Mitsubishi Pajero Pinin. Manual — part 115
MPI <4G9> –
Troubleshooting
13C-46
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure
No.
Reference page
Communication
with MUT-
II
is
Communication with all systems is not possible.
1
13C-47
with MUT-
II
is
impossible.
Communication with engine-ECU only is not possible.
2
13C-47
Engine warning
lamp and
related parts
The engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.
3
13C48
related parts
The engine warning lamp remains illuminating and never goes
out.
4
13C-48
Starting
No initial combustion (starting impossible)
5
13C-49
Initial combustion but no complete combustion
(starting impossible)
6
13C-50
Long time to start (improper starting)
7
13C-51
Idling stability
(Improper idling)
Unstable idling (Rough idling, hunting)
8
13C-52
(Improper idling)
Idling speed is high. (Improper idling speed)
9
13C-54
Idling speed is low. (Improper idling speed)
10
13C-54
Idling stability
(Engine stalls)
When the engine is cold, it stalls at idling. (Die out)
11
13C-55
(Engine stalls)
When the engine becomes hot, it stalls at idling. (Die out)
12
13C-56
The engine stalls when starting the car. (Pass out)
13
13C-58
The engine stalls when decelerating.
14
13C-58
Driving
Hesitation, sag or stumble
15
13C-59
The feeling of impact or vibration when accelerating
16
13C-60
The feeling of impact or vibration when decelerating
17
13C-60
Poor acceleration
18
13C-61
Surge
19
13C-63
Knocking
20
13C-64
Dieseling
21
13C-64
Too high CO and HC concentration when idling
22
13C-65
Idling speed is improper when A/C is operating
23
13C-66
Fans (radiator fan, A/C condensor fan) are inoperative
24
13C-67
MPI <4G9> –
Troubleshooting
13C-47
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with MUT-
II
is not possible.
(Communication with all systems is not possible.)
Probable cause
The cause is probably a defect in the power supply system (including earth) for
the diagnosis line.
D
Malfunction of the connector
D
Malfunction of the harness wire
OK
Replace the MUT-
II
.
OK
Check the trouble symptom.
NG
Check the harness wire between the
power supply and diagnostic connector
(16-pin), and repair if necessary.
NG
Repair
NG
Check the following connectors:
C-76, C-77
Measure at the diagnostic connector
(16-pin) C-35.
D
Voltage between 16 and earth
OK: Battery voltage
OK
Measure at the diagnostic connector
(16-pin) C-35.
D
Continuity between 4 and earth
D
Continuity between 5 and earth
OK: Continuity
NG
Check the harness wire between the
diagnostic connector (16-pin) and
earth, and repair if necessary.
Check the following connectors: C-01
OK
NG
Repair
INSPECTION PROCEDURE 2
MUT-
II
communication with engine-ECU is impossible.
Probable cause
One of the following causes may be suspected.
D
No power supply to engine-ECU.
D
Defective earth circuit of engine-ECU.
D
Defective engine-ECU.
D
Improper communication line between engine-ECU and MUT-
II
D
Malfunction of engine-ECU power supply circuit
D
Malfunction of engine-ECU
D
Open circuit between the engine-ECU and diagnosis
connector
OK
Check the engine-ECU power supply and earth circuit system.
(Refer to P.13C-68, INSPECTION PROCEDURE 25.)
NG
Check the harness wire between engine-ECU and diagnosis con-
nector.
NG
Repair
OK
Check the trouble symptom.
Check the following connectors:
C-35, B-70, C-53, C-28, C-89
NG
Repair
MPI <4G9> –
Troubleshooting
13C-48
INSPECTION PROCEDURE 3
The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.
Probable cause
Because there is a burnt-out bulb, the engine-ECU causes the engine warning lamp
to illuminate for five seconds immediately after the ignition switch is turned to ON.
If the engine warning lamp does not illuminate immediately after the ignition switch
is turned to ON, one of the malfunctions listed at right has probably occurred.
D
Burnt-out bulb
D
Defective warning lamp circuit
D
Malfunction of the engine-ECU
OK
Check the trouble symptom.
NG
Check the harness wire between combination meter and engine-
ECU, and repair if necessary.
OK
Check the following connectors:
C-07, C-28, C-88
NG
Repair
NG
Check the engine warning lamp power supply circuit, and repair
if necessary.
OK
Measure at the combination meter connector C-07.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 46 and earth (Ignition switch: ON)
OK: System voltage
NG
Check a burnt-out bulb.
NG
Replace
NG
Replace the engine-ECU.
OK
Check the trouble symptom.
OK
Check the following
connector: C-88
NG
Repair
OK
Measure at the engine-ECU connector C-88.
D
Disconnect the connector, and measure at the harness side.
D
Earth the terminal No. 36.
OK: The engine warning lamp illuminates.
MUT-
II
Data list
16 engine-ECU power supply voltage (Refer to P.13C-75.)
NG
Check the engine-ECU power supply and earth circuit.
(Refer to P.13C-68, INSPECTION PROCEDURE 25.)
INSPECTION PROCEDURE 4
The engine warning lamp remains illuminating and never
goes out.
Probable cause
In cases such as the above, the cause is probably that the engine-ECU is detecting
a problem in a sensor or actuator, or that one of the malfunctions listed at right
has occurred.
D
Short-circuit between the engine warning lamp and
engine-ECU
D
Malfunction of the engine-ECU
OK
Replace the engine-ECU.
No
Measure at the combination meter connector C-07.
D
Disconnect the connector, and measure at the harness side.
D
Disconnect the engine-ECU connector
D
Continuity between 46 and earth
OK: No continuity
NG
Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13C-12, INSPECTION CHART FOR DIAGNOSIS
CODES.
MPI <4G9> –
Troubleshooting
13C-49
INSPECTION PROCEDURE 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.
D
Malfunction of the ignition system
D
Malfunction of the fuel pump system
D
Malfunction of the injectors
D
Malfunction of the engine-ECU
D
Malfunction of the immobilizer system
D
Foreign materials in fuel
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check if the injectors are clogged.
D
Check if foreign materials (water, alcohol, etc.) got into fuel.
D
Check the compression pressure.
D
Check the immobilizer system.
Yes
Measure at the ignition coil connectors A-13 and A-14
D
Connectors connected
D
Check by connecting the timing light to terminal 1 of each
connector (Engine: Cranking)
OK: The timing light flashes.
No
Check the ignition circuit system. (Refer to P.13C-72, INSPECTION
PROCEDURE 30.)
OK
Can any sound be heard from the injectors when cranking?
No
Check the injector system. (Refer to P.13C-30, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13C-75.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13C-20, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
MUT-
II
Actuator test
07 Fuel pump (Refer to P.13C-79.)
NG
Check the fuel pump system.
(Refer to P.13C-69, INSPECTION PROCEDURE 27.)
No
MUT-
II
Data list
22 Crank angle sensor
OK: Cranking speed is displayed
No
Check the crank angle sensor system. (Refer to P.13A-113, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0335.)
Yes
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13C-12, INSPECTION CHART FOR DIAGNOSIS
CODES.
OK
Does the camshaft rotate at the engine cranking?
(When oil filler cap is removed.)
No
Check timing belt for breakage.
No
MUT-
II
Data list
16 Power supply voltage (Refer to P.13C-75.)
NG
Check the power supply and ignition switch-IG system.
(Refer to P.13C-69, INSPECTION PROCEDURE 26.)
OK
Is immobilizer-ECU diagnosis code displayed?
Yes
Check the immobilizer.
(Refer to GROUP 54 – Ignition Key and Immobilizer.)
Check battery voltage when cranking.
OK: 8 V or higher
NG
Check the battery. (Refer to GROUP 54 – Battery.)
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