MAF Sensor Help Needed.

[Jim S.]

My 78 2FE 40 shares a MAF sensor from what I believe is an 89 FJ 62. Model # 2250 - 61010. While trying to unplug the sensor I messed up bad. Removed 2 screws holding the connector to the body and pulled. YIKES!! Is there some way I can access the body and repair this. Secondly can someone explain how that plug comes apart .
Thanks, Jim

 

[3_puppies]

there is a metal spring clip that holds the plug to the socket
on either side use a small pick to remove spring clip

can't help on the other, maybe remove phillips screws and take apart

 

[Jim S.]

there is a metal spring clip that holds the plug to the socket
on either side use a small pick to remove spring clip

can't help on the other, maybe remove phillips screws and take apart

Thank you. Very much appreciated.

 

[Engineer8000]

The black plastic top is held on with a bead of sealer; you will need to remove that to access the circuit board. You are not the first to do this. This is someone's (not me) repair of a similar unit.

 

[rlong]

That’s pretty high on the, “That Sucks” scale! I’m sure it will be just fine!

 

[Jim S.]

The black plastic top is held on with a bead of sealer; you will need to remove that to access the circuit board. You are not the first to do this. This is someone's (not me) repair of a similar unit.

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View attachment 4213342

I can do this! Thank you.

 

[Engineer8000]

I would run the fsm test on it before putting the top back on.

 

[Jim S.]

I would run the fsm test on it before putting the top back on.

View attachment 4213626

View attachment 4213627

I have noted the colors of each wire in the plug. Need to make sure each one is going to its respective pin. The photo you posted helps. If I find a wire diagram of the ECU would I be able to trace them back to the sensor? Your assistance is greatly appreciated.

 

[Engineer8000]

should be able to, yes

 

[Engineer8000]

I have this one for 88 FJ62. Credit to @Cruiser Cult for posting this on their website.

 

[Living in the Past]

I show 22250-61010 as the part number 8/87-1/90 in the US market.

Curious does the fuel pump have a circuit going threw MAF? On the FJ62 three is a relay that powers the fuel pump while starting. When running there is a safety that breaks the circuit if the engine stops running. Believe it detects air flow in the MAF. Found this out years ago when I was trying to diagnose fuel pump with just the key on.

 

[Engineer8000]

Yes, you remember correctly. The switch between terminals 6 and 7 in the MAF works with the circuit opening relay to do just that. You can test your fuel pump and COR by turning the key on and pushing the MAF flap off the stop.

 

[Jim S.]

I soldered the 3 contacts to the circuit board. When running the tests that engineer8000 posted I discovered one of the very fine wires on the potentiometer
conductor was disconnected. Will attempt to repair it today. If I'm successful will probably use RTV to seal the cap back on.

 

[Jim S.]

I soldered the 3 contacts to the circuit board. When running the tests that engineer8000 posted I discovered one of the very fine wires on the potentiometer
conductor was disconnected. Will attempt to repair it today. If I'm successful will probably use RTV to seal the cap back on.

Turns out that while soldering, I put a little too much heat to the E2 conductor and burned through to the backing plate creating a short. The search is on for a replacement AFM. Years 98 - 91 should work.

A special shout out to Engineer8000!! The schematics and advice were much appreciated.