Mitsubishi 380. Manual - part 515

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-152

STEP 6. Check for harness damage between throttle 
position sensor connector B-06 (terminal No. 3) and 
ENGINE-ECU connector B-20 (terminal No. 10).
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair or replace it. Then go to Step 9.

03DB180A

CONNECTOR: B-06

B-06 (B)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-153

STEP 7. Check for open circuit, short circuit to ground and 
harness damage between throttle position sensor 
connector B-06 (terminal No. 6) and ENGINE-ECU 
connector B-20 (terminal No. 42).
Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Then go to Step 9.

STEP 8. Replace the throttle body assembly.
(1) Replace the throttle body assembly.
(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 : Then go to Step 9.
NO :  The inspection is complete.

03DB180A

CONNECTOR: B-06

B-06 (B)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB180A

CONNECTOR: B-06

B-06 (B)

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-154

STEP 9. Using diagnostic tool, read the diagnostic trouble 
code (DTC).

CAUTION

To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK"(OFF) position before connect-
ing or disconnecting diagnostic tool .
(1) Connect diagnostic tool  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.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-155

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.

.

CIRCUIT OPERATION

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

position sensor (main) power terminal (terminal 
No. 3) from the ENGINE-ECU (terminal No. 10).
The ground terminal (terminal No. 2) is grounded 
with ENGINE-ECU (terminal No. 27).

.

TECHNICAL DESCRIPTION

• The throttle position sensor (main) outputs volt-

age which corresponds to the throttle valve open-
ing angle.

• The ENGINE-ECU checks whether the voltage is 

within a specified range.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Throttle position sensor (main) output voltage is 

above range.

• MIL activated immediately

• Engine speed limited to 1500rpm.

.

EOBD DRIVE CYCLE PATTERN

None.

.

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

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

• Throttle position sensor failed.

• Open throttle position sensor (main) circuit, or 

harness damage or connector damage.

• Short circuit to 5 volt.

DIAGNOSIS

Required Special Tools:

•  Diagnostic tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991658: Test Harness

03DB180A

CONNECTOR: B-06

B-06 (B)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER