2004 3.7 Dakota, No bus no crank
 

The truck randomly shut off as I was driving.

- No gauges work
- No bus on odometer
- Does not crank
- I've checked all fuses and relays, starter cranks if relay is jumped, fuel pump works if relay is jumped, jumping the ASD does nothing.

replaced camshaft postion sensor.
- all grounds on PCM pins get 12v
- unplugged Crank, Cam, MAP, TPS, Oil presure sensors, made no difference.

Cam plug outer pins get 5v, 4.90-5v, middle ground pin gets 12v
I get the same voltages for Crank, TPS sensors.
I could get the MAP sensor off, it looks melted, so i cut the wires, still no bus no crank. MAP wires get 5v, 12v ground, 4.90-5v signal.

12 volts on that ground pin ain't right. Need to find out why.

Problem solved.

PIN 11 FUSED IGNITION SWITCH OUTPUT
PIN 12 FUSED IGNITION SWITCH OUTPUT (OFF-RUN-START)
on PCM C1 plug

both pins should get 12v with key on position, my pin 11 was not getting 12v, so i cut the wire and jumped 12v to it.Truck started and no bus is gone.

Hahaha, or hack the harness and tie it directly to the battery and let the next owner wonder why :D