As mentioned in my earlier post on the diode pack I'm having a problem keeping the engine running unless I jumper pins 1 and 5 of the diode pack to get voltage to the fuel pump relay. I am not getting voltage to Pin 2 of the diode pack. It appears to be supplied by the air flow meter on KU. I may be mistaken. If I don't jumper pins 1 and 5 the engine will start and run for about 3 to 5 seconds and then quit so it appears I am getting voltage on pin 3 to initially to supply voltage to pump, cold start relay and thrmo time switch. I have installed new diodes and resistor.

Anyone have any suggestions?

Submitted by aljaszcar@emba… on Wed, 02/09/2011 - 11:57

Well gentlemen I finally found the problem with the diode pack. It wasn't the diode pack! The problem was being caused by a mis adusted MAF bypass airflow adjustment. You should have 12 volts on pin 2 of the diode pack once the engine is running. 12 volts is supplied to the air flow meter(MAF) pin NS or 33 via pin 87 of the main relay. The flap in the airflow meter is supposed to open at least 8 degrees causing a switch to close in the air flow meter thus sending 12 volts to pin 2 of the diode pack. Pin 2 supplies 12 volts via a diode to pin 5 which is connect to the fuel pump relay. The bypass airflow adjustment on the air flow meter was misadjusted cause the flap to not open its full 8 degrees at idle. Once I adjusted that everthing fell into place.

Thanks for all the heip.

Submitted by dougdwyer1@com… on Sun, 02/06/2011 - 20:37

Sounds like the switch inside the air meter that supplies the KU wire isn't closing.

Or....the switch isn't being supplied key-on voltage on the brown/slate wire from the main relay. I'd check this first and then, if needed, open up the AFM for a look-see at the switch

Cheers
DD