Mitsubishi Eclipse 1990 Service Manual page 566

Code No. Evaporative Emission
Pressure Sensor Malfunction
[Comment]
Background
The fuel tank differential pressure sensor outputs the voltage in proportion to the pressure
in the fuel tank. (differential pressure against the barometric pressure)
The engine control module checks whether the output voltage of the fuel tank differential
pressure sensor is within the specified range
Check Area, Judgement Criteria
1. Check Area
Engine speed is not lower than 1500
Volumetric efficiency is between 25
Judgement Criteria
The sensor output voltage is 4.5
air temperature is between 5"
purge solenoid is being driven at 100% duty.
or
The sensor output voltage is 0.5
air temperature is (41
is not being driven.
2. Check Area
The pressure fluctuates 20 times or more at 0.2
Closed position switch: ON
Judgement Criteria
The pressure fluctuates 20 times or more (0.2
operations.
Disconnect the connector and measure at the harness side.
2. Continuity between 2 and ground
OK: Continuity
OK
NG
Check the following
NG
NG
Check the harness
between fuel tank differ-
ential sensor
and
Replace the fuel tank differential pressure sensor.
ENGINE (TURBO)
AND ENGINE>
Engine>
or higher for 10 seconds even though the intake
and the evaporative emission
or lower for 10 seconds even though the intake
or higher and the evaporative emission purge solenoid
or higher.
or higher) for 15 consecutive idle
Repair
Repair
TSB Revision
Troubleshooting
Fuel tank differential pressure
or shorted fuel
Open
Engine control module
NG
NG
Check the harness wire
between fuel tank differ-
/ Check
Check the harness wire between fuel tank differential pressure
sensor and ground. Repair, if necessary.
o r
,
.