1995 Honda Passport
Problem for Honda 1995 Passport

Fuel pump will not come




By tuffyareus on Oct 28, 2009

" "
Fuel pump will not come on. I have power at the relay but no control power to turn the relay on. I jumpered the contacts and the fuel pump fires right up.
Comments:

Oct 28, 2009

- I have replaced the relay with another one. The schematic says control power comes from the ecm module.

Oct 28, 2009

- Is there anything that the ecm needs to see happen before it will turn on the fuel pump?

Oct 28, 2009

- What else does the ecm control?

Oct 28, 2009

- I would like to know what tells the ecm to turn on the fuel pump relay.

Solution #1

posted on Oct 28, 2009
Somewhat Helpful)

todd0708

Rank: Guru 
Rating: 87%, 89 votes
i think the fuel pressure regulator is the control that you are looking for,it turns the pump on and off as needed to maintain necessary fuel pressure to run the vehicle,it is usually located on the end of the fuel rail where the return line goes back to your tank,but not for sure on this model,hope this helps ,aloha from maui todd0708
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Solution #2

posted on Oct 28, 2009
Somewhat Helpful)

dmftrucker

Rank: Guru  Cars  Expert
Rating: 87%, 419 votes
then its either your ign fuse line,ecm w/o power,or a bad line to the relay control line
Comments:

Oct 28, 2009

- the E.C.M. controls all the functions to make the engine run
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Solution #3

posted on Oct 28, 2009
Somewhat Helpful)

Geekman

Rank: Guru  Cars  Expert
Rating: 85%, 1773 votes
If you powered the fuel pump by bypass the relay, then either the relay is faulty or the wiring to the relay is faulty or there maybe a fuse that is blown.
When the fuel pump relay coil is energizes, the relay contacts will close to supply power to the fuel pump.
Remove the relay then identify the relay coil connectors, then apply 12volts to these connectors, if the relay clicks then the relay is probably OK unless the relay contacts are faulty and then the fault is in the wiring to the relay coil.
Get a service manual wiring diagram and trace the wiring from the relay connector back to the control box/ignition.
You can use a 12v globe or a multi-meter to check the relay coil at the relay connector to see if it energizes
Comments:

Oct 29, 2009

- The ECM is a computer, most commonly known as a engine control module or engine management unit.
This computer with its sensors, controls all the functions of the engine Eg. fuel management, ignition timing etc. This computer or another computer may control the ABS, air bag and other systems.
The computer has a diagnostic connector that the mechanic can connect a diagnostic tool that can download from the computer the fault list which identifies any faulty sensors and electronic components as well as performance data. This allows the mechanic to quickly fix faulty components and make adjustments to optimize engine performance.
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