Z32 maf issues with s14 ka24det - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Schoelkopf94 · 02-25-2020, 06:56 PM

Hey guys,
I just finished my kat build and I am stumped. I am running at 11 afr up to 12 when reved.

Jwt ecu tuned for z32 maf and 370cc injectors

My maf has 10-12 volts on all three wires. I checked the wiring about 13 times now. Everything checks out according to jwts guide. I also bought a brand new maf and the voltages are the same.
No continuity across the maf terminals except the two grounds. Nothing looks burnt on the inside. I also opened the ecu and didn't see anything burnt.

I can not figure out what is happening. Pls help. Can I check the ecu in a different way? Does anyone know how to check the maf outside of the car and what the resistances should be across the terminals?

anthony_240 · 02-26-2020, 04:11 PM

Do you have a link to how jwt wants you to set it up? When you disconnect the MaF, do you still have 12v at the wires?

Sent from my iPhone using Tapatalk

Schoelkopf94 · 02-28-2020, 09:11 AM

No I don't. I followed JWTs guide for the maf wiring but the ecu was purchased used. I called jwt and talked with a tech and he believes there is an issue with my harness. I will be looking into that tomorrow

Schoelkopf94 · 02-28-2020, 09:14 AM

Also, no when the maf is unplugged I only get 12v on the proper wire. I will also be bench testing my mafs because that fact alone tells me the maf is bad, just hard to believe two behave exactly the same.

S14rebuild · 03-01-2020, 07:18 AM

If u have on 1 wire with 12v going in....and its pluged into the maf and now 3 wires have 12v comen out..maf is shot.

Schoelkopf94 · 03-01-2020, 07:39 AM

After testing continuity in the harness and bench testing both of my mafs, I've decided to buy another maf. Harness was good but both mafs showed incorrect resistances across the signal terminal and power terminal. Hope that was all it was.

02-25-2020, 06:56 PM	#1
Schoelkopf94 Join Date: Feb 2017 Location: Indiana Age: 27 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	Z32 maf issues with s14 ka24det Hey guys, I just finished my kat build and I am stumped. I am running at 11 afr up to 12 when reved. Jwt ecu tuned for z32 maf and 370cc injectors My maf has 10-12 volts on all three wires. I checked the wiring about 13 times now. Everything checks out according to jwts guide. I also bought a brand new maf and the voltages are the same. No continuity across the maf terminals except the two grounds. Nothing looks burnt on the inside. I also opened the ecu and didn't see anything burnt. I can not figure out what is happening. Pls help. Can I check the ecu in a different way? Does anyone know how to check the maf outside of the car and what the resistances should be across the terminals?

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02-26-2020, 04:11 PM	#2
anthony_240 Zilvia Junkie Join Date: Nov 2016 Location: Los Angeles Age: 30 Posts: 489 Trader Rating: (3) Feedback Score: 3 reviews	Do you have a link to how jwt wants you to set it up? When you disconnect the MaF, do you still have 12v at the wires? Sent from my iPhone using Tapatalk

02-28-2020, 09:11 AM	#3
Schoelkopf94 Join Date: Feb 2017 Location: Indiana Age: 27 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	No I don't. I followed JWTs guide for the maf wiring but the ecu was purchased used. I called jwt and talked with a tech and he believes there is an issue with my harness. I will be looking into that tomorrow

02-28-2020, 09:14 AM	#4
Schoelkopf94 Join Date: Feb 2017 Location: Indiana Age: 27 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	Also, no when the maf is unplugged I only get 12v on the proper wire. I will also be bench testing my mafs because that fact alone tells me the maf is bad, just hard to believe two behave exactly the same.

03-01-2020, 07:18 AM	#5
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	If u have on 1 wire with 12v going in....and its pluged into the maf and now 3 wires have 12v comen out..maf is shot.

03-01-2020, 07:39 AM	#6
Schoelkopf94 Join Date: Feb 2017 Location: Indiana Age: 27 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	After testing continuity in the harness and bench testing both of my mafs, I've decided to buy another maf. Harness was good but both mafs showed incorrect resistances across the signal terminal and power terminal. Hope that was all it was.