Make your own free website on Tripod.com
Honda Accord, Civic Main Relay Intermittent Starting Problem: how to fix a stalling or dying car.

Automotive Service Home     Help
Main relay location for all civic models

*Civic relay is located above the dash fuse box.

Civic relay location

Cautions

92-95 CIVIC MR DEMO gif format

85-91 CIVIC MR DEMO gif format

other links::

The unofficial rec.autos.makers.honda FAQ

Contact

Honda's Main Relay Starting Problems & Solutions

Intermittent Starting Problems.

 RELAYmain relay
AccordNumbers of reported
                        width=Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10 FIX 86-89 model yrs
AccordNumbers of reported cases x10Number of reported cases x10  FIX 90-93 model yrs
CivicNumbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10Numbers of reported cases x10  FIX 85-91model yrs
CivicNumber of reported cases x10 FIX 92-95 model yrs
IGNITER Igniter troubleshooting

The main task of the Main Relay is to supply power to the fuel pump and fuel injection system. 

 

Some of the symptoms are:

  • Car won't start when hot outside on fuel injected models.
  • Car does not start after parked for just a minute.
  • Car starts but quickly dies.
  • Windows have been rolled up on a hot day when problem occurred.
  • The heater was on before turning the car off.
  • Tapping your finger or keys on the main relay will start the car.
  • No sounds from the fuel pump in the fuel tank initially.
  • Check engineA "check engine light" will come on for  a bad fuel injection relay. But if the fuel pump relay is bad this light will "not" come on. light comes on or stays on longer than usual or
  • 10-15 of waiting and car pushed to a shade, will start

 

Accord Main Relay REMOVAL

90-93 Accord's relay location/repair procedure:

In this general areaGrey main relay on some vehiclesDark relay for some vehicles

The main relay is located behind the dash on the driver side to the left of the steering column. It is hidden above the silver cruise control box. After removing the cruise control box, you should see the main relay with a gray and rosy colored base.

  1. Remove the cruise control box using a 10 mm socket
  2. Remove the relay
  3. Squeeze in the connector lock and
  4. Unplug the connector from the relay
  5. Installation is the reverse of the procedure, although it isn't require to bolt it back at its original spot. Move the relay to a low, suitable spot where it is cool and away from heat vents.

86-89 Accord's and some Acura Integra relay location/repair procedure:

In this general areaDark relay for some vehiclesGrey main relay on some vehicles

The main relay is located just right above the hood release, inside the dash panel bolted to the left kick panel with a bolt that will fit a 10 mm socket. It has seven wires from the connector.

  1. Remove the coin box (for clearer view)
  2. With a 10 mm socket or wrench
  3. Reach deep inside and at the top of the relay there you will feel a bolt.
  4. Unbolt it.
  5. Bring the relay down and unplug the connector by squeezing the lock flap and separate the connector from the relay.
  6. Installation is the reverse of the procedure, although it isn't require to bolt it back at its original spot. Move the relay to a low, suitable spot where it is cool and away from heat vents.

Civic Main Relay REMOVAL

The 85-95 Civics is also located in the same general area as the Accords. Older Acura Legends is located behind the fuse panel near the firewall.

The color of the relay is usually black with a brown base. The wires coming from it are usually seven. It's above the hood latch release to the right and very high up. Removing it requires removing several parts surrounding it.
In this general areaDark relay for some vehiclesGrey main relay on some vehicles
The relay is made up of two relays, one for the fuel injection system and one for the fuel pump. The relay sits on a PC board inside a plastic case, The PCB board contains resistors and some diodes. The common heat build up is the fuel pump relay, which causes an expansion and contraction of the solder joints thus creating an environment for drying and cracking.

Usually the fuel injection system relay may be the second to fail. If the fuel injection relay fails, a "check engine light" will signal a warning and a code may be sought. The code should point to a fuel injector problem.

There have been reported cases of 88-91 Civics where no sparks have been found due to a bad main relay. It is possible that the ECU plays a part in the ignition system but this is not possible after examining the Civic's wiring diagram. On years 1992 and up, the ECU manages the sparks. A bad relay usually produce no spark on these models.

 

INSTALLATIONS

  1. Installation is the reverse of the procedure.
  2. It is not required to install into its original location. Move it to a cooler location. Eg., away form heat ducts or higher locations. And future troubleshooting would be far easier.


 

NEXT >>

Contact see author's rules. Last updated 11-1-04

 

 

Automotive Service Home     help
 
     2004. All rights reserved. Terms of Use   Advertise  Approved Privacy Statement