Mitsubishi 3000GT Service Manual page 143

MULTIPORT FUEL INJECTION - Troubleshooting
DTC No.
PO115 Engine Coolant Temperature Circuit Malfunction
and outputs it.
addition, it checks the engine coolant temperature (signal) does not drop while the engine
is warming up.
Range of check
Ignition switch: ON
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Excluding 60 seconds after the ignition switch is turned to ON or immediately after
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the engine starts.
Set conditions
Sensor output voltage is 4.6 V or more (corresponding to an engine coolant temperature
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of -45°C (49OF) or less for 4 seconds.
or
Sensor output voltage is 0.1 V or less (corresponding to an engine coolant temperature
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of 140°C (284'F) or more for 4 seconds.
Range of check
Ignition switch: ON
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Engine speed is approx. 50 r/min or more.
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Set conditions
The sensor output voltage increases from 1.6 V or less (corresponding to an engine
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coolant temperature of 40°C (104°F) or more) to 1.6 V or more (correponding to an
engine coolant temperature of 40°C (104°F) or less).
After this, the sensor output voltage is 1.6 V or more for 5 minutes.
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Range of check
Engine coolant temperature is 20% (68°F) or more when the engine is started.
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Intake air temperature is 20°C (68°F) or more when the engine is started.
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Set conditions
The engine coolant temperature takes 5 minutes or more to rise to approximately 50°C
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DTC No.
Throttle Position Circuit Malfunction
Background
The throttle position sensor outputs a voltage which corresponds to the throttle valve opening
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angle.
The engine control module checks whether the voltage is within a specified range. In
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addition, it checks that the voltage output does not become too large while the engine
is idling.
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
When the closed throttle position switch is ON, the sensor output voltage is 2 V or more
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for 4 seconds.
or
The sensor output voltage is 0.2 V or less for 4 seconds.
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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.
Engine speed is approx. 500-3,000 r/min or more.
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During low load operations
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Set Conditions
The sensor output voltage is 4.6 V or more for 10 seconds.
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Title
Title
TSB Revision
Probable causes
Engine coolant temperature
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sensor failed.
Open or shorted the engine
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coolant temperature sensor
circuit, or loose connector.
Engine control module failed.
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Probable causes
Throttle position sensor failed
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or maladjusted.
Open or shorted throttle position
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sensor circuit, or loose connec-
tor.
Closed throttle position switch
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ON malfunction.
Closed throttle position switch
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signal wire shorted.
Engine control module failed.
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