About the Hitachi MAF sensor. --->

VonK :: Retired · 04-04-2003, 08:22 PM

First you need a "tamper resistant" torx driver #20. That's the one with the whole in the bottom.

Taking the sensor assembly out reveals that it is, not surprisingly, a hot wire anemometer. The wire is replaced by more modern thermistors that are much more rugged than mere resistance wire. But it's the same principle.

This is looking at the sensor in the direction of the air flow.

A closer look at the working parts shows one thermistor (green arrow) exposed to the free flow of air. It is probably the Air Intake Temperature Sensor. In the cavity two more thermistors can be seen. After passing those thermistors, the air is channeled to the right through a duct that is open to the intake flow but at right angles to it. This duct probably controls reverse flow at low RPMs.

Finally, a look at the back of the sensor looking upstream against the flow.

This sensor appears to operate by a type of Wheatstone bridge circuit that's contained in the small cover space.

Happy Motoring.

BUFFALONOGAROpebFATS · 04-04-2003, 08:30 PM

Hal_TT::CBP · 04-05-2003, 05:47 AM

Took mine out way back but didn't physically remove the sensors from the MAF assy to look at them.

VonK :: Retired · 04-05-2003, 07:01 AM

VonK :: Retired · 04-05-2003, 07:07 AM

Now I hope it'll work after I put it back. "If it ain't broke, don't fix it." :-)

BUFFALONOGAROpebFATS · 04-05-2003, 08:00 AM

04-04-2003, 08:22 PM	#1
VonK :: Retired Member Account #: 12010 Join Date: Nov 2000 Posts: 4,222	About the Hitachi MAF sensor. ---> First you need a "tamper resistant" torx driver #20. That's the one with the whole in the bottom. Taking the sensor assembly out reveals that it is, not surprisingly, a hot wire anemometer. The wire is replaced by more modern thermistors that are much more rugged than mere resistance wire. But it's the same principle. This is looking at the sensor in the direction of the air flow. A closer look at the working parts shows one thermistor (green arrow) exposed to the free flow of air. It is probably the Air Intake Temperature Sensor. In the cavity two more thermistors can be seen. After passing those thermistors, the air is channeled to the right through a duct that is open to the intake flow but at right angles to it. This duct probably controls reverse flow at low RPMs. Finally, a look at the back of the sensor looking upstream against the flow. This sensor appears to operate by a type of Wheatstone bridge circuit that's contained in the small cover space. Happy Motoring. __________________ VonK *"Not dead yet...!"* (Monty Python) *"A little bit of knowledge is a dangerous thing."* (unknown) vonk at bayarea dot net All statements, quotations and illustrations by VonK are to be construed as his opinions only, and not as advice, consent, recommendation, guidance, instruction, and/or suggestion.

04-05-2003, 05:47 AM	#3
Hal_TT::CBP Senior Member Account #: 3027 Join Date: Mar 2000 Posts: 9,679	Thx for the detailed pics =-) Took mine out way back but didn't physically remove the sensors from the MAF assy to look at them. __________________ Hal. Whoops... I wanna ride... APR Stg3 (and then some) Sold.

04-05-2003, 07:01 AM	#4
VonK :: Retired Member Account #: 12010 Join Date: Nov 2000 Posts: 4,222	Wh...wh...wh...what's chi...chi...chi...chibba? ;-) __________________ VonK *"Not dead yet...!"* (Monty Python) *"A little bit of knowledge is a dangerous thing."* (unknown) vonk at bayarea dot net All statements, quotations and illustrations by VonK are to be construed as his opinions only, and not as advice, consent, recommendation, guidance, instruction, and/or suggestion.

04-05-2003, 07:07 AM	#5
VonK :: Retired Member Account #: 12010 Join Date: Nov 2000 Posts: 4,222	No problem. ---> Now I hope it'll work after I put it back. "If it ain't broke, don't fix it." :-) __________________ VonK *"Not dead yet...!"* (Monty Python) *"A little bit of knowledge is a dangerous thing."* (unknown) vonk at bayarea dot net All statements, quotations and illustrations by VonK are to be construed as his opinions only, and not as advice, consent, recommendation, guidance, instruction, and/or suggestion.

04-05-2003, 08:00 AM	#6
BUFFALONOGAROpebFATS Member Account #: 33161 Join Date: Feb 2002 Posts: 3,304	LOLLOLLOL __________________ CNPE founding member

04-04-2003, 08:30 PM	#2
BUFFALONOGAROpebFATS Member Account #: 33161 Join Date: Feb 2002 Posts: 3,304	there is no way someone with your knowledge ever drinks or smokes chibba for sure. VONK=IQ+100 __________________ CNPE founding member

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