AndrewFrias

Just jumped in the truck, no AC again, no OD, im thinking im testing this alternatir wrong... Or i grounded out the alt. Ehen i was testing it which caused everuthing to work properly... For a few minutes. Just through the fluke on it and VAC was fluctuating between .050 and .057. I'm ground the on the fluke at the battery and put in the positive lead on the black wire that's leading to the alternator is this correct?

Weird, i have fluctuating vac at the alt. And battery ground... 0.040 to 0.050 up n down n up n down... Also, AC IS BACK, haven't driven it yet however, im thinking that the bottom bolt of the alt wasnt solid, causing a terrible ground, and power flying throughout the circut!!! What the heck! Seems like AC noise was confusing the PCM, could this be from the loose bolt? if my vac is fluctuating is that bad? I gotta pull some cattle from Hamakua side to Hilo, wanna do it sunday!!!

So, every darn Auto Store had a different AC reading on my alt. FOUND A FLUKE AT WORK, gonna check it out!

Smokes, thats the main ground! Perhaps I should try this....

So, took the same Alternator to an alternator shop and they said the ripple is .1 and .0... The dude at the Alt. shop sed the alternator is CHERRY. He also said that the tester at NAPA adds to the VAC, therefore increasing the NAPA reading to .9. He also added that there were no bad diodes....

So 0.9 vac is ok? I took it to oreillys after and they came up with Ripple... .39 damn. Cant believe how difficult this electric stuff is.

Guys, took my alternator in to Napa, AC was 0.9 but their tester said it was good!!!! WHAT GIVES? is that even possible? 0.9!? Guys, took my alternator in to Napa, AC was 0.9 but their tester said it was good!!!! WHAT GIVES? is that even possible? 0.9!?

5. Check for poor connection/terminal contact at APPS harness connector. Repair as necessary. Ensure APPS connector is still disconnected. Start engine. Using a DVOM, measure voltage between cylinder block (ground) and terminal No. 3 (Light Blue/Black wire) on APPS connector. If the voltage is greater than 5.5 volts, go to next step. If the voltage is 5.5 volts or less, go to step 8. Voltage is at like 0 on the connector at this wire, i stuck a paper clip in to try and pull the voltage up, and the truck began to rev... i will attach a picture of the scanner

Gonna take on that diagnostic in the morning. Meanwhile, pulled the codes with my scanner, it sed no engine dtcs however, it did say Transmission DTC present P0123.... So what computer is this pulling from!? The key trick says the same thing

Yep, nothing. To be quite honest, the 4th gear hunting was occuring until I died out and never got it back. Is it possible that the APPS just needs to be changed? I donʻt suppose I have dead pedal, the truck is rather smooth throughout acceleration, and it doesnʻt ever hiccup, it just wont shift into OD now...

gonna go through the P0123 code diagnostic... Damnit, wish there was a plug and play fix...

Nothing really, checked the grounds, wire brushed the terminals and ground areas, and cleared them... some dielectric grease to suppress any noise, and cleared the codes...

So, went for a short drive, and only the P0123 code comes up on the dash....and I still have no OD.... Im thinking APPS? Otherwise everything feels smooth and tight!!!!

UPDATE: -Tried to check for AC noise, but apparently I do not have the correct DVM to do so. Both batteries are steady 12.7 12.8 cold, and get in the 14ʻs, whilst truck is running. Now down to the nitty gritty. Pulled codes and a **** load came up... Key trick produces: P1693-Companion DTC from ECM and PCM P0123-High Input at TPS Scanner pulled these: P1689-No Communication between ECM and IP P0122-Low input at the TPS P1698-CCD from TCM P0122(AGAIN)- Low input at the TPS Damnnnnnn!!!! Where do I start? Should I ERASE the codes and try to drive the truck? This is the first time I have done something to this extent... Im pretty versed in mechanics, however, this electric stuff blows my mind. Thanks guys!