Mitsubishi Eclipse 1990 Service Manual page 555

Code No.
der-l,
[Comment]
Background
if a misfiring occurs while the engine is running, the engine speed suddenly changes.
The engine control module checks for changes in the engine speed.
Check Area
5 or more have passed after the engine was started.
Engine speed is at between 500 and 6000
Engine coolant temperature is
Intake air temperature is
Barometric pressure is 76
Running free from sudden accelerations/decelerations such as shift change.
Judgement Criteria
(change in the angular acceleration of the crankshaft is used for misfire detection.)
Misfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than
or
Misfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.)
Check the injector (Refer
Check the following connectors:
[Check the harness wire between the ECM and the injector
connector
Check the following items.
Check the spark plugs, spark plug cables.
Check the compression pressure
Code No. Knock Sensor 1 Circuit Malfunction
Engine (Turbo)>
Background
The knock sensor converts the vibration of the cylinder block into a voltage and outputs
it. If there is a malfunction of the knock sensor, the voltage output will not change.
The engine control module checks whether the voltage output changes.
Check Area
Ignition switch: ON
60 or more have passed after the ignition switch was turned on or the starting sequence
was
Engine speed is higher than 2000
Judgement Criteria
Knock sensor output voltage (knock sensor peak voltage in each
crankshaft) has not changed more than 0.06
ENGINE (TURBO)
ENGINE>
Misfire Detected (Cylin-
or higher.
or higher
(11 psi.) or higher.
OK
OK
in the last consecutive 200 periods.
Revision
Replace
Repair
NG
Open or shorted knock sensor circuit, or
connector
Engine control module failed
deg period of the
Low compression
Injector failed
Engine
__
,
sensor failed
,