Mitsubishi Pajero Pinin. Manual - part 36

 

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Mitsubishi Pajero Pinin. Manual - part 36

 

 

GDI – 

Troubleshooting

13A-10

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.

NOTE
If the ECU is replaced, the immobilizer-ECU and ignition key
should replaced together with it. Each ECU has an individual
information for immobilizer-ECU, and the individual information
is registered in the immobilizer-ECU.

DIAGNOSIS FUNCTION

ENGINE WARNING LAMP (CHECK ENGINE LAMP)

If an abnormality occurs in any of the following items related
to the Gasoline Direct Injection (GDI) system, the engine
warning lamp will illuminate.
If the lamp remains illuminated or if the lamp illuminates while
the engine is running, check the diagnosis code output.

Engine warning lamp inspection items

Oxygen sensor

Air flow sensor

Intake air temperature sensor

Throttle position sensor (1st channel)

Throttle position sensor (2nd channel)

Engine coolant temperature sensor

Crank angle sensor

Camshaft position sensor

Barometric pressure sensor

Detonation sensor

Injector

Abnormal combustion

Immobilizer system

Abnormal fuel pressure

Brake vacuum sensor

Fuel system malfunction

Accelerator pedal position sensor (1st channel)

Accelerator pedal position sensor (2nd channel)

Electronic-controlled throttle valve system

Engine warning lamp
(check engine lamp)

GDI – 

Troubleshooting

13A-11

Throttle valve position feedback

Throttle valve control servo motor (1st motor)

Throttle valve control servo motor (2nd motor)

Communication line system with throttle valve controller

Engine-ECU

NOTE
When the electronic-controlled throttle valve system is stopped,
the engine warning lamp flashes.

METHOD OF READING AND ERASING DIAGNOSIS
CODES

Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.

INSPECTION USING MUT-

II

 DATA LIST AND

ACTUATOR TESTING

1.

Carry out inspection by means of the data list and the
actuator test function.
If there is an abnormality, check and repair the chassis
harnesses and components.

2.

After repairing, re-check using the MUT-

II

 and check that

the abnormal input and output have returned to normal
as a result of the repairs.

3.

Erase the diagnosis code memory.

4.

Remove the MUT-

II

.

5.

Start the engine again and carry out a road test to confirm
that the problem has disappeared.

GDI – 

Troubleshooting

13A-12

FAIL-SAFE FUNCTION REFERENCE TABLE

If the diagnosis system detects any sensor malfunction, the vehicle can be driven safely by using a default
control logic instead of the faulty sensors.

Defective part or 
function

What to do when a sensor is defective

Air flow sensor

(1) Disables lean-mixture combustion.
(2) Determines injector basic operating time and basic ignition timing according to map

value, which has been predetermined by throttle position sensor and crank angle
sensor signals.

Intake air temperature
sensor

Controls as the intake air temperature is 25

_

C.

Throttle position
sensor (1st channel)

(1) Disables lean-mixture combustion.
(2) Controls throttle valve opening angle by closed loop control by using the throttle position

sensor (2nd channel) signal.

(3) Disables the throttle valve opening angle control when the throttle position sensor

(2nd channel) signal is also defective.

Throttle position
sensor (2nd channel)

(1) Disables lean-mixture combustion.
(2) Controls throttle valve opening angle by closed loop control by using the throttle position

sensor (1st channel) signal.

(3) Disables the throttle valve opening angle control when the throttle position sensor

(1st channel) signal is also defective.

Engine coolant
temperature sensor

Controls as if the engine coolant temperature is 80

_

C. (Note that this control will continue

until the ignition switch is turned off even if the sensor signal return to normal.)

Camshaft position
sensor

Controls according to the conditions before a failure is detected.

Vehicle speed sensor

(1) Disables lean-mixture combustion. However, if a predetermined time elapses at an

engine speed of 1,500 r/min or more, the lean-mixture combustion will return to normal.

(2) Disables lean-mixture combustion during engine idling.

Barometric pressure
sensor

Controls as if the barometric pressure is 101 kPa.

Detonation sensor

Holds the ignition timing at that for standard petrol.

Injector

(1) Disables lean-mixture combustion.
(2) Shuts down exhaust gas recirculation.

Abnormal combustion

Disables lean-mixture combustion.

Communication line
with A/T-ECU

Disables ignition timing retard control (engine and transmission total control) during shift
change.

Alternator FR terminal

Disables inhibition control of the alternator output according to electrical load (treats the
alternator as if it is  conventional one).

Fuel pressure sensor

(1) Controls as if the fuel pressure is 5 MPa (if there is open or short circuit).
(2) Turns off the fuel pump relay (if the fuel pressure is excessively high).
(3) Shuts off the fuel injection (If an excessively low pressure is detected or the engine

speed exceeds 3,000 r/min).

GDI – 

Troubleshooting

13A-13

Defective part or 
function

What to do when a sensor is defective

Accelerator pedal
position sensor (1st
channel)

(1) Disables lean-mixture combustion.
(2) Controls the throttle valve position by using the  accelerator pedal position sensor

(2nd channel) signal.

(3) Disables the electronic-controlled throttle valve system if the accelerator pedal position

sensor (2nd channel) signal is also defective.

Accelerator pedal
position sensor (2nd
channel)

(1) Disables lean-mixture combustion.
(2) Controls the throttle valve position by using the  accelerator pedal position sensor

(1st channel) signal.

(3) Disables the electronic-controlled throttle valve system if the accelerator pedal position

sensor (1st channel) signal is also defective.

Electronic-controlled
throttle valve system

(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.

Throttle valve position
feedback

(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.
However, if the throttle valve opening is great, controls as follows:
(1) Carries out lean-mixture combustion continuously.
(2) Shuts off fuel supply for 2 cylinders continuously.
(3) Shuts off fuel supply when engine speed exceeds 3,000 r/min.

Throttle valve control
servo motor (1st
motor) malfunction

Disables lean-mixture combustion.

Throttle valve control
servo motor (2nd
motor) malfunction

(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.

Communication line
with the throttle valve
controller

(1) Error in communication from the throttle valve controller to engine-ECU

D

Disables lean-mixture combustion.

D

Shuts off fuel supply when engine speed exceeds 3,000 r/min.

(2) Error in communication from the engine-ECU to throttle valve controller

D

Disables lean-mixture combustion.

D

Shuts off fuel supply when engine speed exceeds 3,000 r/min.

D

The throttle valve controller controls the throttle valve opening angle by using
the accelerator pedal position sensor  (2nd channel) signal.

NOTE
When the electronic-controlled throttle valve system is stopped, the engine warning lamp flashes.

 

 

 

 

 

 

 

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