L24/28e Fuel Injection Special Tool MST4802

General information about the first-generation Nissan Maxima in the US. What was the Datsun 810 became the luxury leader Maxima in the US in 1981.

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asavage
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L24/28e Fuel Injection Special Tool MST4802

#1

Post by asavage » 12 years ago

On a whim, I picked this up at the Portland Auto Swap Meet earlier this month.

By Miller Tools, Nissan Electronic Fuel Injection Analyser, MST4802. It can be used to test the fuel injection wiring harness and most of the sensors, as well as the electrical operation of the Ign. switch and fuel pump. It won't test the ECU, and it also won't work for the turbo versions of the 280Z(X), so the manual says. It won't run the car without the OEM ECU like Kassim's apparently will; this unit just checks the sensors and harness. The price was right though.

(click on any image for larger)
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I've scanned the 20-page manual and have it online here.

Don't know what the heck I'll do with this thing, I don't think I'm in the market for a gasser Gen1 Maxima or 280Z.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.

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kassim503
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#2

Post by kassim503 » 12 years ago

After blowing thru the manual, I noticed it has something to read air temperature. I does the L-jetronic measure air temperature? I didnt think they had a air temp sensor, if it does I have reason to believe mine is broken, or disconnected.
'83 maxima sedan, l24e, a/t, black

227K SOLD 6/7/2012

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asavage
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#3

Post by asavage » 12 years ago

Yup, 1982 FSM page EF-14 shows an air temperature input.

Page EF-17 says the idle bypass port in the AFM contains an air temp sensor. In the picture, physically it looks like it's contained as part of the back of the flapper position sensor.

Page EF-18 has two paragraphs describing its operation.

Page EF-29 has Air Temperature Sensor tests on a full page. Instead of a temperature/resistance graph, they give a mere two test condition chart.

My guess is that this iteration of the L-Jetronic system does not lean too heavily on the air charge temperature input.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.

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kassim503
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Location: Stony Brook, NY

#4

Post by kassim503 » 12 years ago

Yep, it most certianly does, but when I connected my efi tester onto the harness, it has no reading for the air temperature. Ill look into it next week, it appears to be running fine without it- its been like this for years
'83 maxima sedan, l24e, a/t, black

227K SOLD 6/7/2012

davehoos
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#5

Post by davehoos » 12 years ago

air temp is part of the AFM.ive often seen it replaced seporatly as with the bosch afm.

not working it would be rich or lean depending on ECU default setting.
cant help with spec but i guess it is rich.

common thing now is to fit a set resistance value to give cold air setting.
this gives you 100HP extra while improoving fuel economy.
WCJR31 Skyline.3.0 manual.wagon
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LPG Ford Falcon 99-06 93 Disco
Local Shire Southern Zone Mechanic.

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asavage
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#6

Post by asavage » 12 years ago

davehoos wrote:common thing now is to fit a set resistance value to give cold air setting.
this gives you 100HP extra while improoving fuel economy.
That must be a typo. Changing a A/F ratio setting on a 150 HP engine is not going to make a 75% difference to the better, not a chance.

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kassim503
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#7

Post by kassim503 » 12 years ago

Yeah, running a bit richer than stock may pick up a few hp, like 5, 10 tops.

My efi tester also has a manual control over the feedback sensors, so I could just set it to the appropriate temp, see if it makes a difference
'83 maxima sedan, l24e, a/t, black

227K SOLD 6/7/2012

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