Mitsubishi 380. Manual - part 504

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-108

STEP 9. Measure the sensor output voltage at 
ENGINE-ECU connector B-20 by using  ECU check 
harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect  

ECU check harness special tool MB992044 between the 
separated connectors.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 41 of 

ENGINE-ECU check harness and ground.

• When altitude is 0 m, voltage should be 4.01 to 4.15 

volts.

• When altitude is 600 m, voltage should be 3.76 to 3.92 

volts.

• When altitude is 1,200 m, voltage should be 3.45 to 3.62 

volts.

• When altitude is 1,800 m, voltage should be 3.2 to 3.3 

volts.

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

Q: Is the measured voltage correct?

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 sensor. Then go to Step 12.

STEP 12. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− EOBD Drive Cycle − 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).

Q: Is DTC P0107 set?

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

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB224A

B-20 HARNESS 

CONNECTOR 

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-109

DTC P0108: Manifold Absolute Pressure Circuit High Input.

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the manifold abso-

lute pressure sensor power terminal (terminal No. 
3) from ENGINE-ECU (terminal No. 25). The 
ground terminal (terminal No. 2) is grounded with 
ENGINE-ECU (terminal No. 12).

• A voltage that is proportional to the intake mani-

fold pressure is sent to the ENGINE-ECU (termi-
nal No. 41) from the manifold absolute pressure 
sensor output terminal (terminal No. 1).

.

TECHNICAL DESCRIPTION

• The manifold absolute pressure sensor outputs a 

voltage which corresponds to the intake manifold 
pressure.

• The ENGINE-ECU checks whether this voltage is 

within a specified range.

.

DTC SET CONDITIONS

Check Conditions

• None

Judgement Criteria

• MAP sensor output voltage is above 4.88 V for 2 

seconds.

.

EOBD DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− EOBD Drive Cycle − 

P.13A-11

.

.

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

• Manifold absolute pressure sensor failed.

• Open manifold absolute pressure sensor circuit, 

or connector damage.

• ENGINE-ECU failed.

DIAGNOSIS

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

1

2

3

CONNECTOR: B-02

03DB223A

MANIFOLD

ABSOLUTE

PRESSURE

SENSOR

INTAKE

MANIFOLD

B-02 (B)

HARNESS 

CONNECTOR:

COMPONENT SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-110

STEP 1. Measure the sensor output voltage at 
ENGINE-ECU connector B-20 by using  ECU check 
harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect  

ECU check harness special tool MB992044 between the 
separated connectors.

(2) Turn the ignition switch to the "ON" position.

(3) Measure and record the voltage between terminal No. 41 of 

ENGINE-ECU check harness and ground.

• When altitude is 0 m, voltage should be 4.01 to 4.15 

volts.

• When altitude is 600 m, voltage should be 3.76 to 3.92 

volts.

• When altitude is 1,200 m, voltage should be 3.45 to 3.62 

volts.

• When altitude is 1,800 m, voltage should be 3.2 to 3.3 

volts.

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

Q: Is the measured voltage correct?

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.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB224A

B-20 HARNESS 

CONNECTOR 

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-111

STEP 2. Measure the ground voltage at manifold absolute 
pressure sensor connector B-02 by backprobing.
(1) Do not disconnect the connector B-02.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2 and ground by 

backprobing.

• Voltage should be 0.5 volt or less.

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

Q: Is the measured voltage 0.5 volt or less?

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

1

2

3

CONNECTOR: B-02

03DB223A

MANIFOLD

ABSOLUTE

PRESSURE

SENSOR

INTAKE

MANIFOLD

B-02 (B)

HARNESS 

CONNECTOR:

COMPONENT SIDE

3

2

1

AK303030

B-02 HARNESS 

CONNECTOR: 

HARNESS SIDE

AB