Mitsubishi Space Star. Manual — part 57
MPI –
Troubleshooting
13B-15
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness wire between
the engine coolant temperature
sensor and the engine-ECU, and
repair if necessary.
OK
Check the following connectors:
B-31
NG
Repair
OK
Measure at engine coolant
temperature sensor connector A-76.
Use test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
Ignition switch: ON
Voltage between terminal 1 and
earth
OK: At 0
C of engine coolant
temperature: 3.2 – 3.8 V
At 20
C of engine coolant
temperature: 2.3 – 2.9 V
At 40
C of engine coolant
temperature: 1.3 – 1.9 V
At 80
C of engine coolant
temperature: 0.3 – 0.9 V
NG
Check the engine coolant
temperature sensor.
(Refer to P.13B-71*.)
NG
Repair
From the previous page
NOTE:
*:
Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
MPI –
Troubleshooting
13B-16
Code No. 0120 Throttle position sensor system
Probable cause
Range of Check
Ignition switch: ON
Excluding 2 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
Set Conditions
Engine speed is 1,000 r/min or less, and intake air pressure is 48kPa or
less, TPS output voltage is 4.6 V or more for 2 seconds.
or
The sensor output voltage is 0.2 V or less for 2 seconds.
Malfunction of throttle position sensor
Open or short circuit in the throttle position
sensor circuit or loose connector contact
Malfunction of the engine-ECU
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
To the next page
OK
Check the harness wire between
the throttle position sensor and the
engine-ECU.
NG
Repair
(2) NG
Check the following connector:
B-31
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness wire between
the throttle position sensor and the
engine-ECU.
NG
Repair
NG
Check the following connector:
B-31
NG
Repair
OK
Check the harness wire between
the throttle position sensor and the
engine-ECU, and repair if necessary.
NG
Repair
OK
Check the following connector:
B-31
(1) NG
Measure at engine-ECU connector
B-31.
Measure the voltage at the
engine-ECU connector terminal.
Ignition switch: ON
The voltage between terminal 81
and earth
OK: 4.8 – 5.2 V
OK
Measure at throttle position sensor
connector A-66.
Disconnect the connector and
measure at the harness side.
(1) The voltage between terminal 1
and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
(2) Resistance between terminal 4
and earth
OK: 2
Ω
or less
OK
Check the following connector:
A-66
NG
Repair
NG
Check throttle position sensor.
(Refer to P.13B-72*.)
NG
Replace
MUT-
II
Data list
14 Throttle position sensor
OK: Refer to P.13B-65, DATA
LIST REFERENCE TABLE.
OK
Intermittent malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
NOTE:
*:
Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
MPI –
Troubleshooting
13B-17
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector:
B-31
NG
Repair
NG
Check the following connector:
B-31
NG
Repair
OK
Measure at engine-ECU connector
B-31.
Measure the voltage at the
engine-ECU terminal.
Ignition switch: ON
The voltage between terminal 84
and earth
OK: Accelerator pedal fully re-
leased: 0.3 – 1.0 V
Accelerator pedal fully de-
pressed: 4.5 – 5.5 V
OK
Check the harness wire between
throttle position sensor and the
engine-ECU, and repair if necessary.
OK
Measure at throttle position sensor
connector A-66.
Use test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.
Ignition switch: ON
(1) The voltage between terminal 1
and earth
OK: 4.8 – 5.2 V
(2) The voltage between terminal 4
and earth
OK: 0.5 V or less
(3) The voltage between terminal 2
and earth
OK: Accelerator pedal fully re-
leased: 0.3 – 1.0 V
Accelerator pedal fully de-
pressed: 4.5 – 5.5 V
(1), (2) NG
NG
Repair
Check the following connector:
B-31
NG
Repair
OK
Check the harness wire between
throttle position sensor and the
engine-ECU.
From the previous page
(3) NG
Adjust the throttle position sensor.
(Refer to P.13B-65*.)
OK
Check the harness wire between
throttle position sensor and the
engine-ECU, and repair if necessary.
Check the following connector:
B-31
NOTE:
*:
Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
MPI –
Troubleshooting
13B-18
Code No. P0125 Feedback system
Probable cause
Range of Check
The engine coolant temperature is approx. 80
C or more.
During stoichiometric feedback control
The vehicle is not being decelerated.
Set Conditions
Oxygen sensor (front) output voltage has been higher or lower than 0.5 V
for at least thirty seconds.
Malfunction of oxygen sensor (front)
Open or short circuit in the oxygen sensor (front)
circuit or loose connector contact
Malfunction of engine-ECU
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)
OK
Check the following connector:
B-31
Repair
NG
OK
Check the harness wire between
the oxygen sensor (front) and the
engine-ECU, and repair if necessary.
NG
Check the following connector:
B-31
NG
Repair
OK
Measure at engine-ECU connector
B-31.
Measure the voltage at the
engine-ECU terminal.
Engine: 2,500 r/min (after
warming up)
Voltage between terminal 76 and
earth
OK: 0 V and 0.8 V alternate.
OK
Check the harness wire between
the oxygen sensor (front) and the
engine-ECU, and repair if necessary.
OK
NG
Repair
Check the following connector:
B-31
OK
Check the harness wire between
the oxygen sensor (front) and the
engine-ECU, and repair if necessary.
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the harness wire between
the oxygen sensor (front) and the
engine-ECU.
NG
Repair
Repair
OK
Measure at oxygen sensor (front)
connector A-55.
Disconnect the connector and
measure at the harness side.
Resistance between terminal 2
and earth
OK: 2
Ω
or less
NG
Check the following connectors:
B-31
NG
Check the following connector:
A-55
NG
Repair
(2) NG
Check the oxygen sensor (front).
(Refer to P.13B-80.)
NG
Replace
Repair
OK
Measure at oxygen sensor (front)
connector A-55.
Use the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.
Engine: 2,500 r/min (after
warming up)
(1) Voltage between terminal 2 and
earth
OK: 0.5 V or less
(2) Voltage between terminal 4 and
earth
OK: 0 V and 0.8 V alternate.
(1) NG
Check the following connector:
B-31
NG
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст