Mitsubishi 3000GT Service Manual page 146

MULTIPORT FUEL INJECTION - Troubleshooting
DTC No.
Fuel Trim Malfunction (Bank 1)
Background
If a malfunction occurs in the fuel system, the fuel compensation value bacomes too large
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or too small.
The engine control module checks whether the fuel compensation value is within a specified
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range.
Range of Check, Set Conditions
The fuel compensation value exceeds the specified range for 10 seconds during closed-loop
control of the air-fuel ratio.
Background
If a malfunction occurs in the fuel system, the fuel compensation value bacomes too large
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or too small.
range.
Range of Check, Set Conditions
The fuel compensation value exceeds the specified range for 10 seconds during closed-loop
control of the air-fuel ratio.
DTC No.
PO201 -
Injector Circuit Malfunction Cylinder-l - Cylinder-6
PO206
Background
A surge voltage is generated when the injectors are driven and the current flowing to
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the injector coil is shut off.
The engine control module checks this surge voltage.
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Range of Check
Engine speed is approx. 50-1,000 r/min.
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The throttle position sensor output voltage is 1.15 V or less.
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Actuator test by scan tool is not carried out.
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Set Conditions
Surge voltage of injector coil is not detected for 4 seconds.
DTC No.
Random Misfire Detected
PO300
Background
The engine control module checks for changes in the engine speed.
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Range of Check, Set Conditions
There are multiple cylinders for which the number of misfires for every 200 r/min of the
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engine exceeds the specified number.
the engine exceeds the specified number.
Title
Title
Title
TSB Revision
Probable causes
Volume air flow sensor failed.
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Injector failed.
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Air drawn in from gaps in gasket
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seals, etc.
Heated oxygen sensor failed.
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Engine coolant temperature
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sensor failed.
Intake air temperature sensor
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failed
Barometric pressure
sensor
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failed.
Probable causes
ygen sensor failed.
Engine coolant temperature
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sensor failed.
Engine control module failed.
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ntake air temperature sensor
Probable causes
Injector failed.
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Open or shorted throttle position
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sensor circuit, or loose connec-
tor.
Engine control module failed.
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Probable causes
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signal.
Low compression pressure.
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Engine control module failed.
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