Question about 1991 Subaru Loyale
My check engine light is on and my manual says to use the mil to get trouble codes. what is the mil and how do i get the codes?
Mil is the malfunstion indicator lamp (check engine light) there is a connector either under the dash or under the hood near firewall that is normally not plugged in to anything. Use a paperclip to jumper this and the engine light will flash codes. i think the connector is green but check a repair manual to be sure. there are other connectors that you don't want to mess with by accident
Posted on Oct 16, 2008
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Posted on Jan 02, 2017
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Jun 28, 2017 | Cars & Trucks
The MIL turns OFF after the engine is started if a diagnostic fault is not present.
The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
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Malfunction Indicator Lamp Circuit Malfunction (TCM)
MIL control circuit is shorted to ground.Check the TCM for any trouble codes in memory that are responsible for the request to turn on the MIL.TCM has failed.Trouble Code: P1780
Engine Torque Signal Circuit Malfunction
.Perform the Diagnostic System Check for the Engine Controls.TCM needs to be replaced.Trouble Code: P1795
Throttle Plate Position Invalid Data Received
Perform the Diagnostic System Check for the Engine Controls.TCM may need to be replaced to repair this trouble code.Trouble Code: P2176
Throttle Position Sensor Minimum Position Not Detected
TAC motor control circuit (one or more) open or shorted to B+.TAC motor control circuit (one or more) shorted to ground.Throttle valves not at the "rest" position.Throttle valve are binding open, or are binding closed.Throttle valves moving open or closed without spring pressure.TP connector is damaged, open or shorted.Throttle body assembly is damaged or it has failed.PCM has failed.Couldn't find code P1779.
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READING CODES USING MIL (CHECK ENGINE) LAMP
Be advised that the MIL or CHECK ENGINE light can only perform a limited number of functions and it is a good idea to have the system checked with a scan tool to double check the circuit function.
Fig. Fig. 3: Diagnostic trouble code chart (2 of 2)-1995-97 2.0L engines
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