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Electrical troubleshoot is one of the hardest things for people to grasp think of it like Flowing water flowing from point A to B back to A
I suck at explaining so if your unsure you better off to ask or you will fry Computers/sensors etc.... if hooked up wrong and you send power down a circuit
Do NOT unhook Both ends for ohm test
you will only test Pins 18 and 22 at the Same Connector at pcm driver battery with harness plugged in at the trans were going to flow power thru the Wires and the sensor back to PCM Plug
not from PCM to Trans
Ohm test will send a small amount power thru the circuit and measure return volts from that is will calculate resistence
The biggest thing is take your time. If you run into something
you don't understand just ask. Someone will have an answer.
Electrical troubleshooting is a very complex skill. Some times
something will just click and from there out you will find it less
of a hassle to work on the wiring.
Ok, so I just tried to ohm test from the pcm harness 18 to 22 and got nothing, but according to the dIngram, 18 is in unused and doesn't appear to have a wire in the plug. So then I put a lead in the 26 pin which shows to be the tft sensor pin and tried every other pin and still got nothing. I think I'm going to go drain my drain pan at the store and drop the transmission pan and test there. If I know the signal is getting there via my test yesterday of shooting voltage down the harness, but it's not returning, as evidenced in my ohm test this morning, this may be my culprit.
Please let me know if I'm on the right track or just plain dumb at this point. Thanks guys
Now that I have the digital scan tool, the dash gauge will slowly climb to normal temp then stop below the gauges. Scanner shows Temps starting at 38f with 90+f ambient air Temps, and going up to around 88f before bottoming out. It will drop from 88 to 18, and then move erratically up and down from there. I have a hard time believing any of these Temps are accurate.
Ok, so I just tried to ohm test from the pcm harness 18 to 22 and got nothing, but according to the dIngram, 18 is in unused and doesn't appear to have a wire in the plug. So then I put a lead in the 26 pin which shows to be the tft sensor pin and tried every other pin and still got nothing. I think I'm going to go drain my drain pan at the store and drop the transmission pan and test there. If I know the signal is getting there via my test yesterday of shooting voltage down the harness, but it's not returning, as evidenced in my ohm test this morning, this may be my culprit.
Please let me know if I'm on the right track or just plain dumb at this point. Thanks guys
The pin numbers the Pinpoint test refers to are at the transmission bulkhead connector down at trans
The Picture of the plug diagram is at the PCM location by battery
pin number changes per location tested cause they used different plug at each end
you were correct to swap 18 for 26 FYI
22 swaps to 30 at the pcm end
need a Diagram of the Transmission bulkhead connector at Trans
Electrical troubleshoot is one of the hardest things for people to grasp think of it like Flowing water flowing from point A to B back to A
I suck at explaining so
Blade - dude. I've seen your many posts. Now I *suppose* it's possible that you suck at other things (we all do, lol - don't ask me to perform open heart surgery on you as it could end badly...), but explaining is NOT one of them.
Don't sell yourself short. The support you provide to people on a continuing basis is truly remarkable and one of the many reasons I love FTE.
Hi Ed, I see you made it.
I called Ed to ask what he was thinking on this.
I didn't know if you wanted that publicized, Sean.
Yup, Sean called me and explained what all was going on. In case other's reading this don't know, Sean is top shelf people. He just cares about his fellow man. I'd be happy to have a beer with him anytime.
Hang in there, Marine! You're in good hands with these guys.
Man I feel like a *******. I just found the step by step instructions pdf. Apparently I missed it when I downloaded them all. I've got some testing to do here it seems. Back in a few. Thanks for the continued support guys.
Test wires going back to PCM
KOEO Measure voltage at Pin 18 and 22
since we don't have that plug diagram on that end you may need to Find the Correct color code of the wire
OG/BK 18
OG/WT 22
or it maybe labeled on the plug
This is to test things back to PCM and also the PCM itself and the Wires leading UPTO the plug at trans
It gives a Direction to go External wire/PCM or Internal wires/Sensor itself
Internal harness Check is after this one if it passes
Test wires going back to PCM
KOEO Measure voltage at Pin 18 and 22
since we don't have that plug diagram on that end you may need to Find the Correct color code of the wire
OG/BK 18
OG/WT 22
This is to test things back to PCM and also the PCM itself and the Wires leading UPTO the plug at trans
It gives a Direction to go External wire/PCM or Internal wires/Sensor itself
Internal harness Check is after this one if it passes
This is the one I have. At my transmission side, the orange black wire is at pin 18 and orange white is at 22 like you said. I'm getting 191 milli volts there, not the 4.5 to 5v the instructions suggest I should have
