Check Engine Lights

1994 TOYOTA COROLLA
163,657 MILES
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KAIKIING
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Hi,
I've do a jumper at the diagnostic panel of my car and I found the engine light blink 3 times continuously and then 1 time.May i know what might the code is and what will be the problems is.I dont ve any service manual for the car.Can anyone help?

Thanks.
Sep 29, 2011 at 10:57 AM
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KHLOW2008
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That is code 31, a fault with the air flow meter.

https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995

The above link has definations for the trouble codes.

Sep 29, 2011 at 12:25 PM
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KHLOW2008
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Sorry for the mistake. Our DIY link only provides a brief explanation of the problem.

Our database indicates it is a fault with the MAP sensor.

If you would like to have the diagnostic procedures, let me know.
Sep 29, 2011 at 12:27 PM
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KAIKIING
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Hi,

Please let me know the diagnostic procedures.
Thanks
Sep 29, 2011 at 1:22 PM
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KAIKIING
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Hi,

What might happen if the MAP sensor is not functioning?Please advice.

Thanks
Sep 29, 2011 at 1:59 PM
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KHLOW2008
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DTC 31 - MAP SENSOR SIGNAL

MAP sensor detects the intake manifold absolute pressure as a voltage. ECM determines basic injection duration and basic ignition advance angle based on this voltage. DTC 31 sets when there is an open or short in MAP sensor circuit for .5 second or more. Check for an open or shorted MAP sensor circuit, a faulty MAP sensor or ECM.
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Sep 29, 2011 at 2:57 PM
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KHLOW2008
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If MAP is not functioning correctly, you would have driveability and performance problems with erratic idling and stalling.
Sep 29, 2011 at 3:00 PM
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KAIKIING
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Hi,

Is it high chance for the ECM to be malfunction?Or more chance for the MAP?

Thanks..
Sep 29, 2011 at 10:56 PM
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KAIKIING
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Hi,

May I know when i check the ECM,I need to unplug the 3 socket on ECM or must check with the cable plug in?

Thanks a lot.
Sep 29, 2011 at 11:17 PM
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KHLOW2008
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With wire harness connected.

Only testing would be able to tell you what is wrong.

It could be a loose or contaminated MAP wire connector.
Sep 30, 2011 at 1:53 PM
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KAIKIING
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I've try to switch the MAP sensor with another car which dont have error code 32 on it and also unplug the fuse of (EFI or F-HTR)for few minutes then plug it back follow by jumper test and still getting flash 32.Did my way of clearing the error code in the ECM correct?Will that mean I've to change my ECM?
Sep 30, 2011 at 2:35 PM
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KAIKIING
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Is there anyway for us to check the sensor itself?Any procedure or guide for the part?Thanks..Please let me know.
Sep 30, 2011 at 2:52 PM
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