Mitsubishi Pajero Pinin. Manual — part 85
GDI –
Troubleshooting
13A-89
INSPECTION PROCEDURE 26
Ignition switch-ST system <M/T>
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.
Malfunction of the ignition switch
Open circuit or short-circuited harness wire of the
ignition switch circuit
Malfunction of the engine-ECU
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54.)
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector:
C-18
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and the ignition switch.
(1) NG
Check the following connector:
C-27
NG
Repair
Check the harness wire between the
engine-ECU connector (terminal
No.91) and the earth, repair it neces-
sary.
(2) NG
Measure at the engine-ECU connector
C-18.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 68 and earth
(Ignition switch: START)
OK: 8 V or more
(2) Continuity between 67 and earth
OK: Continuity
INSPECTION PROCEDURE 27
Ignition switch-ST and inhibitor switch system <A/T>
Probable cause
The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking, and the engine-ECU uses this signal to carry out functions
such as fuel injection control during starting.
The inhibitor switch inputs the position of the selector lever to the engine-ECU.
The engine-ECU uses this signal to carry out idle speed control.
Malfunction of the ignition switch
Malfunction of the inhibitor switch
Open circuit or short-circuited harness wire
between ignition switch and inhibitor switch
Malfunction of the engine-ECU
GDI –
Troubleshooting
13A-90
NG
Repair
OK
Replace the engine-ECU
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and the inhibitor switch
connector.
(1) NG
Check the following connectors:
C-18, C-24 <LHD>, C-26 <RHD>,
D-02
NG
Repair
Check the harness wire between the
inhibitor switch connector and the start-
er S terminal, and repair if necessary.
(2) NG
Measure at the inhibitor switch connec-
tor B-04.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 4 and earth
(Ignition switch: ON)
OK: System voltage
(2) Continuity between 1 and earth
OK: Continuity
(3) Voltage between 4 and earth
(Ignition switch: START)
Disconnect the engine-ECU con-
nector.
OK: System voltage
OK
Check the inhibitor switch (Refer to
GROUP 23 – On-vehicle Service).
NG
Repair
OK
Check the following connectors:
A-83, B-01
NG
Check the trouble symptoms.
NG
Check the following connector:
B-04
Repair
NG
Repair
OK
Check the harness wire between the
engine-ECU and the inhibitor switch.
OK
Check the following connectors:
C-39, D-02
NG
Check the trouble symptoms.
Check the ignition switch (Refer to
GROUP 54.)
OK
Check the harness wire between the
inhibitor switch and the ignition switch
connector.
(3) NG
NG
Replace
NG
Repair
INSPECTION PROCEDURE 28
Accelerator pedal position switch system
Probable cause
The accelerator pedal position switch detects that the accelerator pedal is fully closed,
and sends a signal to the engine-ECU. The engine-ECU controls idle speed, based
on this signal.
Maladjustment of the accelerator cable
Maladjustment of the accelerator pedal position switch
Open circuit or short-circuited harness wire in the
accelerator pedal position switch system, or poor
connector contact
Malfunction of the engine-ECU
NG
Repair
NG
Replace the engine-ECU.
OK
NG
Repair
Check the accelerator pedal position switch. (Refer to P.13A-105*.)
NG
Replace the accelerator pedal position sensor assembly.
OK
Measure at accelerator pedal position sensor connector C-46.
Disconnect the connector, and measure at the harness side.
Voltage between terminal 4 and earth
(Ignition switch: ON)
OK: 4 V or more
Continuity between terminal 5 and earth
OK: Continuity
NG
Check the following connectors: A-36, C-19
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and accelerator
pedal position sensor.
OK
Check the following connector: C-46
NG
Repair
OK
Check trouble symptom.
NOTE
*:
Refer to the ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE99E1)
GDI –
Troubleshooting
13A-91
INSPECTION PROCEDURE 29
Fuel pump (low pressure) system
Probable cause
The engine-ECU turns on the fuel pump relay while the engine is cranking or running,
and supplies power source to the fuel pump (low pressure).
Malfunction of the fuel pump relay
Malfunction of the fuel pump (low pressure)
Open circuit or short-circuited harness wire in the
fuel pump (low pressure) circuit, or poor connector
contact
Malfunction of the engine-ECU
NG
Replace the fuel pump (low pressure).
OK
Check trouble symptom.
OK
Check the following connector:
D-17
NG
Repair
Check trouble symptom.
NG
Check the harness wire between the
fuel pump (low pressure) and earth,
and repair if necessary.
NG
Repair
OK
(2) NG
Check the following connector:
D-12
OK
Check trouble symptom.
NG
Check the harness wire between the
fuel pump relay and fuel pump (low
pressure), and repair if necessary.
(1) NG
Check the following connectors:
C-24 <LHD>, C-26 <RHD>, D-12
NG
Repair
NG
Measure at fuel pump (low pressure)
connector D-17.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between terminal 5 and
earth (Ignition switch: ON)
OK: System voltage
(2) Continuity between 4 and earth
OK: Continuity
OK
Check trouble symptom.
NG
Replace the engine-ECU.
OK
Check the following connector:
C-17
NG
Repair
OK
Measure at engine-ECU connector
C-17.
Disconnect the connector, and
measure at the harness side.
Short circuit between terminal 21
and earth (Ignition switch: ON)
OK: The fuel pump operates (its
operation sound can be
heard).
Check trouble symptom.
NG
Check the harness wire between the
fuel pump relay and engine-ECU, and
repair if necessary.
NG
Repair
OK
OK
Measure at engine-ECU connector
C-17.
Disconnect the connector, and
measure at the harness side.
Voltage between terminal 21 and
earth (Ignition switch: ON)
OK: System voltage
NG
Check the following connector:
A-41X
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54 – Ignition Switch.)
OK
Check trouble symptom.
NG
Check the harness wire between the
fuel pump relay and ignition switch.
NG
Check the following connectors:
C-72, C-74
NG
Repair
OK
Measure at fuel pump relay connector
A-41X.
Disconnect the connector, and
measure at the harness side.
Voltage between terminals 3, 4 and
earth (Ignition switch: ON)
OK: System voltage
NG
Check the fuel pump relay. (Refer to
P.13A-102*.)
NG
Replace
MUT-
II
Actuator test
07 Fuel pump (Refer to P.13A-100.)
OK
Normal
NOTE
*:
Refer to the ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1)
GDI –
Troubleshooting
13A-92
INSPECTION PROCEDURE 30
Power steering fluid pressure switch system
Probable cause
The power steering fluid pressure switch sends a signal to the engine-ECU according
to power steering load.
Based on this signal, the engine-ECU controls the throttle control servo so that
idle speed increases when the power steering is in operation.
Malfunction of the power steering fluid pressure switch
Open circuit or short-circuited harness wire in the
power steering fluid pressure switch circuit, or poor
connector contact
Malfunction of the engine-ECU
NG
Repair
OK
Replace the engine-ECU
NG
NG
Check the harness wire between the engine-ECU and power steer-
ing fluid pressure switch.
NG
Repair
OK
Check trouble symptom.
NG
Replace
OK
NG
Check the following connector: C-18
NG
Repair
OK
OK
Check the following connector: A-76
Check trouble symptom.
Check the power steering fluid pressure switch. (Refer to GROUP
37A – On-vehicle Service.)
Measure at power steering fluid pressure switch connector A-76.
Disconnect the connector, and measure at the harness side.
Voltage between terminal 1 and earth
(Ignition switch: ON)
OK: System voltage
INSPECTION PROCEDURE 31
A/C switch and A/C relay system
Probable cause
If the engine-ECU receives a ‘A/C on’ signal, it operates the throttle control servo
and A/C compressor magnetic clutch so that idle speed increases.
Malfunction of the A/C control system
Malfunction of the A/C switch
Open circuit or short-circuited harness wire in the
A/C switch circuit, or poor connector contact
Malfunction of the engine-ECU
NG
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Service the A/C compressor relay. (Refer to GROUP 55 – On-ve-
hicle Service.)
NG
Replace
OK
Measure at engine-ECU connectors C-17, C-19.
Disconnect the connector, and measure at the harness side.
Voltage between terminals 20, 83 and earth
(Ignition switch: ON)
OK: 0 – 3 V
(A/C switch: OFF)
System voltage
(A/C switch: ON)
Connect terminal 20 to earth.
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.
OK
Check the following connectors:
C-17, C-19
Check the A/C system. (Refer to GROUP 55 – On-vehicle Service.)
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