Robert3916
Member
- Joined
- November 8, 2007
- Messages
- 10
- Reaction score
- 0
- City, State
- Ann Arbor, Michigan
- Year, Model & Trim Level
- 1993
While driving through a construction area, My Explorer quit working. Tested for fuel
pressure with key on, no pressure. (New fuel filter) Removed tank, tested fuel
pump, powers on. Tested lead into fuel pump, 6 volts, not 12. Tested all leads
up to and including Fuel Pump Relay(replaced relay too) still 6 volts not 12. Fuel Pump Relay In, is 12 Volts, but Out to fuel pump is 6 volts. I discussed problem with a Mechanic over the schematics of the system, and that he said that the PCM that has a direct connection to the Fuel Pump Relay out connection may be causing a load to drop the voltage down to 6 volts.
Is there another component in system causing the PCM on another connection, to cause a load on the connection from the PCM to the Fuel Pump Relay to be 6 volt and not 12 volts. How can I test the PCM to see if it
is bad? (I am told scan tools will not catch this problem sense no check engine light is on. Not an emission problem?)
Thanks Robert3916
pressure with key on, no pressure. (New fuel filter) Removed tank, tested fuel
pump, powers on. Tested lead into fuel pump, 6 volts, not 12. Tested all leads
up to and including Fuel Pump Relay(replaced relay too) still 6 volts not 12. Fuel Pump Relay In, is 12 Volts, but Out to fuel pump is 6 volts. I discussed problem with a Mechanic over the schematics of the system, and that he said that the PCM that has a direct connection to the Fuel Pump Relay out connection may be causing a load to drop the voltage down to 6 volts.
Is there another component in system causing the PCM on another connection, to cause a load on the connection from the PCM to the Fuel Pump Relay to be 6 volt and not 12 volts. How can I test the PCM to see if it
is bad? (I am told scan tools will not catch this problem sense no check engine light is on. Not an emission problem?)
Thanks Robert3916