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Autopapyrus · Honda Civic (6th generation, EK) 1.4 D14A (1999)
https://autopapyrus.com/guides/honda/civic/fuel-pump-circuit-and-wire-colors/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Honda Civic (6th generation, EK) 1.4 D14A (1999): Fuel Pump Circuit and Wire Colors

The Civic EK fuel pump is powered through the PGM-FI main relay. The relay supplies +12 V to the pump, the injectors and the control unit, and the control signal to the pump runs through the green wire with a yellow stripe. Below you will find the circuit logic, component locations and the testing procedure. Verify wire colors against the actual connectors: they may differ between markets and trim levels.

Difficulty: Medium Time: 30-60 minutes (circuit check) Steps: 9

Parts

2
№PartGenuine part no.
01 PGM-FI main relay, Honda Civic EK 39794-SE0-003
39794-S04-003
02 Electric fuel pump assembly with in-tank moduleif faulty

Part numbers are from the manufacturer's original catalogue. Check them against your VIN before ordering.

Tools

5
  • multimeter
  • fused jumper wire
  • screwdriver set
  • 10 mm and 12 mm sockets
  • flashlight
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 31 more. See manuals →

Step by step

9 steps
  1. Circuit power supply. Positive runs from the battery through a fuse in the engine compartment, then through the ignition switch and a fuse in the interior fuse box to the PGM-FI main relay. The relay is located under the dash on the left side (in the direction of travel), next to the fuse box. The wires on the relay are mostly white/black and yellow/black. For the detailed connector colors, see the markings on the connector housing.
  2. Pump control wire. A green wire with a yellow stripe (GRN/YEL) runs from the main relay to the pump. This is the main "working" wire of the fuel pump. It should show +12 V when the ignition is turned on (for 2-3 seconds) and while the starter is cranking.
  3. Pump ground. The second wire of the pump connector is black (BLK). It goes to body ground near the rear floor or trunk. If the pump does not run but power is present, check this ground first: the terminal may be corroded or loose.
  4. Access to the pump connector. Look under the rear seat: the seat cushion lifts up, and beneath it there is an access panel in the floor above the tank. Remove the panel and disconnect the connector on the module cover. Do not touch the fuel line.
  5. Power check. Connect the multimeter at the connector (probes into the harness-side connector). Turn the ignition on: you should read 12 V between the green/yellow wire and ground. If there is no voltage, check the fuel pump fuse in the interior fuse box and the main relay.
  6. Ground check. Between the black wire and the battery negative terminal with the ignition on, you should read almost 0 V. If it is more than 0.3-0.5 V, the ground is poor.
  7. Main relay check. The relay clicks when the ignition is turned on. If there is no click or the pump does not hum, test the relay by swapping in a known good one, and inspect the solder joints on the relay board: on Hondas of this generation the solder joints often crack.
  8. Testing the pump directly. Apply 12 V through a 10-15 A fuse to the pump terminals (green/yellow is positive, black is negative) for a few seconds. If the pump runs, the fault is in the wiring harness or the relay. Do not run the pump without fuel.
  9. Reassembly. Install the connector until it clicks, then refit the access panel and the rear seat. No torque specifications are needed here: the access panel is held by clips and screws that need no force.

Common mistakes and warnings

  • Working on the fuel system is a fire hazard: disconnect the battery negative terminal, do not smoke, and keep sparks away from the tank
  • The fuel line is under pressure, so do not disconnect fuel lines without relieving the pressure first
  • The exact colors on the relay connector and the pin numbers on your particular car may differ (market, trim level, previous repairs)
  • Make sure the wires are not mixed up before applying power
  • If you have no experience with electrical and fuel systems, take the car to a repair shop