The splices should be up the wire from there under a wrapped-up section

A lot of them are above the fuel rail as the wire bundle runs back

Mine were pristine and clean but saw a pic of someone's that was not

But since you have a signal ( Green / Yellow wire ) coming out of an alive MAF sensor at 3 volts but no signal seen at the ECU I would look at the ECU connector socket Red 4

This signal return wire does not have a splice

 

Ok thats next, just confirmed I have same voltage up top

 

Something I remember from Vee was his suggestion of giving the pins / blades on the MAF connection a bit of a twist to get them to better connect with the sockets

You have the same blade type of pins on the ECU connector and on the sockets side there are 2 pinching tabs that some of the tabs can be missing

 

"But since you have a signal ( Green / Yellow wire ) coming out of an alive MAF sensor at 3 volts but no signal seen at the ECU I would look at the ECU connector socket Red 4"

Is this on passenger sidewall or under passenger dash?

 

It will always be fwd of the right front door hinge under a small cover

Look for a dedicated case ground wire

This pic is from a right hand steering model

 

Ok I've got it out, The pins on the module look fine, Is there a way to test the unit?? They sure don't give any slack on the cable to check the female side, If I paperclip the socket and the socket at the MAF should a continuity check suffice?

 

Leaving alone the ground wire of the 3 wires in the MAF circuit..........

Use as small of a paper clip to not spring apart the sockets

ECU connector : Red 4 to Black 24

MAF connector : Green / Pink to Black / Light Green

The Pink / Slate wire in your pic is the ground wire in the 3 wire circuit , colors change a bit with aging

Water can get into the ECU connectors as the wire goes into the connector , they have a rubber seal on each wire , but water can climg to the wires coming down from above and pass through the seals and effect the crimp between the socket and the wire , give the wire a slight tug

These individual wire seals where missing on mine

..

 

unplugged maf hesitates off idle it will run in fake speed density mode. eventually trans light comes on

 

"ECU connector : Red 4 to Black 24"

Are you saying I should jumper these two to check for continuity ??

 

Unplug the ECU connectors and jumper the Red 4 to Black 24

With your meter on the MAF connector sockets with the wire colors Green / Pink and BlacK / Light Green check for resistance and should be close to 0

 

Going to be a few days to post results, We're right in the center of this atmospheric river hitting california

 

Ok, I'm assuming this was supposed to be with key off.

"Unplug the ECU connectors and jumper the Red 4 to Black 24

With your meter on the MAF connector sockets with the wire colors Green / Pink and BlacK / Light Green check for resistance and should be close to 0 "

Black to Green = 0.00
Black to Pink = 0L
Green to Pink = 0L

 

I also noticed the pink wire is actually at Red 32

 

Also , Now I never claimed to be a R & E, The manual I have show Black 24 & Red 17 both labeled BLG, Is there a test I should do with them?

 

I was the R & E with the 4 color markers in his pocket on the flight line between flights

We only had 1 / 747 flight though our hub going to Hawaii nonstop

The pic you have is looking down into the ECU connectors on the ECU side so it is a mirror image of the chart I made of the wire side half with the wonderful colors

My pic is also of the connector face and not the wire protruding

looking down into the ECU connector it won't be powered up so there is nothing to look at except the condition of the pins / blades

the Red 4 ( PI05 -4 ) pin will be receiving the 1.2 volts DC at idle as the MAF return signal

The Black 24 will be receiving B + raw power from the ECU controlled relay into the ECU , so it is just a test point using the Black / Light Green wire

Normally the other engine sensors are feed by the ECU a precise 5.0 volt DC reference power from the ECU but not in the MAF case

But it does provide a meter test path in that you're looking at the integrity of the Green / Pink MAF return wire at Red 4

Ask questions

 

Ok I'm still confused, On the diagram with the red line you highlighted circuits BLG, I was assuming I was jumping those 2 circuits , I jumped red 4 to black 24 & check resistance at the MAF, But according to the diagram I up loaded the BLG circuit is actually red 17 & black 24, What am missing ? Thank you

 

Still Thinking??

 

Was working on someone's car , be back shortly

 

Just a update, I went ahead and sent the ECM out to be checked and repaired.

 

oooh, where? What did they say they can do?