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Old 01-23-2014, 04:13 AM   #1
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Default Fuel pump circuit

I built and installed a DIYPNP for my friend's 1.6 '90. The fuel pump doesn't start. I built the DIYPNP as instructed:

To successfully gain control over the fuel pump circuit, first you need to be sure you remove the "ST SIG" fuse for the 90 to 93 model Miata. Jumper from "Fuel Pump" on the edge of the main board to "IN" on the high side driver circuit. Jumper from "OUT" of the high side driver circuit to terminal 1C on the connectorboard.

This failed. So, I jumpered FP to gnd in the diagnostic port and the car starts and runs. Do I have to make the circuit for the FP like the vtec circuit in the proto area to eliminate the jumper bandaid?
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Old 01-23-2014, 08:28 AM   #2
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Did you make the connection on the AFM connector. I remember being hung up with this too.
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Old 01-23-2014, 09:04 AM   #3
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Quote:
Originally Posted by Erat View Post
Did you make the connection on the AFM connector. I remember being hung up with this too.
Only if you send the Fuel Pump Ground to 2O...



Quote:
Do I have to make the circuit for the FP like the vtec circuit in the proto area to eliminate the jumper bandaid?
The High Side Driver IS this... If that didn't work, you did something wrong or you failed to remove the fuse before you powered up the ECU and you fried the driver.

It's easier to send the fp ground to 2O and jump the connection to the FP relay through the AFM connector.
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Old 01-23-2014, 04:52 PM   #4
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Thanks Scott,
This ECU was purchased used. I'm just helping him to sort it out. It was partially assembled and I had to go over all the build steps to verify that it was assembled correctly and added what was necessary for his car. So from what I understand, I connect the fuel pump connection on the 1.5B mainboard to 2O



and jumper the AFM connecter like this:

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Fuel pump circuit-v15top.jpg  

Last edited by 99mx5; 01-23-2014 at 09:44 PM. Reason: More detail on build.
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Old 01-23-2014, 05:59 PM   #5
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Old 01-23-2014, 10:23 PM   #6
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We opened up the MS and found that there is no 2O on the adapter board. The connector for 2 only goes up to L.in any event, the factory harness only uses the connectors for 1 and 4. Any suggestions?
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