• Output voltage should be approximately 4000 and 4824

mV when the throttle valve is fully open.

(5) 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 : Go to Step 2.

STEP 2. Check harness connector B-06 at throttle position
sensor for damage.
Q: Is the harness 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 8.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

03DB180A

CONNECTOR: B-06

B-06 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-326

STEP 3. Check the continuity at throttle position sensor
harness side connector B-06.
(1) Disconnect the connector B-06 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 4.

STEP 4. Check harness connector B-20 at ECU for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 8.

03DB180A

CONNECTOR: B-06

B-06 (B)

03DB195A

THROTTLE ACTUATOR

CONTROL MOTOR

CONNECTOR

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-327

STEP 5. Check for short circuit to 5-Volts and harness
damage between throttle position sensor connector B-06
(terminal No. 2) and ECU connector B-20 (terminal No. 27).
Q: Is the harness wire in good condition?

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

03DB180A

CONNECTOR: B-06

B-06 (B)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER