Mitsubishi Eclipse 1990 Service Manual page 542

Code No. Volume Air Flow Circuit Malfunction
[Comment]
Background
While the engine is running, the volume air flow sensor outputs a
corresponds to the volume of air flow.
The engine control module checks whether the frequency of this signal output by the
volume air flow sensor while the engine is running is at or above the set value.
Check Area, Judgement Criteria
1. Check Area
Engine is not lower than 500
Judgement Criteria
Sensor output frequency has continued to be 3.3 Hz or lower for 4 sec.
2. Check Area
Throttle position sensor voltage is 2
Engine speed is not higher than 2000
Judgement Criteria
Sensor freauencv has continued to be 1000 Hz or hiaher for 4 sec.
Engine
Sensor output frequency has continued to be 800 Hz or higher for 4 sec.
3. Check Area
Throttle position sensor voltage is 1.5
Engine speed is 2000
Judgement Criteria
Sensor output frequency is
Measure at the volume air flow
sensor connector A-l 02.
Connect the connector. (Use
the test harness:
1. Voltage between 3 and ground
(Engine: idling)
OK: 2.2-3.2
2. Voltage between 7 and ground
OK: (Engine: idling)
6 - 9
OK
Replace the ECM.
ENGINE (TURBO)
AND ENGINE>
or lower.
or higher.
or higher.
Hz or lower for 4 seconds.
Check the volume air flow sensor
circuit. (Refer to
PROCEDURE 47.)
(Ignition switch: ON)
OK: 6-9
Check the following connector
, Check trouble
Replace the ECM.
TSB Revision
Troubleshooting
Probable cause
Volume air, flow
Open or shorted
signal which
or loose connector
Engine control module failed
Engine>
Check trouble symptom.
NG
Repair
Replacethevolumeairflowsensor.
sensor
Repair