Mitsubishi 3000GT Service Manual page 133

MULTIPORT FUEL INJECTION - Troubleshooting
Fault ID
43
EGR System
Non Turbo,
Backaround
EGR temperature sensor converts the EGR gas temperature
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to a voltage and outputs it.
Engine control module checks whether an output voltage of
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the EGR temperature sensor is within a specified range.
Range of Check
Approx. 6 minutes or more have passed after engine was started.
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Intake-air temperature is O-55% (32-131°F).
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Barometric pressure is 93.3 kPa (27.6 in.Hg) or more.
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Engine speed is approx. 1,900-2,100 r/min.
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Vehicle is moving at constant speed on a flat, level road surface.
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The above conditions continue for a continuous period of 15
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seconds.
Set Conditions
Sensor output voltage is approx. 3.5 V (corresponding to an
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EGR temperature of 70°C (158'F)) or more.
When the range of check operation. given above which
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accompany starting of the engine are carried out two times in
succession, a problem is detected after each operation.
Background
Ignition power transistor unit converts ON/OFF variation of the
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ignition coil to the pulse signal (Ignition signal) and outputs it.
The engine control module detects whether ignition occurs or
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not by checking this signal while the engine is running.
Range of Check
Engine speed is approx. 50-4,000 r/min.
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Engine is not cranking.
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Set Conditions
The ignition signal from the same coil is not input for 4 seconds.
However, this excludes cases where no ignition signal is input from
any coils.
Title
No limp-in
TSB Revision
Effect
EGR valve does not open.
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EGR control vacuum istoo low.
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EGR solenoid failed.
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EGR temperature
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failed.
temperature sensor circuit, or
loose connector.
Engine control module failed.
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Effect
Ignition coil failed
Limp-in
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Disconnection or short circuit
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Cuts fuel of an ignition
of the primary ignition circuit,
signal abnormal cylin-
or imperfect contact of the
der.
connector.
failed.
Engine control module failed.
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Probable causes
sensor
shorted EGR
Probable causes