 How to test MPS, I think it is not working |
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| surfdogskier |
 Oct 14 2019, 06:03 PM
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#1
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Member  Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None  |
So before I go ballistic and switch over to dual carbs, I just want to check one more thing. The only thing I can see that I see could be the reason my injectors are not firing is due to the MPS.
Is there a way I can check to see if the MPS is working properly using an ohm meter or other device? I see the wire on the MPS has the numbers 7,8, 10, 15. I would like to check the continuity of these wires as well. Where is the other end locate? Thanks |
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| BeatNavy |
Oct 14 2019, 06:16 PM
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region 
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A bad MPS shouldn't cause injectors not to fire. But to your question, there are two basic tests:
1. Continuity tests of primary and secondary coils. Using an ohmmeter, you check continuity between terminals 7 and 15, and then between 8 and 10. You should get roughly 90 and 350 ohms, respectively. The terminals are there in the 4 pin connectors. So put one lead from ohmmeter on one terminal and the other lead on the other terminal. Do that once for primary and then once for secondary coils. 2. Vacuum check -- using a vacuum gauge (e.g., mityvac), pull a 15 psi vacuum and make sure it doesn't leak down more than a few psi in a minute. If it does, the diaphragm is probably ruptured, resulting in a rich condition. Here's the reference: https://members.rennlist.com/pbanders/manif..._sensor.htm#MPS Diagnostics I know you have a separate thread about injectors not firing, so I won't speculate here about causes in this thread. Good luck. I like FI, but I know it can be frustrating when not working (IMG:style_emoticons/default/sad.gif) |
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| Highland |
Nov 10 2020, 09:56 AM
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#3
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
QUOTE(BeatNavy @ Oct 14 2019, 05:16 PM)  1. Continuity tests of primary and secondary coils. Using an ohmmeter, you check continuity between terminals 7 and 15, and then between 8 and 10. You should get roughly 90 and 350 ohms, respectively. The terminals are there in the 4 pin connectors. So put one lead from ohmmeter on one terminal and the other lead on the other terminal. Do that once for primary and then once for secondary coils. How close does terminal 8 and 10 have to be to 350 ohms? I'm getting 327 ohms. Terminal 7 and 15 measures at 89.5 ohms. |
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Posts in this topic
surfdogskier How to test MPS Oct 14 2019, 06:03 PM
JamesM
A bad MPS shouldn't cause injectors not to fi... Oct 15 2019, 10:28 AM
dr914@autoatlanta.com do not give up! If you send us your control u... Oct 15 2019, 10:37 AM |
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