Fuel Pump Relay: Description and Operation

Engine Relay Location And Identification:

FUEL PUMP RELAY TERMINAL IDENTIFICATION
The following is a list of the terminal numbers, with circuit codes, and color codes, and their function:

Circuit No. Terminal No. Color Code Description

A05 30 RD Has battery input voltage supplied through fusible link.

A61 87 OR/BK Connected to terminal 30 in the energized position, supplies output voltage to fuel pump, EGR/EVAP solenoid, and fuel injectors.

K5 86 VT/WT Connected to the ignition relay (terminal 30), which provides input voltage to the relay.

A62 85 OR/GN Connected to the ECU, and grounded by the ECU when distributor signal is present.

N/A 87A N/A Not used in these applications.

Relay Terminal Identification:

The fuel pump relay is mounted on the left strut tower. The relay has voltage applied to it from the battery through the ignition switch at terminal 86. The ECU controls the relay by applying or taking away the ground from its circuit at terminal 85. When the ground is applied, the relay is energized, and battery voltage at terminal 30 is connected to terminal 87 which supplies voltage to the fuel pump, fuel injectors and EGR solenoid circuits. The ECU controls the fuel pump relay for safety purposes also. In the event that the vehicle stalls, and no tach signal is sent to the ECU it will not apply the ground to the relay, which prevents voltage from getting to the fuel pump, fuel injectors and EGR solenoid.