Question about 1989 Honda Civic

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Fuel pump does not initialize at start position

It appears that the fuel pump relay is working properly. I am able to direct wire the yellow w/black stripe wire coming out of the firewall in engine compartment and it initializes the fuel pump and engine will star. I then disconnect the jumper wire and engine continues to run properly. Where in the heck is the main relay? I've searched behind the fuse box but cannot find it ( thinking it may be the problem ) ? Any help is welcomed....Jake

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  • Hdwalldoc Jul 08, 2008

    OOPS it is a 1989 Honda Civic LX

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On your car the main relay should be behind the fuse box inside under the dash. You might have to unbolt the fusebox to find it but it is a black relay that is about 2-2 1/2" wide. It is very likely that is your problem. The fuse box only has two 10mm nuts holding it in, just be careful to not pull on any wires to hard when trying to remove it. That relay can be a little pricey but it one of the most common failure on the older Hondas like ours. I hope this helps.

Posted on Aug 15, 2008

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1 Answer

Where is the fuel pump fuse located?


There should also be a 15 amp EFI2 fuse next to the two headlights fuses. The 20 amp fuse is the main power supply to the circuit opening relay which controls the fuel pump. If you're 100% certain that the 20 amp fuse has power on both sides with the key in the on position and you do not have power to the black wire with a red line that the fuel pump this means is the circuit opening relay is not functioning or the computer is not energizing or turning on the circuit opening relay. Circuit opening relay is located on the back side of the junction block on the driver side instrument panel. This is where the other fuse box is located. If you reach your hand up onto the back side of this fuse box there is one large gray single wire probably 8 gauge and next to that are three relays that are exactly the same the first relay closest the passenger side of the circuit opening relay does a click when you turn the key to the start position? As a test you could swap that relay with the one next to it and see if the car starts or it clicks in the start position. Your other option to rule out whether not you also are dealing with the fuel pump problem is to run a jumper wire with 12 V directly to the black wire with a red tracer. You would need to tap into this wire with the connector plug-in otherwise you will also have removed the ground or use a jumper box and just use power on the black wire with a red line and ground on the white wire with a black line pins in the fuel pump bracket.

Apr 04, 2016 | 2006 Toyota Corolla CE

1 Answer

94 s10 fuel pump relay clicking no start


The clicking noise at the relay indicates that the relay is bad, or that the wires to the relay and/or connector is bad.

A relay is an electronically activated switch. Inside is a coil. When 12v+ is applied to one end of the coil, and a ground is applied to the other end, the coil gets charged, creating a magnetic field. This magnetic field literally moves a metal lever from position A to position B. One end of the lever is attached to constant battery power. When coil not energized, the lever rests in postion A (which in the case of the fuel pump relay is feeding the battery power to an unused terminal). When the coil is activated, the lever moves to position B (which in this case is a terminal connected to your fuel pump wire). Thus, when the relay is activated, 12v+ is being directed from the battery to the fuel pump.

This fast clicking indicates that the relay coil is not getting a constant voltage or ground supplied to it, thus the lever is moving back and forth between position A and position B, either there is a wiring issue, a connector issue, or an internal issue with the relay.
The relay has 4 wires, black, grey, orange, green with white stripe.
black = ground
orange = battery = 12v+ always
grey = wire out to fuel pump (on some cars this wire is tan with white stripe)
green/white = signal wire from ECM

When key is turned ON, the ECM sends 12v+ out on the green/white wire to the relay for about 2 seconds - this activates the relay coil for 2 seconds, thus running the pump for 2 seconds (priming). When the vehicle is started, the ECM sees a constant ignition signal from the ignition module, and sends a constant 12v+ out on the green/white wire, thus activating the relay coil constantly, and thus running the pump constantly.
When car shut off, no more constant ignition signal, thus ECM stops sending the 12v+ out on the green/white wire.
So, you can kind of test your connector ...
1) remove connector from relay
2) jumper a wire from the slot for the orange wire to the slot for the grey wire - fuel pump should run - wiggle wires to verify at connector
3) probe black wire slot with ohm meter - make sure black wire has constant ground - wiggle wires at connector
test relay ...
1) remove relay from connector
2) rig a ground wire to the tab that had the black wire when in connector
3) apply 12v+ to the tab that had the green/white wire - relay should click once and do this every time you apply the 12v+

That should help you track it down to either a connector problem, a wiring problem, or a relay problem.

Nov 28, 2015 | Cars & Trucks

3 Answers

Where are starter relays located ?


Probably should get a chiltons or hanynes manual, manual will tell you where and probably more for future issues.

May 10, 2014 | 1998 Chevrolet Lumina

1 Answer

Starts and dies right away, intermittent fuel guage


If initial indications sound like a buoy gasoline and extenders and gasoline injection system in the compartments, the problem is in the power feeder wires or in the Bawa-jee or in the combustion chambers of electricity and gasoline. This prevented Mator that it does not appear any kind of Leak of oil and water.
So observed in the case of operating the initial car exhaust fumes if the color was black injection system maintenance problem but if the sky was the color of this is evidence that the oil spill to the combustion chambers.
4db5eaba-57dd-4e28-a8fb-64a64e8b9983.jpg 351746a9-e081-48bb-a651-721784cf6eed.jpg

Feb 26, 2014 | 2002 GMC Sierra 1500

1 Answer

Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

Jun 24, 2012 | Cars & Trucks

1 Answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

Feb 13, 2011 | 1992 Ford Thunderbird

1 Answer

I have an 87 f150 with wiring problems. ometime it will crank, run a few minutes, and quit. The fuel pump(new) will cut off and the injectors won't work. Any ideas? Email hooverman692003@yahoo.com


Hello Hooverman.

There are quite a few items that are possible causes.
The EEC power relay is probably shutting down for some reason.
This relay, when shut down will turn off power supply to injectors, the fuel pump and a few other items.
This relay is mounted on the top of the left front fender under a plastic cover and has a brown base with a black top. The fuel pump relay is beside it and has a green base with a black top.
The large yellow wire into the power relay should have constant 12 volts positive power.
The white/light blue wire should have 12 volts positive power with key on.
The black wire is ground/negative.
When the key is on the red wire is activated to 12 volts positive.
Verify those circuits and you will find the problem.
Often I have found corroded splices in the yellow feed to the relay. You will need to open the harness out and trace back to find those splices. There are two of them. This corrosion will often cause intermittent connection.
If you need further advise on this problem please ask me in a comment here and I will return to assist you.

Thank you for using FixYa.

KL

Feb 09, 2011 | Ford F-150 Cars & Trucks

1 Answer

What typically is needed to to be done if a 2001 supercrew has had air bags deployed and wont start after that. The switch in the right kicker panel for the fuel pump does not appear to have been tripped....


Good info on the PATS / theft light. Looks to be the PATS / HEC operation is functioning correctly

The Fuel inertia switch only cuts power to the fuel pump, so if tripped, the truck would have a crank no start issue. Do you have a crank no start, or no crank issue.

To reset, just press down on it. To check if the switch is tripped, check for power at the connector to the fuel inertia switch

Engine compartment fuse # 10 ( 20A ) to the fuel pump relay -> Dark Green w/ yellow stripe wire to the fuel inertia switch -> pink w/ black stripe wire to the fuel pump module.
Check the pink w/ black stripe wire to ground with a meter for power, with the key in the run position.

If you turn the key from off to run ( do not start ) you should hear the fuel pump cycle ( hum, then turn off ).

Could be an issue with the fuel pump relay ( my '01 had a crank no start at ~ 35K miles, bad fuel pump relay ). I proved this out ( after a stupid ID10T error in my diagnoses process ) by jumpering the normally open contacts in the fuel pump relay socket, and then installing the trailer tow reverse circuit relay into the fuel pump relay socket ( same full size Ford Relay ).

Jumpering the fuel pump relay in the relay socket ( remove relay and use jumper wire ), red line
sscullys_16.jpg

If you have a no crank issue, could be the DTR ( Digital Transmission Range ) sensor on the driver's side of the trans is out of alignment.

Check the start motor relay ( on the firewall on the passenger side ) for power on the Tan w/ Red stripe wire when the key is in the start position ( this is from the ignition switch through the DTR when in park or neutral to the starter motor relay ).

You can test another route, turn the key to the run position, and apply power to the Tan w/ Red stripe wire on the starter motor relay in the engine compartment on the firewall. BE CAREFUL, the motor should turn over, keep clear of moving parts.

Post back a comment to this problem with the results of the testing.

Thanks

Nov 03, 2010 | 2001 Ford F150 Styleside SuperCrew

3 Answers

My stock honda key turns over the engine, i have spark, no fuel is being delivered to start engine. what could be wrong? is there a fuel flip switch anywhere?


won't claim as a solution but...

Have you verified that fuel is pupming (is the fuel pump working?)

there is a pressure regulator on the end of the fuel rail that is vaccuum activated.... is thier vaccuum getting to it to create pressure for the injectors..

Just s few items to check....

Mar 09, 2010 | 1997 Honda Prelude

1 Answer

93 merc topaz feul pump wiring harness question


The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

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