Mitsubishi Pajero Pinin. Manual — part 111
MPI <4G9> –
Troubleshooting
13C-30
Code No. P0201 No. 1 injector system
Code No. P0202 No. 2 injector system
Code No. P0203 No. 3 injector system
Code No. P0204 No. 4 injector system
Probable cause
Range of Check
D
Engine speed is approx. 50 – 1,000 r/min
D
The throttle position sensor output voltage is 1.15 V or less.
D
Actuator test by MUT-
II
is not carried out.
Set Conditions
D
Surge voltage of injector coil is not detected for 4 seconds.
D
Malfunction of the injector
D
Improper connector contact, open circuit or short-cir-
cuited harness wire of the injector circuit
D
Malfunction of engine-ECU
NG
Replace the engine-ECU.
NG
Use an analyzer to measure the signal waveform at injector
connector A-61, A-62, A-63, A-64.
D
Use a test harness (MB991348) to connect the connector, and
measure at the pick-up harness side.
D
Engine: Idling
D
The voltage between terminal 2 and earth
OK: A normal waveform should be displayed as de-
scribed on P.13C-87 (INSPECTION PROCEDURE
USING AN ANALYZER).
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.
OK
Measure at the engine-ECU connector C-87.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 1, 2, 14, 15 and earth (Ignition switch: ON)
OK: System voltage
NG
Check the harness wire between the engine-ECU and the injector
connector, and repair if necessary.
OK
Check the following connector: C-87
NG
Repair
OK
Measure at the injector connector A-61, A-62, A-63, A-64.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
NG
Check the harness wire between the engine control relay and the
injector connector, and repair if necessary.
OK
Check the injector. (Refer to P.13C-106.)
NG
Replace
NG
Check the following connectors:
A-61, A-62, A-63, A-64
NG
Repair
MUT-
II
Actuator Test
01 No. 1 injector
02 No. 2 injector
03 No. 3 injector
04 No. 4 injector
OK: The idling condition should change
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to Note for Intermittent Malfunctions.)
MPI <4G9> –
Troubleshooting
MPI <4G9> –
Troubleshooting
13C-31
Code No. P0300 Ignition coil (power transistor) system
Probable cause
Range of Check
D
Engine speed is approx. 50 – 4,000 r/min.
D
Engine is not cranking.
Set Conditions
D
The ignition failure sensor does not send a signal about a certain cylinder
for 4 seconds.
D
Malfunction of the ignition coil
D
Malfunction of the ignition failure sensor
D
Malfunction of spark plug
D
Open or short circuit in the primary ignition
circuit or loose connector contact
D
Malfunction of engine-ECU
OK
Check the following connector:
C-87
NG
Repair
OK
Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 – Ignition
System.)
NG
Replace
OK
Use an analyzer to measure the signal waveform at engine-ECU connector C-87
connector.
D
Engine: Idling
D
The voltage between the ignition coil primary signal terminal for a defective
cylinder and earth
OK: A normal waveform should be displayed as described on P.13C-87 (Inspec-
tion Procedure Using an Analyzer).
OK
Repair the ignition coil assembly for
a defective cylinder and the spark
plug.
NG
Replace the engine-ECU.
NG
Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 – Ignition
System.)
Check the trouble symptoms.
NG
Replace the engine-ECU.
MUT-
II
Actuator Test
01 No. 1 injector
02 No. 2 injector
03 No. 3 injector
04 No. 4 injector
OK: The idling condition should
change.
Reference
When the cylinder (defective
cylinder) where idling condition does
not change is detected after
suspending the injector, go to (1)
and inspect the spark plug, the
ignition coil, the connector, and the
harness of the defective cylinder.
(When more than one cylinder are
detected, inspect all of them.)
When all the cylinders are OK, go
to (2).
(1)
Check the following connectors:
The ignition coil connectors, which
correspond to defective cylinders
(A-13, A-14).
NG
Repair
(2)
Use an analyzer to measure the
signal waveform at the ignition
failure sensor connector A-90.
D
Use test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.
D
Engine: Idling
D
The voltage between terminal 2
and earth
OK: A normal waveform should
be displayed as described
on P.13C-87 (INSPECTION
PROCEDURE USING AN
ANALYZER).
Reference
When a normal waveform is
displayed, compare it with that of
the ignition coil primary signal at the
engine-ECU terminal to determine
the cylinder (defective cylinder) with
an abnormal waveform.
→
When one or more cylinders are
abnormal, go to (1)
→
When all of the cylinders are
abnormal, go to (3)
→
When a normal waveform is
displayed, go to (4).
(3)
Check the following connector:
C-89
NG
Repair
OK
Check the harness wires between
the ignition failure sensor and the
engine-ECU, and between the
ignition failure sensor and earth.
NG
Repair
OK
Repair the ignition failure sensor.
(4)
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
(1)
MPI <4G9> –
Troubleshooting
13C-32
Code No. P0301 No. 1 cylinder misfire detected
Code No. P0302 No. 2 cylinder misfire detected
Code No. P0303 No. 3 cylinder misfire detected
Code No. P0304 No. 4 cylinder misfire detected
Probable cause
Range of Check
D
The engine speed is 500 – 4,500 r/min.
D
While the engine is running except deceleration and sudden acceleration.
Set Conditions
D
The number of misfires exceeds a predetermined number per 200 engine
revolutions (Misfire has occurred in only one cylinder).
or
D
The number of misfires exceeds a predetermined number per 100 engine
revolutions (Misfire has occurred in only one cylinder).
D
Malfunction of the ignition system
D
Abnormal compression
D
Malfunction of injector
D
Malfunction of engine-ECU
NG
Check the harness wire between the
ignition coil and the engine-ECU.
NG
Replace
NG
Repair
(2) NG
OK
Check the ignition failure sensor
(Refer to GROUP 16 – Ignition
System.)
OK
Check the harness wire between
the ignition coil and the earth, and
repair if necessary.
(3) NG
OK
Measure at ignition coil connectors
A-13, A-14.
D
Disconnect the connector and
measure at the harness side.
(1) The voltage between terminal 1
and earth
(Ignition switch: ON)
OK: System voltage
(2) The voltage between terminal 3
and earth
(Engine: Cranking)
OK: 0.5 – 4.0 V
(3) The resistance between terminal
2 and earth
OK: 2
Ω
or less
(1) NG
Check the following connectors:
A-13, A-14, A-90
NG
Repair
Check the ignition coil (Refer to
GROUP 16 – Ignition System.)
Check the compression pressure.
(Refer to GROUP 11B – On-vehicle
Service.)
Repair
Replace the engine-ECU.
OK
Check the harness wire between the
ignition coil and the ignition failure
sensor, and between the ignition
switch and the ignition failure sensor.
NG
Repair
OK
NG
NG
Repair
OK
Replace
NG
Check the spark plugs.
Check the trouble symptoms.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
Check the following connectors:
A-13, A-14
Check the following connectors:
A-13, A-14, C-87
OK
MPI <4G9> –
Troubleshooting
MPI <4G9> –
Troubleshooting
13C-33
Code No. P0325 Detonation sensor system
Probable cause
Range of Check
D
Engine: Two seconds after the engine has been started
Set Conditions
D
Changes in sensor output voltage (detonation sensor peak voltage per 1/2
crankshaft rotation) in 200 consecutive cycles are 0.06 V or less.
D
Malfunction of the detonation sensor
D
Open or short circuit in the detonation sensor
circuit or loose connector contact
D
Malfunction of engine-ECU
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions.)
Check the following connector: A-81
NG
Repair
OK
Measure at the detonation sensor connector A-81.
D
Disconnect the connector and measure at the harness
side.
D
The resistance between terminal 2 and earth
OK: 2
Ω
or less
NG
Check the harness wire between the detonation sensor and
earth, and repair if necessary.
OK
Check the following connector: C-90
NG
Repair
OK
Check the harness wire between the detonation sensor and
the engine-ECU.
NG
Repair
NG
Replace the detonation sensor.
Check the trouble symptoms.
NG
Replace the engine-ECU.
Code No. P0335 Crank angle sensor system
Probable cause
Range of Check
D
Engine is cranking
Set Conditions
D
Sensor output voltage does not change for 4 seconds (no pulse signal
input).
D
Malfunction of the crank angle sensor.
D
Open or short circuit in the crank angle sensor
circuit or loose connector contact.
D
Malfunction of engine-ECU
NG
Check the following connector:
A-77
NG
Repair
MUT-
II
Data list
22 Crank angle sensor
OK: Refer to P.13C-74, DATA
LIST REFERENCE TABLE.
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
OK
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