Mitsubishi Space Star. Manual — part 79
DIESEL FUEL –
Troubleshooting
13D-15
Code No. 18 Air flow sensor system
Probable cause
Range of Check
Ignition switch: ON
Set Conditions
Sensor output voltage is 100 mV or less for 1.5 seconds
or
Sensor output voltage is 1,200 mV or more for 1.5 seconds
Range of Check
Engine speed : 700 r/min or more
Set Conditions
Sensor output is 10 kg/h or less for 1 second
Malfunction of the air flow sensor
Improper connector contact, open circuit or
short-circuited harness wire of the air flow sensor
circuit
Malfunction of the engine-ECU
(2) NG
Repair
Measure at the air flow sensor connector A-73.
Disconnect the connector and measure at the harness
side.
(1) Voltage between 4 and earth (Ignition switch: ON)
OK: System voltage
(2) Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
(3) Continuity between 6 and earth
OK: Continuity
(1) NG
OK
Repair
NG
Check the following connectors: A-73, A-121
NG
Repair
NG
NG
OK
Check the harness wire between the air flow sensor and the
engine-ECU (sensor signal line).
OK
Check trouble symptom.
Check the harness wire between the air flow sensor and the
main relay, and repair if necessary.
Check the following connectors: A-120, A-121
OK
NG
Check the harness wire between the air flow sensor and the
engine-ECU.
Repair
OK
NG
Replace the engine-ECU.
NG
Check trouble symptom.
NG
Replace the engine-ECU.
OK
NG
INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*
MUT-
II
Data list
08 Air flow sensor (Refer to P.13D-46.)
(3) NG
Check the harness wire between the air flow sensor and the
earth, and repair if necessary.
*:
Refer to ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
DIESEL FUEL –
Troubleshooting
13D-16
Code No. 19 Engine coolant temperature sensor system
Probable cause
Range of Check
Ignition switch: ON
Set Conditions
Sensor output voltage is 100 mV or less for 1 second
or
Sensor output voltage is 4,900 mV or more for 1 second
Malfunction of the engine coolant temperature
sensor
Improper connector contact, open circuit or
short-circuited harness wire of the engine coolant
temperature sensor circuit
Malfunction of the engine-ECU
NG
Check the following connector: A-121
Replace
NG
OK
Measure at the engine coolant temperature sensor connector A-76.
Disconnect the connector and measure at the harness
side.
Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between 2 and earth
OK: Continuity
OK
NG
Check the harness wire between the engine coolant
temperature sensor and the engine-ECU.
Repair
NG
Check the following connector: A-76
OK
Check the engine coolant temperature sensor (Refer to
P.13D-52.)
OK
Check trouble symptom.
Repair
NG
Replace the engine-ECU.
OK
INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*
MUT-
II
Data list
01 Engine coolant temperature sensor (Refer to P.13D-46.)
OK
Repair
NG
Replace the engine-ECU.
NG
Check trouble symptom.
NG
*:
Refer to ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
DIESEL FUEL –
Troubleshooting
13D-17
Code No. 21 Fuel temperature sensor system
Probable cause
Range of Check
Ignition switch: ON
Set Conditions
Sensor output voltage is 100 mV or less for 1 second
or
Sensor output voltage is 4,900 mV or more for 1 second
Malfunction of the fuel temperature sensor
Improper connector contact, open circuit or
short-circuited harness wire of the fuel
temperature sensor circuit
Malfunction of the engine-ECU
NG
Check the following connector: A-121
Replace
NG
OK
Measure at the fuel temperature sensor connector A-117.
Disconnect the connector and measure at the harness
side.
Voltage between 1 and earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between 2 and earth
OK: Continuity
OK
NG
Check the harness wire between the fuel temperature sensor
and the engine-ECU.
Repair
NG
Check the following connector: A-117
OK
Check the fuel temperature sensor (Refer to P.13D-53.)
OK
Check trouble symptom.
Repair
NG
Replace the engine-ECU.
OK
INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*
MUT-
II
Data list
02 Fuel temperature sensor (Refer to P.13D-46.)
OK
Repair
NG
Replace the engine-ECU.
NG
Check trouble symptom.
NG
*:
Refer to ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
DIESEL FUEL –
Troubleshooting
13D-18
Code No. 22 Intake air temperature sensor system
Probable cause
Range of Check
Ignition switch: ON
Set Conditions
Sensor output voltage is 100 mV or less for 1 second
or
Sensor output voltage is 4,850 mV or more for 1 second
Malfunction of the intake air temperature sensor
Improper connector contact, open circuit or
short-circuited harness wire of the intake air
temperature sensor circuit
Malfunction of the engine-ECU
NG
Check the following connectors: A-120, A-121
Replace
NG
OK
Measure at the air flow sensor connector A-73
Disconnect the connector and measure at the harness
side.
Voltage between 1 and earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between 2 and earth
OK: Continuity
OK
NG
Check the harness wire between the intake air temperature
sensor and the engine-ECU.
Repair
NG
Check the following connector: A-73
OK
Check the intake air temperature sensor (Refer to P.13D-52.)
OK
Check trouble symptom.
Repair
NG
Replace the engine-ECU.
OK
INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*
MUT-
II
Data list
03 Intake air temperature sensor (Refer to P.13D-46.)
OK
Repair
NG
Replace the engine-ECU.
NG
Check trouble symptom.
NG
*:
Refer to ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)
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