Mitsubishi Pajero Pinin. Manual — part 121
MPI <4G9> –
Troubleshooting
13C-70
OK
Check the trouble symptom.
NG
Replace the fuel pump.
OK
Check the following connector:
D-17
NG
Repair
NG
Check the harness wire between the
fuel pump and earth, and repair if neces-
sary.
Check the trouble symptom.
NG
Repair
OK
(2) NG
Check the following connector:
D-12
NG
Check the harness wire between the
fuel pump relay and fuel pump, and
repair if necessary.
OK
Check the trouble symptom.
(1) NG
Check the following connectors:
D-17, C-24<LHD>, C-26<RHD>, A-41X
NG
Repair
NG
Measure at fuel pump connector D-17.
D
Disconnect the connector, and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK: System voltage
(2) Continuity between 2 and earth
OK: Continuity
NG
Replace the engine-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
C-87
NG
Repair
OK
Measure at the engine-ECU
connector C-87.
D
Disconnect the connector, and
measure at the harness side.
D
Short circuit between terminal 22
and earth (Ignition switch: ON)
OK: The fuel pump operates (its
operation sound can be
heard).
NG
Check the harness wire between the
fuel pump relay and engine-ECU, and
repair if necessary.
Check the trouble symptom.
NG
Repair
OK
NG
Check the following connector:
C-87, A-41X
OK
Measure at the engine-ECU
connector C-87.
D
Disconnect the connector, and
measure at the harness side.
D
Voltage between terminal 22 and
earth (Ignition switch: ON)
OK: System voltage
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54 – Ignition Switch and Immo-
bilizer System.)
NG
Check the harness wire between the
fuel pump relay and ignition switch.
OK
Check the trouble symptom.
NG
Check the following connectors:
C-72, C-74
NG
Repair
OK
Measure at fuel pump relay connector
A-41X.
D
Disconnect the connector, and
measure at the harness side.
D
Voltage between terminals 3, 4 and
earth
(Ignition switch: ON)
OK: System voltage
From the previous page
MPI <4G9> –
Troubleshooting
13C-71
INSPECTION PROCEDURE 28
Ignition switch-ST system
Probable cause
The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking.
The engine-ECU uses this signal to carry out functions such as fuel injection
control during starting.
D
Malfunction of the ignition switch
D
Malfunction of the inhibitor switch <A/T>
D
Open circuit or short-circuited harness wire of the
ignition switch circuit
D
Malfunction of the engine-ECU
<M/T>
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector:
C-90
NG
Repair
NG
Repair
OK
Check the ignition switch.
(Refer to GROUP 54.)
NG
Check the harness wire between the
engine-ECU and the ignition switch.
OK
Check the trouble symptoms.
NG
Check the following connectors:
C-90, A-86, C-27, C-61
NG
Repair
Measure at the engine-ECU connector
C-90.
D
Disconnect the connector, and
measure at the harness side.
D
Voltage between 71 and earth
(Ignition switch: START)
OK: 8 V or more
<A/T>
Measure at the inhibitor switch connector B-04.
D
Disconnect the connector, and measure at the harness
side.
D
Voltage between 10 and earth (Ignition switch: START)
OK: System voltage
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
NG
Repair
OK
Check the following connector: C-90
NG
Check the harness wire between inhibitor switch and engine-ECU,
and repair if necessary.
NG
Repair
OK
Check the trouble symptoms.
NG
Check the following connectors: A-86, B-01, B-04 C-90
OK
Measure at the engine-ECU connector C-90.
D
Disconnect the connector, and measure at the harness
side.
D
Voltage between 71 and earth
(Selector lever position: P or N)
(Ignition switch: START)
OK: System voltage
NG
Repair
OK
Check the ignition switch (Refer to GROUP 54 – Ignition Switch.)
NG
Check the harness wire between inhibitor switch and ignition switch.
NG
Repair
OK
Check the trouble symptoms.
NG
Check the following connector: B-04, C-02, C-39, C-61
OK
Check the inhibitor switch
D
Continuity between 9 and 10
(Refer to GROUP 23 – On-vehicle service.)
NG
Replace
MPI <4G9> –
Troubleshooting
13C-72
INSPECTION PROCEDURE 29
A/C switch and A/C relay system
Probable cause
When an A/C ON signal is input to the engine-ECU, the engine-ECU carries out
control of the idle speed control (ISC) servo, and also operates the A/C compressor
magnetic clutch.
D
Malfunction of A/C control system
D
Malfunction of A/C switch
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction of the engine-ECU
Check the A/C compressor relay.
(Refer to GROUP 55 – On-vehicle Service.)
NG
Replace
OK
Measure at the engine-ECU connector C-87.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 8 and earth
(Ignition switch: ON)
OK: 0 – 3 V (A/C switch: OFF)
System voltage (A/C switch: ON)
D
Short circuit between 8 and earth
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.
NG
Check the A/C system. (Refer to GROUP 55 – Troubleshooting.)
OK
Check the following
connector: C-87
NG
Replace
OK
Check the trouble symptom.
NG
Replace the engine-ECU.
INSPECTION PROCEDURE 30
Ignition circuit system
Probable cause
The engine-ECU interrupts the ignition coil primary current by turning the
power transistor inside the engine-ECU ON and OFF.
D
Malfunction of ignition coil.
D
Malfunction of ignition failure sensor.
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction of the engine-ECU
OK
To the next page
OK
Check the ignition switch. (Refer to GROUP 54 – Ignition Switch.)
NG
Check the harness wire
between the ignition fail-
ure sensor and ignition
switch connector.
NG
Repair
OK
Check the trouble symptom.
NG
Check the following
connectors: C-72, C-74
NG
Repair
Measure at the ignition failure sensor connector A-90.
D
Disconnect the connector and measure at the harness side.
Voltage between 4 and ground (Ignition switch: ON)
OK: System voltage
OK
OK
Check the ignition failure sensor.
(Refer to GROUP 16 – Ignition
System.)
NG
Replace
Check the ignition coil. (Refer to
GROUP 16 – Ignition System.)
NG
Replace
MPI <4G9> –
Troubleshooting
13C-73
OK
Replace the ignition failure sensor.
NG
Check the harness wire
between the engine-ECU
and the ignition failure
sensor connector.
NG
Repair
Replace the engine-ECU.
OK
OK
Check the trouble symptom.
NG
Check the following
connectors: C-89,
A-90
NG
Repair
Measure at the engine-ECU connector C-89.
D
Measure with the connector connected.
D
Voltage between 58 and earth
(Engine: Cranking or 3,000 r/min)
OK: 0.3 – 3.0 V
OK
Check the harness wire between the ignition failure sensor and
earth, and repair if necessary.
(2) NG
There is an open or short-circuit the ignition signal output harness
of the ignition failure sensor, so check and repair the harness.
(1) NG
Measure at the ignition failure sensor connector A-90.
D
Disconnect the connector and measure at the harness side.
(1) Voltage between 2 and earth (Ignition switch: ON)
OK: 4 V or more
(2) Continuity between 1 and earth
OK: Continuity
NG
OK
Check the trouble symptom.
OK
Check the following connectors:
A-13, A-14
NG
Repair
(3) NG
Check the harness wire between
the ignition coil connector and
ground, and repair if necessary.
OK
Replace the engine-ECU.
NG
Check the harness wire between
the engine-ECU and ignition coil
connector.
NG
Repair
OK
Check the trouble symptom.
(2) NG
Check the following connector:
C-87, A-90
NG
Repair
NG
Check the harness wire between the
ignition coil and ignition failure sensor
connector, and repair if necessary.
OK
Check the trouble symptom.
(1) NG
Check the following connector:
A-13, A-14, A-90
NG
Repair
OK
Measure at the ignition coil connectors
A-13, A-14.
D
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 1 and earth
(Ignition switch: ON)
OK: Battery positive voltage
(2) Voltage between 3 and earth
(Engine: Cranking)
OK: 0.5 – 4.0 V
(3) Continuity between 2 and earth
OK: Continuity
From the previous page
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