Mitsubishi 3000GT Service Manual page 142

MULTIPORT FUEL INJECTION - Troubleshootinn
DIAGNOSTIC DETECTION LOGIC
DTC No.
Volume Air Flow Circuit Malfunction
Background
While the engine is running, the volume air flow sensor outputs a pulse signal which
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corresponds to the volume of air flow.
The engine control module checks whether the frequency of this signal output by the
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volume air flow sensor while the engine is running is at or above the set value.
Range of Check
Engine speed is 500 r/min or more.
Set Conditions
Sensor output frequency is 3 Hz or less for 4 seconds.
DTC No.
Barometric Pressure Circuit Malfunction
Background
The barometric pressure sensor outputs a voltage which corresponds to the barometric
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pressure.
The engine control module checks whether this voltage is within a specified range.
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Range of Check
Ignition switch: ON
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Excluding 60 seconds after the ignition switch is turned to ON or immediately after the
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engine starts.
Battery voltage is 8 V or more.
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Set Conditions
Sensor output voltage is 4.5 V or more (corresponding to a barometric pressure of 114
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or
Sensor output voltage is 0.2 V or less (corresponding to a barometric pressure of 5.33
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DTC No.
PO110 Intake Air Temperature Circuit Malfunction
Background
The intake air temperature sensor converts the intake air temperature to a voltage and
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outputs it.
The engine control module checks whether the voltage is within a specified range.
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Range of Check
Ignition switch: ON
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Excluding 60 seconds after the ignition switch is turned to ON or immediately after the
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engine starts.
Set Conditions
Sensor output voltage is 4.6 V or more (corresponding to an intake air temperature of
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or
Sensor output voltage is 0.2 V or less (corresponding to an intake air temperature of 125°C
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Title
Title
Title
TSB Revision
Probable causes
Volume air flow sensor failed.
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Open or shorted volume air flow
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sensor circuit, or loose connec-
tor.
Engine control module failed.
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Probable causes
Barometric pressure sensor
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failed.
Open or shorted barometric
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pressure sensor circuit, or loose
connector.
Engine control module failed.
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Probable causes
Intake air temperature sensor
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failed.
Open or shorted the intake air
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temperature sensor circuit, or
loose connector.
Engine control module failed.
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