Mitsubishi Pajero Pinin. Manual - part 114

MPI <4G9> – 

Troubleshooting

13C-42

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Intermittent malfunction 
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

OK

Check the harness wire between
the engine control relay and the idle
speed control servo, and between
the idle speed control servo and the
engine-ECU.

NG

Repair

OK

Check the following connector:
A-04

NG

Repair

From the previous page

MPI <4G9> – 

Troubleshooting

13C-43

Code No. P0551 Power Steering fluid Pressure Switch
System

Probable cause

Check Area

D

Intake air temperature is –10

_

C or higher.

D

Barometric pressure is 76 kPa or higher.

D

Engine coolant temperature is 30

_

C or more.

D

Repeat *1 drive and *2 stop ten times or more.

*1: Engine speed is 2,500 r/min or higher, volumetric efficiency is 55 % or

higher and vehicle speed is 5 km/h or higher for 4 seconds or more.

*2: Vehicle speed is 1.5 km/h or lower.
Judgment Criteria

D

Power steering pressure switch remains on.

D

Power steering fluid pressure switch failed.

D

Open or shorted power steering fluid pressure
switch circuit or loose connector

D

Malfunction of  engine-ECU

NG

Repair

Replace the engine-
ECU.

OK

NG

Check the harness wire
between engine-ECU
and power steering
pressure switch
connector.

OK

Check the trouble
symptom.

OK

Replace the engine-ECU.

OK

Check the trouble
symptom.

Repair

NG

OK

Check the following
connector:  A-76

NG

Repair

NG

Check the following
connectors:  A-76, C-88

OK

Measure at the power steering pressure switch connector
A-76.

D

Disconnect the connector and measure at the harness
side.

D

Voltage between 1 and ground (Ignition switch: ON)
OK: Battery positive voltage

OK

Check the following connector: A-76

NG

Repair

OK

Transient malfunction (Refer to GROUP 00 – Points to Note
for Intermittent Malfunctions.)

NG

Check the power steering pressure switch. 
(Refer to GROUP 37A – On-vehicle Service.)

NG

Replace

MUT-

II

 Data list

27 Power steering fluid pressure switch 
(Refer to P.13C-74, DATA LIST REFERENCE TABLE.)

MPI <4G9> – 

Troubleshooting

13C-44

Code No. P1603 Battery backup line system

Probable cause

Range of Check

D

Ignition switch: ON

Set Conditions

D

Backup RAM data which was set when the ignition switch was turned off
the previous time has not been retained.

D

Open circuit or short-circuit in the battery backup
line, or loose connector contact

D

Malfunction of the engine-ECU

OK

Check the harness between the
battery and the engine-ECU, and
repair if necessary.

NG

Repair

End

NO

MUT-

II

 diagnosis codes

D

Is code No. P1603 output?

NG

Replace the engine-ECU.

OK

Check the following connectors:
C-90

OK

Transient malfunction (Refer to
GROUP 00 – Points to Note for
Transient Malfunctions.)

OK

Check the trouble symptoms.

NG

Check the harness between the
battery and the engine-ECU, and
repair if necessary.

NG

Measure at the engine-ECU
connector C-90.

D

Measure the engine-ECU
terminal voltage.

D

Ignition switch: ON

D

Voltage between 80 and earth
OK: System voltage

NG

Replace

Were the battery terminals
disconnected immediately before
reading the diagnosis codes?

YES

Turn the ignition switch to the
LOCK (OFF) position, wait for 10
seconds, and then turn it back to
the ON position.

Measure at the ECU connector
C-90.

D

Disconnect the connector and
measure at the harness side.

D

Voltage between 80 and earth
OK: System voltage

OK

Check the following connector:
A-36, C-90

YES

MPI <4G9> – 

Troubleshooting

13C-45

Code No. P1610 Immobilizer system

Probable cause

Range of Check

D

Ignition switch: ON

Set Conditions

D

Improper communication between the engine-ECU and the immobilizer-ECU

D

Open or short circuit, or loose connector contact

D

Malfunction of the immobilizer-ECU

D

Malfunction of the engine-ECU

NOTE
(1) If the registered ignition keys are close each other when starting the engine, radio interference may

cause this code to be displayed.

(2) This code may be displayed when registering the key ID code.

NG

Replace the engine-ECU.

Check the trouble symptoms.

NG

Replace the immobilizer-ECU.

OK

Check the trouble symptoms.

OK

Check the harness wire between
the immobilizer-ECU and the
engine-ECU.

NG

Replace

Check the following connectors:
C-62, C-29, A-43X

NG

Repair