Mitsubishi 380. Manual - part 572

 

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Mitsubishi 380. Manual - part 572

 

 

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-380

STEP 14. Check for open circuit and harness damage 
between camshaft position sensor connector B-106 
(terminal No. 1) and ECU connector B-20 (terminal No. 25).
Q: Is the harness wire in good condition?

YES : Then go to Step 15.
NO :  Repair it. Then go to Step 20.

STEP 15. Check ECU harness connector B-20 for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 16.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 20.

1

2

3

AK303130

HARNESS 

CONNECTOR: 

COMPONENT SIDE

AB

CAMSHAFT POSITION 

SENSOR

B-106 (B)

CONNECTOR: B-106

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-381

STEP 17. Check for harness damage between connector 
B-20 (terminal No. 25) and camshaft position sensor 
connector B-106 (terminal No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 18.
NO :  Repair it. Then go to Step 20.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

1

2

3

AK303130

HARNESS 

CONNECTOR: 

COMPONENT SIDE

AB

CAMSHAFT POSITION 

SENSOR

B-106 (B)

CONNECTOR: B-106

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-382

STEP 18. Check for harness damage between camshaft 
position sensor connector B-106 (terminal No. 2) and ECU 
connector B-20 (terminal No. 38).
Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO :  Repair it. Then go to Step 20.

STEP 19. Check the camshaft position sensing cylinder.

Q: Is the camshaft position sensing cylinder in good 

condition?
YES : 
Replace the camshaft position sensor. Then go to 

Step 20.

NO :  Repair or replace it. Then go to Step 20.

STEP 20. 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 P0340 set?

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

1

2

3

AK303130

HARNESS 

CONNECTOR: 

COMPONENT SIDE

AB

CAMSHAFT POSITION 

SENSOR

B-106 (B)

CONNECTOR: B-106

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-383

DTC P0421: Warm Up Catalyst Efficiency Below Threshold (bank 1)

.

TECHNICAL DESCRIPTION

• The signal from the rear heated oxygen sensor 

differs from the front heated oxygen sensor. That 
is because the catalytic converter purifies 
exhaust gas. When the catalytic converter has 
deteriorated, the signal from the front heated oxy-
gen sensor becomes similar to the rear heated 
oxygen sensor.

• The ECU compares the output of the front and 

rear heated oxygen sensor signals.

.

DTC SET CONDITIONS

Check Conditions

• Lambda control upstream catalyst is active.

• Downstream oxygen sensor ready for operation.

• Lambda controller does not reach MIN/MAX limit.

• P-part of lambda control downstream is active.

• Neutralization of catalyst oxygen stroge is not 

active.

• No misfire.

• Transient control is not active.

• Active charcoal is not highly charged.

• No rapid load changes.

• Catalyst load within range.

• Load is between 14 and 30% <M/T> or 16 and 

38% <A/T>.

• Engine speed is between 1080 and 2480 r/min 

<M/T> or 1120 and 2480 r/min <A/T>.

• Catalyst temperature is between 580 and 780 

degreeC <M/T> or 535 and 730 degreeC <A/T>.

Judgment Criteria

• calculated aeging value (based on the sensor 

signal ratio) exceeds 0.55.

• MIL activated after 2 drive cycles.

• No Limp home.

.

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: )

• Right bank side catalytic converter deteriorated.

• Exhaust leak.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

 

 

 

 

 

 

 

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