Mitsubishi Eclipse 1990 Service Manual page 545

Code No. 5 Engine Coolant Temperature Circuit
Malfunction
[Comment]
Background
and outputs it.
The engine control module checks whether the voltage is within a specified range.
In addition, it checks that the engine coolant temperature (signal) does not drop while
the engine is warming up.
Check Area, Judgement Criteria
1. Check Area, Judgement Criteria
Sensor output voltage has continued to be 4.6
coolant temperature of
or
Sensor output voltage has continued to be 0.1
coolant temperature of
2. Check Area, Judgement Criteria
Sensor output voltage increased from a value lower than 1.6
1.6 [Engine coolant temperature decreases from a higher than
temperature to a lower than
Then the sensor output voltage has continued to be 1.6
3. Check Area
Engine coolant temperature is approximately
is started.
Judgement Criteria
About 60 300 have passed for the engine coolant temperature to
after starting sequence was completed.
Measure at the engine coolant
temperature sensor connector
Disconnect the connector, and
measure at the harness side.
Voltage between 1 and ground
(Ignition switch: ON)
OK:
Continuity between 2 and ground
OK: Continuity
Check trouble symptom.
NG
Replace the
ENGINE (TURBO)
AND ENGINE>
theenginecoolanttemperature
or higher [corresponding to an engine
or lower] for 4 sec.
or lower [corresponding to an engine
or higher] for 4 sec.
to a value higher than
temperature.]
or higher for 5 min.
immediately after engine
Replace the ECM.
TSB Revision
Probable
Engine coolant temperature
Open shorted engine
sensor circuit, or
Engine control module
about