Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 377

13A-18
Code No.21 Engine coolant temperature sensor system
Range of check
After 60 seconds have passed since the engine have started
Set conditions
Sensor resistance is 50 Ω or less for 4 seconds.
or
Sensor resistance is 72 kΩ or more for 4 seconds.
Range of check
After engine starts
Set conditions
After 5 minutes or more have passed since the engine coolant temperature
after filtering has dropped from 40_C or more to less than this temperature
Check the engine coolant temperature sensor. (Refer to P.13A-106.)
Measure at the engine coolant temperature sensor connector A-76.
Disconnect the connector, and measure st the harness
side.
Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between 2 and earth
OK: Continuity
Check the following connector: A-76
OK
Check trouble symptom.
GDI –
OK
OK
NG
Repair
Troubleshooting
Probable cause
Malfunction of the engine coolant temperature
sensor
Open circuit or short-circuited harness wire of the
engine coolant temperature sensor circuit
Malfunction of the engine-ECU
NG
Replace
NG
Check the following connector: B-31
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and the engine
coolant temperature sensor.
OK
NG
Replace the engine-ECU.
NG
Repair
NG
Repair