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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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