Mitsubishi Eclipse 1990 Service Manual page 441

Scan tool 106
Code General scan tool
No.
43
[Comment]
Background
Excessive engine misfire results in increased catalyst temperature.
Severe misfire could cause catalyst damage.
To prevent catalytic converter damage, the PCM monitors engine misfire.
The PCM monitors for misfire during most engine operating conditions.
When a misfire is detected, the PCM stores a diagnostic trouble code and causes the
to either flash or illuminate continuously during active misfire.
Range of Check
MAP voltage is less than 1.60
Engine speed is between 2200 and 2800
Engine coolant temperature is greater than
Vehicle speed less than
Set Condition
1000 Rev Misfire
The PCM detects misfire in more than 1.6% of the engine cycles in a 1000 revolution
period.
200 Rev Misfire
The PCM detects misfire in more than 15% of the engine cycles in a 200 revolution period.
SCAN TOOL SENSOR READ TESTS (Data list)
05 Engine coolant temperature sensor (Refer to
SCAN TOOL SENSOR READ TESTS (Data list)
27 Intake air temperature sensor (Refer to
SCAN TOOL SENSOR READ TESTS (Data list)
11 MAP sensor reading (Refer to
SCAN TOOL SENSOR READ TESTS (Data list)
66 Oxygen sensor volts (front) (Refer to
OK: Repeat and
idling.
Check the fuel pressure. (Refer to
Check the injectors for operation sound.
Check the injectors for fuel leakage.
Check the evaporative emission control system.
ENGINE (NON-TURBO)>
Multiple Cylinder Mlsfire
OK
OK
OK
alternately when
TSB Revision
Spark plugs or wires failed
Timing belt tooth broken,
Check the engine coolant temperature circuit.
(Refer to
Check the intake air temperature circuit.
(Refer to
Check the MAP sensor circuit.
(Refer to
OK
Check the following connectors:
Check the harness wire between the PCM and the crankshaft
position sensor connector.
Check the following items.
Check the ignition coil, spark plug cables.
Check the compression pressure.
Check the EGR
Ignition coil failed
Crankshaft position
piston rings
valves
Head gasket failed
C r a c k e d
Fuel lines and filter failed
Fuel failed
failed
Wiring and connectors failed
Engine coolant
EGR
INSPECTION PROCEDURE 38.)
INSPECTION PROCEDURE
INSPECTION PROCEDURE 40.)
.