started out with lose of rps. then she stalled out and after 20 min or so started right back up and got her home. tried to put snap on computer on her to see what was going on and had no communication tried a friends comp and same thing checked all fuses and made sure key was on still nothing. now she has no fuel gauge at all and we know shes at about ahalf tank. she still wont start and still chasing my tail. Please any help would be nice.

 

Be careful when probing pins on the Data Link Connector.

Note - The top row of pins begin with #1 from the left, and end with #8 on the right. The bottom row begin with #9 from the left, and end with #16 on the right.

Verify that you have B+ (battery voltage) to pin #16 of the DLC (Data Link Connector - OBDII port). This terminal should be powered at ALL times.
Also verify that the cigar lighter doesn't work.

Verify ground at body ground pin #4 and sensor ground pin #5 also.

Check resistance between pins 6 and 14 on the DLC with the key off. Should be 0, 60, or 120 ohms. Everything is OK if it is 60 ohms.
Pins 6 and 14 are the CAN bus (+) and (-). Pin 6 is the CAN serial data high line

Verify 5 volts at pin #10.

Also Verify 3.5 volts at pin #7 (ISO bus).

Check for v-reference short by unplugging the two wire sensors and testing:
EOT, ECT, IAT1 (MAT at the MAF, IAT2, TFT, WIF sensor. Also the ambient air temp and cab air temp through the HEC).

Check for v-reference short by unplugging the three wire sensors and testing:
Fan speed sensor (in fan clutch connector wiring), APP, EGR valve, ICP, EBP, MAP, BARO, TPS sensors, vehicle speed sensor.

 

have an open cam bus reading is the only thing i cam find

 

need to know what is on cam bus

 

Did you try the things I posted?

 

yes tested all the pins and 6 and 14 over 120 and 7 is reading 1.5 pin 10 is reading about 3 volts