Mitsubishi Space Star. Manual — part 67
MPI –
Troubleshooting
13B-55
INSPECTION PROCEDURE 19
Surge
Probable cause
Defective ignition system, abnormal air-fuel ratio, etc. are suspected.
Malfunction of the ignition system
Malfunction of air-fuel ratio control system
Malfunction of the EGR control solenoid valve system
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Check the injectors for operation sound.
NG
Check the injector system. (Refer to P.13B-26, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P020, P0202, P0203, P0204.)
OK
Check the ignition timing.
(Refer to GROUP 11B – On-vehicle Service.)
NG
Check that the distributor is installed properly.
OK
Check the fuel pressure. (Refer to P.13B-67*.)
OK
Check the following items.
Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 – On-vehicle Service.)
Check the EGR control system. (Refer to GROUP 17 – Emission Control System.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13B-65.)
NG
Check the intake air temperature sensor system.
(Refer to P.13B-12, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0110.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13B-65.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
MUT-
II
Data list
14 Throttle position sensor (Refer to P.13B-65.)
NG
Check the throttle position sensor system. (Refer to P.13B-16,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)
OK
MUT-
II
Actuator test
10 EGR control solenoid valve (Refer to P.13B-70.)
NG
Check the EGR control solenoid valve system. (Refer to P.13B-32,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0403.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
Transmission: 2nd gear
Driving with throttle widely open
OK: 600 – 1,000 mV
NG
Check the oxygen sensor (rear) system. (Refer to P.13B-22, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK: 600 – 1,000 mV during sudden racing
NG
Check the oxygen sensor (front) system. (Refer to P.13B-19, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK: Changes between 0 – 400 mV and 600 – 1,000 mV
during idling
NG
Check the fuel pressure.
(Refer to P.13B-67*.)
OK
1. Inspect the intake of
air into the air intake
system.
Broken intake man-
ifold gasket
Broken vacuum hose
PCV valve does not
operate.
Broken air intake
hose
2. Check the injector for
clog.
NOTE:
*:
Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
MPI –
Troubleshooting
13B-56
INSPECTION PROCEDURE 20
Knocking
Probable cause
In cases as the above, the cause is probably that the detonation control is defective
or the heat value of the spark plug is inappropriate.
Defective detonation sensor
Inappropriate heat value of the spark plug
Check the following items.
Spark plugs
Check if foreign materials (water, alcohol, etc.) got into fuel.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Does knocking occur when driving with the detonation sensor
connector disconnected? At this time, use the MUT-
II
to check
if the timing is retarded compared to when the detonation sensor
connector is disconnected.
No
Check the detonation sensor system. (Refer to P.13B-29, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)
Yes
INSPECTION PROCEDURE 21
Dieseling
Probable cause
Fuel leakage from injectors is suspected.
Fuel leakage from injectors
Check the injectors for fuel leakage.
MPI –
Troubleshooting
13B-57
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
Probable cause
Abnormal air-fuel ratio is suspected.
Malfunction of the air-fuel ratio control system
Deteriorated catalyst
Check trouble symptom.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check the fuel pressure. (Refer to P.13B-67*.)
OK
NG
Check the trouble symptom.
NG
Replace the catalytic converter.
No
Check the ignition timing.
(Refer to GROUP 11B – On-vehicle Service.)
NG
Check that the distributor is installed properly.
OK
MUT-
II
Data list
21 Engine coolant temperature sensor. (Refer to P.13B-65.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13B-65.)
NG
Check the intake air temperature sensor system.
(Refer to P.13B-12, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0110.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
Transmission: 2nd gear
Driving with throttle widely open
OK: 600 – 1,000 mV
NG
Check the oxygen sensor (rear) system. (Refer to P.13B-22, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK: 600 – 1,000 mV when racing suddenly
NG
Check the oxygen sensor (front) system. (Refer to P.13B-19, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor (front)
OK: Repeat 0 – 400 mV and 600 – 1,000 mV alternately
when idling.
OK
Replace the oxygen sensor.
Check the following items.
Check the injectors for operation sound.
Check the injectors for fuel leakage.
Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 – On-vehicle Service.)
Check the compression pressure. (Refer to GROUP 11B – On-vehicle Service.)
Check the positive crankcase ventilation system. (Refer to GROUP 17 – Emission Control System.)
Check the purge control system. (Refer to GROUP 17 – Emission Control System.)
Check the EGR control system. (Refer to GROUP 17 – Emission Control System.)
NOTE:
*:
Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
MPI –
Troubleshooting
13B-58
INSPECTION PROCEDURE 23
Fans (radiator fan, A/C condenser fan) are inoperative.
Probable cause
The fan motor relay is controlled by the power transistor inside the engine-ECU
turning ON and OFF.
Malfunction of the fan motor relay
Malfunction of the fan motor
Malfunction of the thermostat
Improper connector contact, open circuit or
short-circuited harness wire
Malfunction of the engine-ECU
OK
Check the trouble symptoms.
OK
Check the following connector: B-28
NG
Repair
Measure at the engine-ECU connector B-28.
Disconnect the connector, and measure at the harness side.
Check the condition of the fans (radiator fan and A/C condenser
fan). (Ignition switch: ON)
OK: Fans are stopped
Voltage between 20 and earth, 21 and earth
(Ignition switch: ON)
OK: System voltage
Connect a jumper wire between 20 and earth
(Ignition switch: ON)
OK: Radiator fan and condenser fan run at high speed.
Connect a jumper wire between 21 and earth
(Ignition switch: ON)
OK: Radiator fan and condenser fan run at low speed.
NG
Check the radiator fan circuit. (Refer to ELECTRICAL WIRING.)
Check the A/C condenser fan circuit.
(Refer to ELECTRICAL WIRING.)
NG
MUT-
II
Data list
21 Engine coolant temperature sensor
OK: After the engine has warmed up, the engine coolant tempera-
ture durning idling is identical to the MUT-
II
reading.
NG
Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
Replace the engine-ECU.
OK
Check the thermostat.
NG
Replace
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