1994 VX LAF Heater Voltage - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 03-18-2012, 09:12 PM   #1
Registered Member
 
Join Date: Mar 2012
Posts: 3
Country: United States
1994 VX LAF Heater Voltage

I was checking my LAF heater voltage.
I disconnected the LAF sensor.
I used a voltmeter to check the volatge between the yellow/black and black wires in the connector coming from the car.
My manual says it should have battery voltage with the ignition key in the on position.
I only have 6.2v
The black ground wire tested fine. If I connect the red lead of the voltmeter to the positive side of the battery, I can get 12 volts with the black lead still in the connector, connected to the black ground. G101 on the thermostat housing is also fine.

I'm wondering if the manual is written wrong since the power for the LAF heater is coming from the ECU pin A6. I don't see how the voltage could be stepped up. The manual references apprx 7 volts if you test the yellow/black to chassis ground, then battery voltage if you switch to yellow/black and black on the connector. I really don't understand how the voltage would change??????

Could someone please check the voltage between the yellow/black and black wires for the LAF heater on a D15Z1?

Thanks,
jlane
__________________

jlane is offline   Reply With Quote
Old 03-18-2012, 09:13 PM   #2
Registered Member
 
Join Date: Mar 2012
Posts: 3
Country: United States
Re: 1994 VX LAF Heater Voltage

Quote:
Originally Posted by jlane View Post
I was checking my LAF heater voltage.
I disconnected the LAF sensor.
I used a voltmeter to check the volatge between the yellow/black and black wires in the connector coming from the car.
My manual says it should have battery voltage with the ignition key in the on position.
I only have 6.2v
The black ground wire tested fine. If I connect the red lead of the voltmeter to the positive side of the battery, I can get 12 volts with the black lead still in the connector, connected to the black ground. G101 on the thermostat housing is also fine.

I'm wondering if the manual is written wrong since the power for the LAF heater is coming from the ECU pin A6. I don't see how the voltage could be stepped up. The manual references apprx 7 volts if you test the yellow/black to chassis ground, then battery voltage if you switch to yellow/black and black on the connector. I really don't understand how the voltage would change??????

Could someone please check the voltage between the yellow/black and black wires for the LAF heater on a D15Z1?

Thanks,
jlane
......
__________________

jlane is offline   Reply With Quote
Old 04-12-2012, 06:58 AM   #3
Registered Member
 
kamesama980's Avatar
 
Join Date: Nov 2007
Posts: 742
Country: United States
Location: Columbus, IN, USA
Send a message via AIM to kamesama980 Send a message via Yahoo to kamesama980
Re: 1994 VX LAF Heater Voltage

What you're describing is kind of hard to follow without the manual to compare to but it sounds like you've got excessive resistance on the +12v wire to the heater. I don't know for sure about the difference in voltage to ground but the way honda wired widebands, anythings possible. I'd tend to go with the manual unless I had a good reason to diverge.
__________________
-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
kamesama980 is offline   Reply With Quote
Old 05-12-2013, 02:28 PM   #4
Registered Member
 
Join Date: May 2013
Posts: 15
Country: United States
Just Checked my 92 VX

7.28 Volts....Across the Yellow & Black
7.28 Volts ...Across the Yellow & Ground
00000 Volts Across the Black & Ground

Coconut
Coconut Sunrise is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
This......Is Flying! shatto General Discussion (Off-Topic) 3 09-30-2011 08:59 PM
ScanGauge II info, tips, and tricks theholycow Hypermiling 1 01-07-2009 11:48 AM
Cam advance - increased FE? Rower4VT General Fuel Topics 6 02-09-2008 01:49 PM
Is there a OBDI or OBDII conversion for older vehicles? kozaz General Fuel Topics 3 11-13-2007 08:32 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 05:40 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.