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Tech Forums => 6 Cylinder Tech => Topic started by: Evan on December 02, 2005, 04:23:30 AM



Title: Wiring harness problem?
Post by: Evan on December 02, 2005, 04:23:30 AM
This is in regards to my misfire code found here http://asog.net/component/option,com_smf/Itemid,30/topic,40.0 (http://asog.net/component/option,com_smf/Itemid,30/topic,40.0)I ran some tests on the MAP sensor.  I followed the instructions in my Chilton book to do them.  The instructions are as follows:

1. check connector, etc.

2. Test the MAP sensor output voltage at the sensor connector between terminals 1 and 3.

3. With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts.  The voltage should fall to 1.5 - 2.1 volts with a hot, neutral idle speed condition.  If OK, go to step 4 or 5.  If not OK, go to Step 6 or 7.
when I tested the connector, my voltmeter read zero.  When I droped it down to the lower range (2V), my output is about .003

6. Test the MAP sensor ground circuit at the sensor connector terminal 1 and PCM terminal 43.  If OK, go to Step 8.  If not OK, repair as necessary.
this test comes out fine

7. This test is for a 95 only.

8. Test the MAP sensor supply voltage between the sensor connector terminals 2 and 1 with the ignition key in the ON position.  The voltage should be about 4.5 - 5.5 volts.
This tests out fine

9. There should also be 4.5 - 5.5 volts at terminal 61 of the PCM.
This tests out fine

10. This test is for a 95 only.

11.  If not, repair or replace the wire harness as required.

So as far as I can tell, the only problem that I found was a problem way up at step 3.  So, does this sound like a wiring problem?  If so, how can this be fixed?  Do I need to replace the entire harness?


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